DOCSLIB.ORG

Ence of Pseudouridine (5-Ribosyluracil) and Uracil

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

Journal of Clinical Investigation Vol. 41, No. 7, 1962 THE METABOLISM OF RING-LABELED OROTIC ACID IN MAN By S. M. WEISSMAN, A. Z. EISEN, H. FALLON, M. LEWIS AND M. KARON (From the Metabolism Service, Dermatology and Medicine Branches, National Cancer Institute, Bethesda, Md.) (Submitted for publication January 19, 1962; accepted March 29, 1962) Considerable knowledge concerning purine me- Total plasma and urine radioactivity was determined by tabolism has been obtained from chemical and first digesting the plasma or urine with an equal vol of isotopic studies of urinary uric acid. Correspond- 5 N KOH for 2 hours at 70° C, decolorizing with 1 to 2 drops of hydrogen peroxide, and counting 0.2 ml of this ing information in man is lacking for the closely digest in 20 ml of the toluene-methanol solution (8). In related field of pyrimidine metabolism. The avail- all cases counting efficiency was determined by the addi- ability of ring-labeled orotic acid as a specific tion of internal standards. pyrimidine precursor (1), together with the pres- Alternatively, radioactivity of urine was determined by ence of pseudouridine (5-ribosyluracil) and uracil, plating serial dilutions of each urine specimen on stainless steel cups, and extrapolating the count rates to infinite as specific end products of pyrimidine metabolism thinness. After the first 8 days, the count rate in total in man, in conveniently assayable amounts in urine was generally too low to be conveniently determined human urine (2-4), makes it possible to conduct directly. Extrapolations of total urine radioactivity were certain kinetic studies. In the present investiga- based on the assumption that total urine radioactivity had tion the metabolism of ring-labeled orotic acid and a constant ratio to urinary pseudouridine activity, since such parallelism was observed in days 3 through 8. and the time course of isotope incorporation into uri- urinary pseudouridine constituted about one-third of total nary *pseudouridine and uracil were studied in urine radioactivity during this period. order to develop methods of measurement and Timed expiratory air samples were collected in rubber to obtain values for the whole-body rate of py- balloons. The carbon dioxide was trapped by bubbling rimidine synthesis as well as for the turnover rate the air through 0.5 N sodium hydroxide. Barium hy- droxide was added, barium carbonate collected by filtra- of certain ribonucleic acid fractions. tion, dried overnight at 1100 C, weighed, pulverized, and a weighed aliquot counted in a liquid scintillation counter METHODS AND EXPERIMENTAL PLAN after suspension in a thixotropic gel (9). Relative effi- ciency of this counting method had been previously deter- Uracil and pseudouridine were isolated from 15-minute mined in this laboratory (9). samples of urine by a previously described procedure Patients employed in this study were selected because employing column chromatography in a mixed borate- of the presence of an inoperable but slowly progressing chloride gradient (4). Specimens were concentrated and malignancy and normal hepatic and renal function. None desalted by absorption on alkaline DOW-1 formate and of the subjects lost any weight during the first 6 weeks elution with 0.1 N formic acid, when necessary for paper of the study. All subjects were maintained on a purine- chromatography or counting of low specific activity sam- free, 70-g protein, isocaloric diet for 5 days before and ples (5). Descending paper chromatography was per- at least 12 days after the orotic acid infusion. The selec- formed by standard techniques on Whatman no. 1 paper tion of this diet was made to simplify the urinary chro- with isopropanol:acetic acid:water (60:30:10) as the matogram and to limit the exogenous supply of pseudo- solvent (4). Serial 2 cm-strips were cut from the paper uridine and other pyrimidines. and eluted with water, and the radioactivity in the eluates Urine and expired-air samples were collected at pro- determined by counting at infinite thinness on stainless gressively increasing intervals during the first 2 days, steel cups in a low-background (less than 2 cpm) gas- daily thereafter for about 1.5 to 2 weeks, and once or flow counter. Pseudouridine and uracil specimens were twice weekly thereafter when possible, as indicated in counted in a liquid scintillation counter, after dissolving the graphs (Figures 1-4). in a dioxane-containing solvent (6). Appropriate stand- Patients I, II, and III received an intravenous infusion ards were counted in the same systems. of 50 ,uc of 6-C'4-, 2-C14-, and 2-C"-orotic acid (2 to 4 ,uc A fraction of urine containing orotic acid was separated per ,umole), respectively, over a period of 15 minutes. by DOW-1 formate column chromatography, by proce- Patient IV received 35 ,uc of 6-C14-orotic acid intrave- dures described elsewhere (7). This fraction was puri- nously over 90 minutes. Patient I had frequent plasma fied on paper chromatograms with methyl acetate:water: samples drawn over the first 3 hours for determination formic acid (65:35:5). The orotic acid was then eluted 4of radioactivity, in order to obtain an estimate of minimal with water and its specific activity determined. Irenal clearance rates for orotic acid. Simultaneous en- 1546 METABOLISM OF RING-LABELED OROTIC ACID IN MAN 1547 PATIENT I W9, AGE 50, COLON CARCINOMA WITH METASTASES 15C 120)o - 90)of 60 30 .