Table S1. the Comparison of Vb Ospm OC Phage-Encoded Proteins with T4 and T4-Like Phages Using Protein BLAST (1E-5 E-Value Threshold)
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Characterization and evolution of artificial RNA ligases A DISSERTATION SUBMITTED TO THE FACULTY OF THE GRADUATE SCHOOL OF THE UNIVERSITY OF MINNESOTA BY Aleardo Morelli IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY Adviser: Burckhard Seelig June 2015 © Aleardo Morelli, 2015 Abstract Enzymes enable biocatalysis with minimal by-products, high regio- and enantioselectivity, and can operate under mild conditions. These properties facilitate numerous applications of enzymes in both industry and research. Great progress has been made in protein engineering to modify properties such as stability and catalytic activity of an enzyme to suit specific processes. On the contrary, the generation of artificial enzymes de novo is still challenging, and only few examples have been reported. The study and characterization of artificial enzymes will not only expand our knowledge of protein chemistry and catalysis, but ultimately improve our ability to generate novel biocatalysts and engineer those found in nature. My thesis focused on the characterization of an artificial RNA ligase previously selected from a library of polypeptide variants based on a non-catalytic protein scaffold. The selection employed mRNA display, a technique to isolate de novo enzymes in vitro from large libraries of 1013 protein variants. The artificial RNA ligase catalyzes the formation of a phosphodiester bond between two RNA substrates by joining a 5'- triphospate to a 3'-hydroxyl, with the release of pyrophosphate. This activity has not been observed in nature. An initial selection carried out at 23°C yielded variants that were poorly suitable for biochemical and biophysical characterization due do their low solubility and poor folding. -
<I>Lactobacillus Reuteri</I>
University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Faculty Publications in Food Science and Food Science and Technology Department Technology 2014 From prediction to function using evolutionary genomics: Human-specific ecotypes of Lactobacillus reuteri have diverse probiotic functions Jennifer K. Spinler Texas Children’s Hospital, [email protected] Amrita Sontakke Baylor College of Medicine Emily B. Hollister Baylor College of Medicine Susan F. Venable Baylor College of Medicine Phaik Lyn Oh University of Nebraska, Lincoln See next page for additional authors Follow this and additional works at: http://digitalcommons.unl.edu/foodsciefacpub Spinler, Jennifer K.; Sontakke, Amrita; Hollister, Emily B.; Venable, Susan F.; Oh, Phaik Lyn; Balderas, Miriam A.; Saulnier, Delphine M.A.; Mistretta, Toni-Ann; Devaraj, Sridevi; Walter, Jens; Versalovic, James; and Highlander, Sarah K., "From prediction to function using evolutionary genomics: Human-specific ce otypes of Lactobacillus reuteri have diverse probiotic functions" (2014). Faculty Publications in Food Science and Technology. 132. http://digitalcommons.unl.edu/foodsciefacpub/132 This Article is brought to you for free and open access by the Food Science and Technology Department at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Faculty Publications in Food Science and Technology by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Authors Jennifer K. Spinler, Amrita Sontakke, Emily B. Hollister, -
The Requirement for Cobalt in Vitamin B12: a Paradigm for ☆ Protein Metalation
BBA - Molecular Cell Research 1868 (2021) 118896 Contents lists available at ScienceDirect BBA - Molecular Cell Research journal homepage: www.elsevier.com/locate/bbamcr Review The requirement for cobalt in vitamin B12: A paradigm for ☆ protein metalation Deenah Osman a,b, Anastasia Cooke c, Tessa R. Young a,b, Evelyne Deery c, Nigel J. Robinson a,b,*, Martin J. Warren c,d,e,** a Department of Biosciences, Durham University, Durham DH1 3LE, UK b Department of Chemistry, Durham University, Durham DH1 3LE, UK c School of Biosciences, University of Kent, Canterbury, Kent CT2 7NJ, UK d Quadram Institute Bioscience, Norwich Research Park, Norwich NR4 7UQ, UK e Biomedical Research Centre, University of East Anglia, Norwich NR4 7TJ, UK ARTICLE INFO ABSTRACT Keywords: