Genomic Recombination Leading to Decreased Virulence of Group B Streptococcus in a Mouse Model of Adult Invasive Disease
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Specific Binding of Transposase to Terminal Inverted Repeats Of
Proc. Natl. Acad. Sci. USA Vol. 84, pp. 8220-8224, December 1987 Biochemistry Specific binding of transposase to terminal inverted repeats of transposable element Tn3 (transposon/DNA binding protein/DNase I "footprinting") HITOSHI ICHIKAWA*, KAORU IKEDA*, WILLIAM L. WISHARTt, AND EIICHI OHTSUBO*t *Institute of Applied Microbiology, University of Tokyo, Bunkyo-ku, Yayoi 1-1-1, Tokyo 113, Japan; and tDepartment of Molecular Biology, Princeton University, Princeton, NJ 08544 Communicated by Norman Davidson, July 27, 1987 ABSTRACT Tn3 transposase, which is required for trans- containing the Tn3 terminal regions when 8 mM ATP is position of Tn3, has been purified by a low-ionic-strength- present (14). precipitation method. Using a nitrocellulose filter binding In this paper, we study the interaction of Tn3 transposase, assay, we have shown that transposase binds to any restriction which has been purified by a low-ionic-strength-precipitation fragment. However, binding of the transposase to specific method, with DNA. We demonstrate that the purified fragments containing the terminal inverted repeat sequences of transposase is an ATP-independent DNA binding protein, Tn3 can be demonstrated by treatment of transposase-DNA which has interesting properties that may be involved in the complexes with heparin, which effectively removes the actual transposition event of Tn3. transposase bound to the other nonspecific fragments at pH 5-6. DNase I "footprinting" analysis showed that the MATERIALS AND METHODS transposase protects an inner 25-base-pair region of the 38- base-pair terminal inverted repeat sequence of Tn3. This Bacterial Strains and Plasmids. The bacterial strains used protection is not dependent on pH. -
Ribonuclease A: Disulfide Bonds, Conformational Stability, and Cytotoxicity
Ribonuclease A: Disulfide Bonds, Conformational Stability, and Cytotoxicity by Tony A. Klink A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy (Biochemistry) at the UNIVERSITY OF WISCONSIN-MADISON 2()()() r OJ A dissertation entitled Ribonuclease A: Disulfide Bonds, Conformational Stability and Cytotoxicity submitted to the Graduate School of the University of Wisconsin-Madison in partial fulfillment of the requirements for the degree of Doctor of Philosophy by Tony Anthony Klink Date of Final Oral Examination: August 4, 2000 Month & Year Degree to be awarded: December May August 2000 • * * * * * * • * * • * • • • • • * • • • * • • • • • • • • • • • • • * * • * • * * * • * • * • • • • • • * App oval Signature. f Dissertation Readers: Signature, Dean of Graduate School ---..., v.C~vJ,1A. 5. lJ,~k;at 1 Abstract Disulfide bonds between the side chains of cysteine residues are the only common cross links in proteins. Bovine pancreatic ribonuclease A (RNase A) is a 124-residue enzyme that contains four interweaving disulfide bonds (Cys26-Cys84, Cys40-Cys95, Cys58-CysllO, and Cys65-Cys72) and catalyzes the cleavage of RNA. The contribution of each disulfide bond to the confonnational stability and catalytic activity of RNase A was detennined using variants in which each cystine was replaced independently with a pair of alanine residues. Of the four disulfide bonds, the Cys40-Cys95 and Cys65-Cys72 cross-links are the least important to confonnational stability. Removing these disulfide bonds leads to RNase A variants that have Tm values below that of the wild-type enzyme but above physiological temperature. Unlike wild-type RNase A. G88R RNase A is toxic to cancer cells. To investigate the relationship between conformational stability and cytotoxicity, the C40AlC95A and C65A1C72A variants were made in the G88R background. -
Determination of Pk, Values of the Histidine Side
Protein Science (1997), 6:1937-1944. Cambridge University Press. Printed in the USA Copyright 0 1997 The Protein Society Determination of pK, values of the histidine side chains of phosphatidylinositol-specific phospholipase C from Bacillus cereus by NMR spectroscopy and site-directed mutagenesis TUN LIU, MARGRET RYAN, FREDERICK W. DAHLQUIST, AND 0. HAYES GRIFFITH Institute of Molecular Biology and Department of Chemistry, University of Oregon, Eugene, Oregon 97403 (RECEIVEDDecember 4, 1996: ACCEPTEDMay 19, 1997) Abstract Two active site histidine residues have been implicated in the catalysis of phosphatidylinositol-specific phospholipase C (PI-PLC). In this report, we present the first study of the pK,, values of histidines of a PI-PLC. All six histidines of Bacillus cereus PI-PLC were studied by 2D NMR spectroscopy and site-directed mutagenesis. The protein was selec- tively labeled with '3C"-histidine. A series of 'H-I3C HSQC NMR spectra were acquired over a pH range of 4.0-9.0. Five of the six histidines have been individually substituted with alanine to aid the resonance assignments in the NMR spectra. Overall, the remaining histidines in the mutants show little chemical shift changes in the 'H-"C HSQC spectra, indicating that the alanine substitution has no effect on the tertiary structure of the protein. H32A and H82A mutants are inactive enzymes, while H92A and H61A are fully active, and H81A retains about 15% of the wild-type activity. The active site histidines, His32 and His82, display pK,, values of 7.6 and 6.9, respectively. His92 and His227 exhibit pK, values of 5.4 and 6.9. -