- .- - Al - .A. ^ I- 1% en ^^ nNAa fn v 2 1 6 4 6 8 10 12 14 16 18 21 22 24 26 28 HOURS DAYS TIME FIG. 1. dogenous creatinine clearance was measured by standard RESULTS methods. Rat liver was examined for acid-soluble pseudouridine All radioactivity emerging from the borate col- compounds. Twelve g of liver was homogenized and umns in the uracil area migrated as uracil when treated with 0.5 N cold perchloric acid, centrifuged, and chromatographed on paper. After the first 2 the supernate neutralized with 2 N KOH. It was then hours, all radioactivity in the pseudouridine area treated with sufficient rattlesnake venom and bacterial alkaline phosphatase in 0.05 M Tris buffer, pH 8.0, to of the column chromatogram behaved like pseudo- convert nucleotide derivatives to nucleosides. The extract uridine on paper. The earliest urine specimens was processed by column chromatography in the same contained a radioactive compound, generally not manner as the urine samples. The eluates from the associated with detectable amounts of ultraviolet- uridine and pseudouridine areas of the chromatogram absorbing material, that emerged just ahead of were desalted and carefully examined for pseudouridine by paper chromatography. This was done also with the pseudouridine during column chromatography. liver of a rat previously given a total of 200 jtc of 2-C"- In order to get accurate pseudouridine specific orotic acid in six intraperitoneal doses over 24 hours. activities on these specimens, it was necessary, Both radioactive and ultraviolet-absorbing materials were prior to assay, to purify pseudouridine further by sought for and neither was found. The sensitivity of this approach is such that acid-soluble pseudouridine deriva- paper chromatography. tives corresponding to 1 part in 500 of the acid-soluble As shown in Figure 5, when the orotic acid was uridine derivatives would have been readily detected. administered over 15 minutes, the first few urine A pseudouridine standard was prepared from com- specimens had an excess of radioactivity, presum- mercial yeast ribonucleic acid by the methods of Cohn ably owing to spillage of orotic acid. In Patient I (10). All other chemicals, rattlesnake venom, and Escherichia coli alkaline phosphatase were commercial all detectable radioactivity had disappeared from products. the orotic acid-containing fraction of the appro- 1548 S. M. WEISSMAN, A. Z. EISEN, H. FALLON, M. LEWIS AND M. KARON PATIENT 1I W9,33, ADENOCARCINOMA STOMACH WITH METASTASES 800 400,2~ 200L 0 TIME FIG. 2. PATIENT m Wao.< 53, ADENOCARCINOMA COLON WITH METASTASES 4.8 3.6 01.24 I 1.L 1 II 22 24 26 28 30 32 34 HOURS TIl M E DAYS FIG. 3. METABOLISM OF RING-LABELED OROTIC ACID IN MAN 1549 priate column chromatogram by the end of 3 hours after administration of the isotope. Patient IV, who was given the orotic acid infusion more slowly (over a 90-minute period), did not show an early excess of radioactivity in her urine. The * PAT/ENTZf similarity of the general form of the specific activ- z ity curves in this and the other studies suggests 0 that the chemical amount of orotic acid given to OL PATIENT 39 I!Z WY, z ADENOCARCINOMA, 1ISITE UNKNOWN WITH METASTASES TO LUNGS 0 -J .05 1 2 3 4 5 6 HOUR S "L FIG. 5. TOTAL COUNTS EXCRETED IN URINE PER 15- MINUTE INTERVAL AFTER THE ADMINISTRATION OF ISO- TOPICALLY-LABELED OROTIC ACID. Observed counts not corrected for the 48 per cent efficiency of the counting instrument. rates for orotic acid. The recovered orotic acid from the urine in period U 1 (Table I) had a specific activity of 1,401,000 cpm per jumole, whereas the administered orotic acid had a specific TIME activity of 1,962,000 cpm per ptmole. Approx- FIG. 4. imately 1.3 pmoles (0.2 mg) of orotic acid was FIGS. 1-4. TIME COURSE OF SPECIFIC ACTIVITY OF URI- presumably produced endogenously and excreted NARY PSEUDOURIDINE AND URACIL AND OF RESPIRATORY during this 30-minute period. This would cor- CO2 AFTER THE ADMINISTRATION OF ISOTOPICALLY-LABELED OROTIC ACID. Upper graph ordinate: counts per minute TABLE I per tzmole urinary pseudouridine (X 10' but for Patient Patient I, minimal orotic acid clearances III, X 10'). Middle graph ordinate: counts per minute per ,/Amole urinary uracil (X 10').
Recommended publications
  • Investigation of Overhauser Effects Between Pseudouridine and Water Protons in RNA Helices