Vitamin B12, cobalamin, is a cobalt-containing ring-contracted modified tetrapyrrole that represents one of the Cobalamin most complex small molecules made by nature. In prokaryotes it is utilised as a cofactor, coenzyme, light sensor Cobamide and gene regulator yet has a restricted role in assisting only two enzymes within specific eukaryotes including Metals mammals. This deployment disparity is reflected in another unique attribute of vitamin B12 in that its biosyn Chelation thesis is limited to only certain prokaryotes, with synthesisers pivotal in establishing mutualistic microbial Homeostasis sensors communities. The core component of cobalamin is the corrin macrocycle that acts as the main ligand for the cobalt. Within this review we investigate why cobalt is paired specifically with the corrin ring, how cobalt is inserted during the biosynthetic process, how cobalt is made available within the cell and explore the cellular control of cobalt and cobalamin levels. -
Supplementary Information Genomice and Transcriptomic Analysis
Supplementary Information Genomice and Transcriptomic Analysis for Identification of Genes and Interlinked Pathways Mediating Artemisinin Resistance in Leishmania donovani Sushmita Ghosh1,2, Aditya Verma1, Vinay Kumar1, Dibyabhaba Pradhan3, Angamuthu Selvapandiyan 2, Poonam Salotra1, Ruchi Singh1* 1. ICMR- National Institute of Pathology, Safdarjung Hospital Campus, New Delhi-110029, India 2. Jamia Hamdard University-Institute of Molecular Medicine, New Delhi-110062, India 3. ICMR-AIIMS Computational Genomics Centre, Indian Council of Medical Research, New Delhi- 110029 *Correspondence: [email protected] Supplementary Figures and Tables: Figure S1. Figure S1: Comparative transcriptional responses following ART adaptation in L. donovani. Overlap of log2 transformed K133 AS-R and K133 WT expression ratio plotted as a function of chromosomal location of probes representing the full genome microarray. The plot represents the average values of three independent hybridizations for each isolate. Table S1: List of genes validated for their modulated expression by Quantitative real time- PCR S.N Primer Gene Name/ Function/relevance Primer Sequence o. Name Gene ID 1 AQP1 Aquaglyceropor Metal ion F- in (LinJ.31.0030) transmembrane 5’CAGGGACAGCTCGAGGGTAA transporter activity, AA3’ integral to membrane; transmembrane R- transport; transporter 5’GTTACCGGCGTGAAAGACAG activity; water TG3’ transport. 2 A2 A2 protein Cellular response to F- (LinJ.22.0670) stress 5’GTTGGCCCGCTTTCTGTTGG3’ R- 5’ACCAACGTCAACAGAGAGA GGG3’ 3 ABCG1 ATP-binding ATP binding, ATPase -
T4 RNA Ligase Catalyzes the Synthesis of Dinucleoside Polyphosphates
Eur. J. Biochem. 261, 802±811 (1999) q FEBS 1999 T4 RNA ligase catalyzes the synthesis of dinucleoside polyphosphates Eva Ana Atencia, Olga Madrid, MarõÂaA.GuÈnther Sillero and Antonio Sillero Instituto de Investigaciones BiomeÂdicas Alberto Sols, UAM/CSIC, Departamento de BioquõÂmica, Facultad de Medicina, Madrid, Spain T4 RNA ligase has been shown to synthesize nucleoside and dinucleoside 50-polyphosphates by displacement of the AMP from the E-AMP complex with polyphosphates and nucleoside diphosphates and triphosphates. Displacement of the AMP by tripolyphosphate (P3) was concentration dependent, as measured by SDS/PAGE. When the enzyme 32 was incubated in the presence of 0.02 mm [a- P] ATP, synthesis of labeled Ap4A was observed: ATP was acting as both donor (Km, mm) and acceptor (Km,mm) of AMP from the enzyme. Whereas, as previously known, ATP or dATP (but not other nucleotides) were able to form the E-AMP complex, the specificity of a compound to be acceptor of AMP from the E-AMP complex was very broad, and with Km values between 1 and 2 mm. In the presence of a low concentration (0.02 mm)of[a-32P] ATP (enough to form the E-AMP complex, but only marginally enough to form Ap4A) and 4 mm of the indicated nucleotides or P3, the relative rate of synthesis of the following radioactive (di)nucleotides was observed: Ap4X (from XTP, 100); Ap4dG (from dGTP, 74); Ap4G (from GTP, 49); Ap4dC (from dCTP, 23); Ap4C (from CTP, 9); Ap3A (from ADP, 5); Ap4ddA, (from ddATP, 1); p4A (from P3, 200). The enzyme also synthesized efficiently Ap3A in the presence of 1 mm ATP and 2 mm ADP. -
RNA Ligase Structures Reveal the Basis for RNA Specificity And
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Elsevier - Publisher Connector RNA Ligase Structures Reveal the Basis for RNA Specificity and Conformational Changes that Drive Ligation Forward Jayakrishnan Nandakumar,1,2,3 Stewart Shuman,2 and Christopher D. Lima1,* 1 Structural Biology Program 2 Molecular Biology Program 3 Training Program in Chemical Biology Sloan-Kettering Institute, New York, NY 10021, USA *Contact: [email protected] DOI 10.1016/j.cell.2006.08.038 0 SUMMARY 5 PO4 strand is DNA or RNA (Nandakumar and Shuman, 2004). Thus, ligase specificity might be dictated by dis- T4 RNA ligase 2 (Rnl2) and kinetoplastid RNA crimination of A form and B form secondary structures in 0 0 editing ligases exemplify a family of RNA repair duplex nucleic acid on either the 3 OH or 5 PO4 sides of 0 0 enzymes that seal 3 OH/5 PO4 nicks in duplex a nick. This model is difficult to extend to RNA ligases RNAs via ligase adenylylation (step 1), AMP that join single-stranded polynucleotide ends. 0 Two families of RNA ligases, named Rnl1 and Rnl2, transfer to the nick 5 PO4 (step 2), and attack by the nick 30OH on the 50-adenylylated strand function in the repair of ‘‘purposeful’’ RNA breaks. The Rnl1 family includes bacteriophage T4 RNA ligase 1 (Silber to form a phosphodiester (step 3). Crystal struc- et al., 1972; Uhlenbeck and Gumport, 1982; Wang et al., tures are reported for Rnl2 at discrete steps 2003) and tRNA ligases of fungi and plants (Wang and along this pathway: the covalent Rnl2-AMP Shuman, 2005; Englert and Beier, 2005). -
Comparative Genomics Analysis of Translational Frameshifting in Aerobic Cobalt Chelatase Genes
Comparative genomics analysis of translational frameshifting in aerobic cobalt chelatase genes Ivan Antonov Institute of Bioengineering, Research Centre of Biotechnology, RAS, Moscow, Russia, [email protected] Maria Zamkova Russian N.N.Blokhin Cancer Research Center, Moscow, Russia, [email protected] Cobalt chelatase CobNST is one of about 25 enzymes required for aerobic biosynthesis of cobalamin (vitamin B12) in prokaryotes. It has been shown that the large, medium and small subunits of this enzyme are encoded by the cobN, cobT and cobS genes, respectively [1]. A later computational study has revealed a number of prokaryotic genomes where the cobT and cobS genes are missing from the cobalamin biosynthesis pathway. Instead these genomes contain the chlD and chlI genes encoding the medium and small subunits of the magnesium chelatase chlIDH - the enzyme required for chlorophyll biosynthesis. Given the high similarity between the magnesium and cobalt chelatases, the authors have hypothesized that the products of the chlD and chlI genes can replace the missing subunits of the cobNST enzyme. Recently, we have discovered a functional programmed ribosomal frameshifting (PRF) signal located inside the cobT gene from diverse bacteria and archea that efficiently diverts translation to the -1 reading frame [3]. The goal of the present study is to determine the possible biological function of this conserved recoding event. For this purpose we performed a comparative genomics analysis of the PRF-utilization by the cobalt and magnesium chelatase genes from more than 1200 prokaryotic genomes. In total, there were 135 and 36 cobT genes with putative -1 and +1 frameshifting, respectively. Given the high similarity between the CobS protein and the N-terminal part of the CobT protein, we hypothesized that translational frameshifting may allow cobT mRNA to produce two cobaltochelatase subunits. -
Two Distinct Roles for Two Functional Cobaltochelatases (Cbik) in Desulfovibrio Vulgaris Hildenborough† Susana A