    Investigation of Overhauser Effects Between Pseudouridine and Water Protons in RNA Helices

    Investigation of Overhauser effects between pseudouridine and water protons in RNA helices Meredith I. Newby* and Nancy L. Greenbaum*†‡ *Department of Chemistry and Biochemistry and †Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306-4390 Communicated by Michael Kasha, Florida State University, Tallahassee, FL, August 8, 2002 (received for review July 2, 2002) The inherent chemical properties of RNA molecules are expanded by posttranscriptional modification of specific nucleotides. Pseudouridine (␺), the most abundant of the modified bases, features an additional imino group, NH1, as compared with uri- dine. When ␺ forms a Watson–Crick base pair with adenine in an RNA helix, NH1 is positioned within the major groove. The pres- ence of ␺ often increases thermal stability of the helix or loop in which it is found [Hall, K. B. & McLaughlin, L. (1992) Nucleic Acids Res. 20, 1883–1889]. X-ray crystal structures of transfer RNAs [e.g., Arnez, J. & Steitz, T. (1994) Biochemistry 33, 7560–7567] have depicted water molecules bridging ␺NH1 groups and nearby phos- phate oxygen atoms, but direct evidence for this interaction in solution has not been acquired. Toward this end, we have used a rotating-frame Overhauser effect spectroscopy-type NMR pulse sequence with a CLEAN chemical-exchange spectroscopy spin-lock pulse train [Hwang, T.-L., Mori, S., Shaka, A. J. & van Zijl, P. C. M. Fig. 1. Schematic structures of U and ␺ bases. R, ribose. The ␺ base is a uracil ␺ (1997) J. Am. Chem. Soc. 119, 6203–6204] to test for NH1–water rotated about the 3–6 ring axis, so that is has a COC base–sugar linkage and cross-relaxation effects within two RNA helices: (i) a complemen- an additional protonated ring nitrogen.
  • The Human Ortholog of Archaeal Pus10 Produces Pseudouridine 54 in Select Trnas Where Its Recognition Sequence Contains a Modified Residue

    The Human Ortholog of Archaeal Pus10 Produces Pseudouridine 54 in Select Trnas Where Its Recognition Sequence Contains a Modified Residue

    Downloaded from rnajournal.cshlp.org on October 7, 2021 - Published by Cold Spring Harbor Laboratory Press The human ortholog of archaeal Pus10 produces pseudouridine 54 in select tRNAs where its recognition sequence contains a modified residue MANISHA DEOGHARIA,1 SHAONI MUKHOPADHYAY, ARCHI JOARDAR,2 and RAMESH GUPTA Department of Biochemistry and Molecular Biology, Southern Illinois University, Carbondale, Illinois 62901-4413, USA ABSTRACT The nearly conserved U54 of tRNA is mostly converted to a version of ribothymidine (T) in Bacteria and eukaryotes and to a version of pseudouridine (Ψ) in Archaea. Conserved U55 is nearly always modified to Ψ55 in all organisms. Orthologs of TrmA and TruB that produce T54 and Ψ55, respectively, in Bacteria and eukaryotes are absent in Archaea. Pus10 produces both Ψ54 and Ψ55 in Archaea. Pus10 orthologs are found in nearly all sequenced archaeal and most eukaryal genomes, but not in yeast and bacteria. This coincides with the presence of Ψ54 in most archaeal tRNAs and some animal tRNAs, but its absence from yeast and bacteria. Moreover, Ψ54 is found in several tRNAs that function as primers for retroviral DNA syn- thesis. Previously, no eukaryotic tRNA Ψ54 synthase had been identified. We show here that human Pus10 can produce Ψ54 in select tRNAs, including tRNALys3, the primer for HIV reverse transcriptase. This synthase activity of Pus10 is restrict- ed to the cytoplasm and is distinct from nuclear Pus10, which is known to be involved in apoptosis. The sequence GUUCAm1AAUC (m1A is 1-methyladenosine) at position 53–61 of tRNA along with a stable acceptor stem results in max- imum Ψ54 synthase activity.
  • A Previously Undescribed Pathway for Pyrimidine Catabolism

    A Previously Undescribed Pathway for Pyrimidine Catabolism

    A previously undescribed pathway for pyrimidine catabolism Kevin D. Loh*†, Prasad Gyaneshwar*‡, Eirene Markenscoff Papadimitriou*§, Rebecca Fong*, Kwang-Seo Kim*, Rebecca Parales¶, Zhongrui Zhouʈ, William Inwood*, and Sydney Kustu*,** *Department of Plant and Microbial Biology, 111 Koshland Hall, University of California, Berkeley, CA 94720-3102; ¶Section of Microbiology, 1 Shields Avenue, University of California, Davis, CA 95616; and ʈCollege of Chemistry, 8 Lewis Hall, University of California, Berkeley, CA 94720-1460 Contributed by Sydney Kustu, January 19, 2006 The b1012 operon of Escherichia coli K-12, which is composed of tive N sources. Here we present evidence that the b1012 operon seven unidentified ORFs, is one of the most highly expressed codes for proteins that constitute a previously undescribed operons under control of nitrogen regulatory protein C. Examina- pathway for pyrimidine degradation and thereby confirm the tion of strains with lesions in this operon on Biolog Phenotype view of Simaga and Kos (8, 9) that E. coli K-12 does not use either MicroArray (PM3) plates and subsequent growth tests indicated of the known pathways. that they failed to use uridine or uracil as the sole nitrogen source and that the parental strain could use them at room temperature Results but not at 37°C. A strain carrying an ntrB(Con) mutation, which Behavior on Biolog Phenotype MicroArray Plates. We tested our elevates transcription of genes under nitrogen regulatory protein parental strain NCM3722 and strains with mini Tn5 insertions in C control, could also grow on thymidine as the sole nitrogen several genes of the b1012 operon on Biolog (Hayward, CA) source, whereas strains with lesions in the b1012 operon could not.
  • Pseudouridine Synthases Modify Human Pre-Mrna Co-Transcriptionally and Affect Splicing

    Pseudouridine Synthases Modify Human Pre-Mrna Co-Transcriptionally and Affect Splicing

    bioRxiv preprint doi: https://doi.org/10.1101/2020.08.29.273565; this version posted August 31, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. Pseudouridine synthases modify human pre-mRNA co-transcriptionally and affect splicing Authors: Nicole M. Martinez1, Amanda Su1, Julia K. Nussbacher2,3,4, Margaret C. Burns2,3,4, Cassandra Schaening5, Shashank Sathe2,3,4, Gene W. Yeo2,3,4* and Wendy V. Gilbert1* Authors and order TBD with final revision. Affiliations: 1Yale School of Medicine, Department of Molecular Biophysics & Biochemistry, New Haven, CT 06520, USA. 2Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92037, USA. 3Stem Cell Program, University of California, San Diego, La Jolla, CA 92037, USA. 4Institute for Genomic Medicine, University of California, San Diego, La Jolla, CA 92037, USA. 5Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02142, USA. *Correspondence to: [email protected], [email protected] Abstract: Eukaryotic messenger RNAs are extensively decorated with modified nucleotides and the resulting epitranscriptome plays important regulatory roles in cells 1. Pseudouridine (Ψ) is a modified nucleotide that is prevalent in human mRNAs and can be dynamically regulated 2–5. However, it is unclear when in their life cycle RNAs become pseudouridylated and what the endogenous functions of mRNA pseudouridylation are. To determine if pseudouridine is added co-transcriptionally, we conducted pseudouridine profiling 2 on chromatin-associated RNA to reveal thousands of intronic pseudouridines in nascent pre-mRNA at locations that are significantly associated with alternatively spliced exons, enriched near splice sites, and overlap hundreds of binding sites for regulatory RNA binding proteins.
  • A Dissertation Entitled Ribonucleic Acids in Disease Etiology and Drug Discovery by Immaculate Sappy Submitted to the Graduate F