Biochemistry 2008, 47, 5851–5857 5851 Two Distinct Roles for Two Functional Cobaltochelatases (CbiK) in DesulfoVibrio Vulgaris Hildenborough† Susana A. L. Lobo,‡ Amanda A. Brindley,§ Ce´lia V. Roma˜o,‡ Helen K. Leech,§ Martin J. Warren,§ and Lı´gia M. Saraiva*,‡ Instituto de Tecnologia Quı´mica e Biolo´gica, UniVersidade NoVa de Lisboa, AVenida da Republica (EAN), 2780-157 Oeiras, Portugal, and Protein Science Group, Department of Biosciences, UniVersity of Kent, Canterbury, Kent CT2 7NJ, United Kingdom ReceiVed February 28, 2008; ReVised Manuscript ReceiVed March 28, 2008 ABSTRACT: The sulfate-reducing bacterium DesulfoVibrio Vulgaris Hildenborough possesses a large number of porphyrin-containing proteins whose biosynthesis is poorly characterized. In this work, we have studied two putative CbiK cobaltochelatases present in the genome of D. Vulgaris. The assays revealed that both enzymes insert cobalt and iron into sirohydrochlorin, with specific activities with iron lower than that measured with cobalt. Nevertheless, the two D. Vulgaris chelatases complement an E. coli cysG mutant strain showing that, in ViVo, they are able to load iron into sirohydrochlorin. The results showed that the functional cobaltochelatases have distinct roles with one, CbiKC, likely to be the enzyme associated with cytoplasmic cobalamin biosynthesis, while the other, CbiKP, is periplasmic located and possibly associated with an iron transport system. Finally, the ability of D. Vulgaris to produce vitamin B12 was also demonstrated in this work. Modified tetrapyrroles such as hemes, siroheme, and constituted by only around 110-145 amino acids, the short S cobalamin (vitamin B12) are characterized by a large mo- form (CbiX ). The N-terminal and C-terminal domains of lecular ring structure with a centrally chelated metal ion. -
Systematic Evaluation and Optimization of the Experimental
www.nature.com/scientificreports Corrected: Author Correction OPEN Systematic evaluation and optimization of the experimental steps in RNA G-quadruplex Received: 11 December 2018 Accepted: 20 May 2019 structure sequencing Published online: 30 May 2019 Pui Yan Yeung 1, Jieyu Zhao 1, Eugene Yui-Ching Chow 2, Xi Mou 1, HuiQi Hong3,4, Leilei Chen 4,5, Ting-Fung Chan 2 & Chun Kit Kwok 1 cDNA library preparation is important for many high-throughput sequencing applications, such as RNA G-quadruplex structure sequencing (rG4-seq). A systematic evaluation of the procedures of the experimental pipeline, however, is lacking. Herein, we perform a comprehensive assessment of the 5 key experimental steps involved in the cDNA library preparation of rG4-seq, and identify better reaction conditions and/or enzymes to carry out each of these key steps. Notably, we apply the improved methods to fragmented cellular RNA, and show reduced RNA input requirement, lower transcript abundance variations between biological replicates, as well as lower transcript coverage bias when compared to prior arts. In addition, the time to perform these steps is substantially reduced to hours. Our method and results can be directly applied in protocols that require cDNA library preparation, and provide insights to the further development of simple and efcient cDNA library preparation for diferent biological applications. Multitudes of cDNA library preparation methods have been developed as a result of the recent exploration and investigation of the novel features of RNA, such as RNA structures1–4. However, most of these methods require high RNA input (microgram of RNA), numerous processing and purifcation steps, and thus long cDNA library preparation time (few days)5–9. -
Isolation of a Ribozyme with 5'-5' Ligase Activity
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Elsevier - Publisher Connector Isolation of a ribozyme with 5’-5’ ligase activity Karen B Chapman+ and Jack W Szostak* Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114, USA Background: Many new ribozymes, including sequ- linkage. Deletion analysis of one of the selected ence-specific nucleases, ligases and kinases, have been sequences revealed that a 54-nucleotide RNA retained isolated by in vitro selection from large pools of random- activity; this small ribozyme folds into a pseudoknot sec- sequence RNAs.We are attempting to use in vitro selec- ondary structure with an internal binding site for the tion to isolate new ribozymes that have, or can be substrate oligonucleotide.The ribozyme can also synthe- evolved to have, RNA polymerase-like activities. As size 5’-5’ triphosphate and 5’-5’ pyrophosphate linkages. phosphorimidazolide-activated nucleosides are exten- Conclusions: The emergence of ribozymes that acceler- sively used to study non-enzymatic RNA replication, we ate an unexpected 5’-5’ ligation reaction from a selection wished to select for a ribozyme that would accelerate the designed to yield template-dependent 3’-5’ ligases template-directed ligation of 5’-phosphorimidazolide- suggests that it may be much easier for RNA to catalyze activated oligonucleotides. the synthesis of 5’-5’ linkages than 3’-5’ linkages. 