    A Dissertation Entitled Ribonucleic Acids in Disease Etiology and Drug Discovery by Immaculate Sappy Submitted to the Graduate F

    A Dissertation entitled Ribonucleic Acids in Disease Etiology and Drug Discovery by Immaculate Sappy Submitted to the Graduate Faculty as partial fulfillment of the requirements for the Doctor of Philosophy Degree in Medicinal Chemistry ________________________________________ Amanda C. Bryant-Friedrich, Ph.D., Committee Chair ________________________________________ Zahoor A Shah, Ph.D., Committee Member ________________________________________ Steven M Peseckis, Ph.D., Committee Member ________________________________________ Caren Steinmiller, Ph.D., Committee Member ________________________________________ Amanda Bryant-Friedrich, PhD, Dean College of Graduate Studies The University of Toledo December 2019 Copyright 2019, Immaculate Sappy This document is copyrighted material. Under copyright law, no parts of this document may be reproduced without the expressed permission of the author. An Abstract of Ribonucleic Acids in Disease Etiology and Drug Discovery by Immaculate Sappy Submitted to the Graduate Faculty as partial fulfillment of the requirements for the Doctor of Philosophy Degree in Medicinal Chemistry The University of Toledo December 2019 Pseudouridine (Ψ), the 5-ribosyl isomer of uridine (U) is the most abundant nucleic acid modification found in all domains of life and all types of RNA. Studies have shown that, urinary levels of pseudouridine are higher in Alzheimer’s Disease (AD) patients and that RNA oxidation is a major component in the pathogenesis of Alzheimer’s Disease (AD) and other neurodegenerative disorders. Therefore, there is a potential correlation between higher urinary levels of pseudouridine in AD patients and oxidative stress. Hence, subjecting pseudouridine to oxidative conditions may provide some key information about the role of this nucleoside in RNA related processes and its role in disease etiology. Besides neurodegenerative disorders, antibiotic resistance is an additional threat to human health.
  • Non-Utilization of Radioactive Lodinated Uracil, Uridine, and Orotic Acid by Animal Tissues in Vivo W

    Non-Utilization of Radioactive Lodinated Uracil, Uridine, and Orotic Acid by Animal Tissues in Vivo W

    Non-utilization of Radioactive lodinated Uracil, Uridine, and Orotic Acid by Animal Tissues in Vivo W. H. PRUSOFF,WL. HOLMES,tANDA. D. WELCH Department of Pharmacology, School of Medicine, Western Reserve University, Cleveland, Ohio) Adenine (1, 6), guanine (1, 3, 5), cytidine (13), lometric localization of brain tumors. Further desoxycytidine (18), thymidine (18), and orotic more, an I'3-labeled oxazine dye had a significant acid (2), can be utilized by certain mammalian or effect in prolonging the life of mice bearing trans ganisms for the synthesis of nucleic acids ; and the planted tumors (19). If an effective and easily syn rate of incorporation of many of these compounds thesized radioactive iodine-labeled compound into the nucleic acids of rapidly growing tissues, could be found, the possibility might be afforded of such as regenerating liver or neoplastic tissues, is the comparable use of compounds labeled with greater than into those of resting tissues (10, 21). eka-iodine (astatine2@), a potent emitter of alpha Although 8-azaguanine is not a naturally occur particles, although this element is prepared with ring compound, evidence that it can be incorpo difficulty and has the inconveniently short half rated to a small extent into mammalian nucleic life of 7.5 hours (12). acids has been presented (16). This analog of gua Three P3-labeled pyrimidines, iodouridine-5- nine markedly inhibited the growth of Tetrahy I'S', iodouracil-5-I'31, and iodoorotic acid-5-P31, mena geleii, a guanine-requiring protozoan, and of were synthesized, and their incorporation into nor certain experimental tumors. Kidder et al.
  • Development, Uridine Diphosphate Glucose (UDPG), Pyrophosphorylase (EC 2.7.7.9)11 and Trehalose-6-Phosphate Synthetase (EC 2.3.1.15)