5’-5’ Results: Ribozymes selected to perform the desired linkages are found in a variety of contexts in present-day template-directed ligation reaction instead ligated them- biology. The ribozyme-catalyzed synthesis of such selves to the activated substrate oligonucleotide via their linkages raises the possibility that these 5’-5’ linkages 5’-triphosphate, generating a 5’-5’ P’,P4-tetraphosphate originated in the biochemistry of the RNA world. -
T4 RNA Ligase 2 Catalyzes Phosphodiester Bond Formation Between a 5’ Phosphate T4 RNA Ligase 2 and 3’ Hydroxyl of RNA
Product Specifications L6080L Rev B Product Information Product Description: T4 RNA Ligase 2 catalyzes phosphodiester bond formation between a 5’ phosphate T4 RNA Ligase 2 and 3’ hydroxyl of RNA. The preferred substrate is nicked double-stranded RNA but single-stranded RNA can also Part Number L6080L serve as a substrate. Ligation of single-stranded RNA substrates generates either intramolecular or Concentration 30,000 U/mL intermolecular products. Besides nicked double-stranded Unit Size 4,500 U RNA substrates, other nicked nucleic acids hybrids can be sealed. The strand containing the 5’ phosphate can either Storage Temperature -25⁰C to -15⁰C be DNA or RNA. The non-ligated strand of the duplex can be either RNA or DNA. T4 RNA ligase 2 requires ATP for activity unless the substrate is preadenylated on the 5’ end. A truncated version of T4 RNA ligase 2 is a better enzyme for preadenylated substrates because it generates less side- reaction ligation products than the full length enzyme. Product Specifications L6080 SDS Specific SS DS DS E. coli DNA Non-specific Assay Purity Activity Exonuclease Exonuclease Endonuclease Contamination RNAse Units Tested n/a n/a 500 500 500 500 500 >120,000 <5.0% <1.0% No detectable non- Specification >99% No Conversion <10 copies U/mg Released Released specific RNAse Source of Protein: Purified from a strain of E. coli that expresses the recombinant T4 RNA Ligase 2 gene. Unit Definition: 1 unit is defined as the amount of enzyme required to ligate 50% of 0.4 µg of an equimolar mix of a single- stranded 5’ FAM-labeled 17-mer RNA to the 5’ phosphorylated end of a 18-mer DNA when both strands are annealed to a complementary 35-mer DNA strand in 20 µL at 37⁰C for 30 minutes. -
Evolution and Evaluation of Engineered Dnaligases For
EVOLUTION AND EVALUATION OF ENGINEERED DNA LIGASES FOR IMPROVED BLUNT-END LIGATION BY Janine Kelly Sharma 2020 A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN CELL AND MOLECULAR BIOSCIENCE Abstract DNA ligases are fundamental enzymes in molecular biology and biotechnology where they perform essential reactions, e.g. to create recombinant DNA and for adaptor attachment in next-generation sequencing. T4 DNA ligase is the most widely used commercial ligase owing to its ability to catalyse ligation of blunt-ended DNA termini. However, even for T4 DNA ligase, blunt-end ligation is an inefficient activity compared to cohesive-end ligation, or its evolved activity of sealing single-strand nicks in double-stranded DNA. Previous research from Dr Wayne Patrick showed that fusion of T4 DNA ligase to a DNA-binding domain increases the enzyme’s affinity for DNA substrates, resulting in improved ligation efficiency. It was further shown that changes to the linker region between the ligase and DNA-binding domain resulted in altered ligation activity. To assist in optimising this relationship, we designed a competitive ligase selection protocol to enrich for engineered ligase variants with greater blunt-end ligation activity. This selection involves expressing a DNA ligase from its plasmid construct, and ligating a linear form of its plasmid, sealing a double-strand DNA break in the chloramphenicol resistance gene, permitting bacterial growth. Previous researcher Dr Katherine Robins created two linker libraries of 33 and 37 variants, from lead candidate ligase-cTF and (the less active form of p50-ligase variant) ligase-p50, respectively.