    Development, Uridine Diphosphate Glucose (UDPG), Pyrophosphorylase (EC 2.7.7.9)11 and Trehalose-6-Phosphate Synthetase (EC 2.3.1.15)

    PERIODS OF GENETIC TRANSCRIPTION REQUIRED FOR THE SYNTHESIS OF THREE ENZYMES DURING CELLULAR SLIME MOLD DEVELOPMENT* BY R. ROTH, t J. 1\I. ASHWORTH,4 AND M. SUSSMAN§ DEPARTMENT OF BIOLOGY, BRANDEIS UNIVERSITY, WALTHAM, MASSACHUSETTS Communicated by Sol Spiegelman, January 24, 1968 Various aspects of mRNA synthesis and stability have been examined in bacteria by permitting transcription to occur over a known, usually brief, period and then determining how much of a specific protein subsequently accumulates in the absence of further RNA synthesis. Thus, bacterial cells have been exposed to an inducer for very brief periods during which RNA synthesis could proceed normally and were then permitted to synthesize the enzyme de novo in the absence of both the inducer and further transcription. The latter restriction was ac- complished with base analogues,' uracil deprivation,2 actinomycin D,3 and by infection with lytic viruses.5 In an arginine- and uracil-requiring strain of E. coli infected with phage T6, protein and RNA synthesis were sequentially (and reversibly) restricted by successive precursor deprivations in order to study the accumulation of enzymes required for phage development.2 6 Under all of the above conditions, the amounts of enzymes synthesized were assumed to reflect in a simple fashion the over-all quantities and net concentrations of the correspond- irng mRNA species, and the subsequent decays of enzyme-forming capacity with time were assumed to reflect the manner in which the mRNA disappeared. This approach has also been exploited to investigate the transcriptive and translative events required for accumulation and disappearance of the enzyme uridine diphosphate galactose: polysaccharide transferase during slime mold development.
  • Nucleobases Thin Films Deposited on Nanostructured Transparent Conductive Electrodes for Optoelectronic Applications

    Nucleobases Thin Films Deposited on Nanostructured Transparent Conductive Electrodes for Optoelectronic Applications

    www.nature.com/scientificreports OPEN Nucleobases thin flms deposited on nanostructured transparent conductive electrodes for optoelectronic applications C. Breazu1*, M. Socol1, N. Preda1, O. Rasoga1, A. Costas1, G. Socol2, G. Petre1,3 & A. Stanculescu1* Environmentally-friendly bio-organic materials have become the centre of recent developments in organic electronics, while a suitable interfacial modifcation is a prerequisite for future applications. In the context of researches on low cost and biodegradable resource for optoelectronics applications, the infuence of a 2D nanostructured transparent conductive electrode on the morphological, structural, optical and electrical properties of nucleobases (adenine, guanine, cytosine, thymine and uracil) thin flms obtained by thermal evaporation was analysed. The 2D array of nanostructures has been developed in a polymeric layer on glass substrate using a high throughput and low cost technique, UV-Nanoimprint Lithography. The indium tin oxide electrode was grown on both nanostructured and fat substrate and the properties of the heterostructures built on these two types of electrodes were analysed by comparison. We report that the organic-electrode interface modifcation by nano- patterning afects both the optical (transmission and emission) properties by multiple refections on the walls of nanostructures and the electrical properties by the efect on the organic/electrode contact area and charge carrier pathway through electrodes. These results encourage the potential application of the nucleobases thin flms deposited on nanostructured conductive electrode in green optoelectronic devices. Te use of natural or nature-inspired materials in organic electronics is a dynamic emerging research feld which aims to replace the synthesized materials with natural (bio) ones in organic electronics1–3.
  • Increased Excretion of Modified Adenine Nucleosides by Children with Adenosine Dearninase Deficiency

    Increased Excretion of Modified Adenine Nucleosides by Children with Adenosine Dearninase Deficiency

    Pediatr. Res. 16: 362-369 (1982) Increased Excretion of Modified Adenine Nucleosides by Children with Adenosine Dearninase Deficiency ROCHELLE HIRSCHHORN,'"~ HOWARD RATECH, ARYE RUBINSTEIN, PHOTINI PAPAGEORGIOU, HERNANT KESARWALA, ERWIN GELFAND, AND VIVIEN ROEGNER-MANISCALCO Departments of Medicine and Pathology, New York University School of Medicine, New York, New York [R.H., H.R., and V.R.-M.];Department of Pediatrics, Albert Einstein College of Medicine, Bronx, New York [A.R.]; Department of Pediatrics, Rutgers University Medical ~chool,Piscataway, New Jersey [P.P., and H.K.]; and Department of Pediatrics, Hospital for Sick Children, Toronto, Ontario, Canada [E. G.] Summary tially in, and prevents proliferation of, irnmunocompetent cells, primarily of the T cell class (2, 5, 6, 23, 38, 49, 54). There is also We have identified seven adenine nucleosides in urines of un- in vivo and/or in vitro evidence for alternative mechanisms of treated adenosine deaminase (ADA) deficient patients, four of toxicity, which would operate via depletion of pyrimidine pools, which (adenosine, 2'-deoxyadenosine, 1-methyladenosine and N6- depletion of phosphoribosyl pyrophosphate and increases in cyclic methyladenosine) have been previously identified in urines of AMP or S-adenosyl homocysteine (16, 21, 24, 40, 46, 55). All of normals and/or ADA deficient patients. We confirm that ADA these mechanisms are dependent on accumulation of the substrates deficient patients excrete markedly increased amounts of 2'-deox- of ADA, adenosine and 2'-deoxyadenosine. yadenosine (582 k 363 versus normal of < 0.1 nmoles/mg creati- In addition to adenosine and 2'-deoxyadenosine, several other nine) and increased amounts of adenosine (29.4 & 5.7 versus modified adenine nucleosides occur naturally (17, 19) and are normal of 4.12 & 1.0 nmoles/mg creatinine).
  • N4-Acetylcytidine and 5-Formylcytidine Are Present in Saccharomyces Cerevisiae Mrnas

    N4-Acetylcytidine and 5-Formylcytidine Are Present in Saccharomyces Cerevisiae Mrnas

    bioRxiv preprint doi: https://doi.org/10.1101/327585; this version posted May 21, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. N4-acetylcytidine and 5-formylcytidine are present in Saccharomyces cerevisiae mRNAs Mehmet Tardu1, Qishan Lin2, and Kristin S. Koutmou1* 1University of Michigan, Department of Chemistry, 930 N University, Ann Arbor, MI 48109, (734) 764-5650, [email protected], 2Mass Spectrometry Consortium for Epitranscriptomics, University at Albany, 1400 Washington Ave, Albany, NY 12222. Abstract Chemical modifications of RNAs have long been appreciated as key modulators of non-coding RNA structure and function. There is an emerging realization that chemical modification of protein-coding mRNAs also plays critical roles in the cell. Nonetheless, of the over 100 known RNA modifications found in biology only a handful have been identified in mRNAs. Here we use an ultra-high performance liquid chromatography- tandem mass spectrometry (UHPLC-MS/MS) method to identify and quantify modifications present in mRNAs of yeast cells. We detect the presence of four modified nucleosides in mRNAs at relatively high abundances: N7-methylguanosine, N6- methyladenosine, N4-acetylcytidine and 5-formylcytidine. Additionally, we investigate how the levels of mRNA modifications change in response to cellular stress. We find that the concentrations of nine mRNA modifications including N6-methyladenosine and N4- acetylcytidine change in response to heat stress, glucose starvation and/or oxidative stress. Our findings suggest that mRNA modification may provide a potential mechanism for cells to rapidly respond to environmental stressors.
  • Extraterrestrial Nucleobases in the Murchison Meteorite

    Extraterrestrial Nucleobases in the Murchison Meteorite

    Extraterrestrial nucleobases in the Murchison meteorite Zita Martins a,b*, Oliver Botta c,d,1, Marilyn L. Fogel e, Mark A. Sephton b, Daniel P. Glavin c, Jonathan S. Watson f, Jason P. Dworkin c, Alan W. Schwartz g & Pascale Ehrenfreund a,c aAstrobiology Laboratory, Leiden Institute of Chemistry, 2300 RA Leiden, The Netherlands bDepartment of Earth Science and Engineering, Imperial College, London, SW7 2AZ, UK cNASA Goddard Space Flight Center, Code 699, Greenbelt, MD 20771, USA dGoddard Earth Sciences and Technology Center, University of Maryland Baltimore County, Baltimore, MD 21228, USA eGL, Carnegie Institution of Washington, Washington, DC 20015, USA fPlanetary and Space Sciences Research Institute, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK gRadboud University Nijmegen, 6525 ED, Nijmegen,The Netherlands 1Now at International Space Science Institute, Hallerstrasse 6, 3012 Bern, Switzerland. *Corresponding author: Zita Martins. Current address: Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK. Tel: +442075949982. Fax: +442075947444. Email: [email protected] To appear in Earth and Planetary Science Letters 270, 130-136. 15 June 2008 1 Abstract Carbon-rich meteorites, carbonaceous chondrites, contain many biologically relevant organic molecules and delivered prebiotic material to the young Earth. We present compound-specific carbon isotope data indicating that measured purine and pyrimidine compounds are indigenous components of the Murchison meteorite. Carbon isotope ratios for uracil and xanthine of δ13 C = +44.5‰ and +37.7‰, respectively, indicate a non-terrestrial origin for these compounds. These new results demonstrate that organic compounds, which are components of the genetic code in modern biochemistry, were already present in the early solar system and may have played a key role in life’s origin.
  • Modified Nucleosides, Nucleotides, and Nucleic

    Modified Nucleosides, Nucleotides, and Nucleic

    (19) TZZ ¥Z__T (11) EP 2 763 701 B1 (12) EUROPEAN PATENT SPECIFICATION (45) Date of publication and mention (51) Int Cl.: of the grant of the patent: A61K 48/00 (2006.01) C07H 21/02 (2006.01) 19.12.2018 Bulletin 2018/51 C07H 21/04 (2006.01) (21) Application number: 12838676.0 (86) International application number: PCT/US2012/058519 (22) Date of filing: 03.10.2012 (87) International publication number: WO 2013/052523 (11.04.2013 Gazette 2013/15) (54) MODIFIED NUCLEOSIDES, NUCLEOTIDES, AND NUCLEIC ACIDS, AND USES THEREOF MODIFIZIERTE NUKLEOSIDE, NUKLEOTIDE UND NUKLEINSÄUREN UND VERWENDUNGEN DAVON NUCLÉOSIDES, NUCLÉOTIDES ET ACIDES NUCLÉIQUES MODIFIÉS, ET LEURS UTILISATIONS (84) Designated Contracting States: (74) Representative: Hoffmann Eitle AL AT BE BG CH CY CZ DE DK EE ES FI FR GB Patent- und Rechtsanwälte PartmbB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO Arabellastraße 30 PL PT RO RS SE SI SK SM TR 81925 München (DE) Designated Extension States: BA ME (56) References cited: WO-A2-2011/012316 US-A1- 2010 047 261 (30) Priority: 03.10.2011 US 201161542533 P US-A1- 2011 143 397 US-A1- 2012 251 618 (43) Date of publication of application: • KARIKÓ KATALIN ET AL: "Incorporation of 13.08.2014 Bulletin 2014/33 pseudouridine into mRNA yields superior nonimmunogenic vector with increased (73) Proprietor: Moderna Therapeutics, Inc. translational capacity and biological stability", Cambridge, Massachusetts 02141 (US) MOLECULAR THERAPY, NATURE PUBLISHING GROUP, GB, vol. 16, no. 11, 1 November 2008 (72) Inventors: (2008-11-01), pages 1833-1840, XP002598556, • DE FOUGEROLLES, Antonin ISSN: 1525-0024, DOI: 10.1038/MT.2008.200 Brookline, MA 02446 (US) [retrieved on 2008-09-16] •ROY,Atanu • LUIGI WARREN ET AL: "Highly efficient Stoneham, MA 02180 (US) reprogramming to pluripotency and directed • SCHRUM, Jason P.