Families and the Structural Relatedness Among Globular Proteins
Protein Science (1993), 2, 884-899. Cambridge University Press. Printed in the USA. Copyright 0 1993 The Protein Society -~~ ~~~~ ~ Families and the structural relatedness among globular proteins DAVID P. YEE AND KEN A. DILL Department of Pharmaceutical Chemistry, University of California, San Francisco, California94143-1204 (RECEIVEDJanuary 6, 1993; REVISEDMANUSCRIPT RECEIVED February 18, 1993) Abstract Protein structures come in families. Are families “closely knit” or “loosely knit” entities? We describe a mea- sure of relatedness among polymer conformations. Based on weighted distance maps, this measure differs from existing measures mainly in two respects: (1) it is computationally fast, and (2) it can compare any two proteins, regardless of their relative chain lengths or degree of similarity. It does not require finding relative alignments. The measure is used here to determine the dissimilarities between all 12,403 possible pairs of 158 diverse protein structures from the Brookhaven Protein Data Bank (PDB). Combined with minimal spanning trees and hier- archical clustering methods,this measure is used to define structural families. It is also useful for rapidly searching a dataset of protein structures for specific substructural motifs.By using an analogy to distributions of Euclid- ean distances, we find that protein families are not tightly knit entities. Keywords: protein family; relatedness; structural comparison; substructure searches Pioneering work over the past 20 years has shown that positions after superposition. RMS is a useful distance proteins fall into families of related structures (Levitt & metric for comparingstructures that arenearly identical: Chothia, 1976; Richardson, 1981; Richardson & Richard- for example, when refining or comparing structures ob- son, 1989; Chothia & Finkelstein, 1990). -
A Sleeping Beauty Mutagenesis Screen Reveals a Tumor Suppressor Role for Ncoa2/Src-2 in Liver Cancer
A Sleeping Beauty mutagenesis screen reveals a tumor suppressor role for Ncoa2/Src-2 in liver cancer Kathryn A. O’Donnella,b,1,2, Vincent W. Kengc,d,e, Brian Yorkf, Erin L. Reinekef, Daekwan Seog, Danhua Fanc,h, Kevin A. T. Silversteinc,h, Christina T. Schruma,b, Wei Rose Xiea,b,3, Loris Mularonii,j, Sarah J. Wheelani,j, Michael S. Torbensonk, Bert W. O’Malleyf, David A. Largaespadac,d,e, and Jef D. Boekea,b,i,2 Departments of aMolecular Biology and Genetics, iOncology, jDivision of Biostatistics and Bioinformatics, and kPathology, and bThe High Throughput Biology Center, The Johns Hopkins University School of Medicine, Baltimore, MD 21205; cMasonic Cancer Center, dDepartment of Genetics, Cell Biology, and Development, eCenter for Genome Engineering, and hBiostatistics and Bioinformatics Core, University of Minnesota, Minneapolis, MN 55455; fDepartment of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030; and gLaboratory of Experimental Carcinogenesis, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892 AUTHOR SUMMARY Emerging data from cancer ge- functions are altered. This ap- fi nome-sequencing studies have Sleeping Beauty (SB) transposase proach identi ed at least 16 demonstrated that human genes/loci that contribute to liver tumors exhibit tremendous Transposon array with gene trap (GT) tumor development. complexity and heterogeneity in We next validated that the the number and nature of iden- genes identified in the SB screen tified mutations (1). Based on contribute to tumor initiation these findings, there is an in- SB mobilization and/or progression using in vitro creasing need for in vivo vali- and in vivo cancer model sys- dation of genes whose altered tems. -
Genome of Phaeocystis Globosa Virus Pgv-16T Highlights the Common Ancestry of the Largest Known DNA Viruses Infecting Eukaryotes
Genome of Phaeocystis globosa virus PgV-16T highlights the common ancestry of the largest known DNA viruses infecting eukaryotes Sebastien Santinia, Sandra Jeudya, Julia Bartolia, Olivier Poirota, Magali Lescota, Chantal Abergela, Valérie Barbeb, K. Eric Wommackc, Anna A. M. Noordeloosd, Corina P. D. Brussaardd,e,1, and Jean-Michel Claveriea,f,1 aStructural and Genomic Information Laboratory, Unité Mixte de Recherche 7256, Centre National de la Recherche Scientifique, Aix-Marseille Université, 13288 Marseille Cedex 9, France; bCommissariat à l’Energie Atomique–Institut de Génomique, 91057 Evry Cedex, France; cDepartment of Plant and Soil Sciences, University of Delaware, Newark, DE 19711; dDepartment of Biological Oceanography, Royal Netherlands Institute for Sea Research, NL-1790 AB Den Burg (Texel), The Netherlands; eAquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, The Netherlands; and fService de Santé Publique et d’Information Médicale, Hôpital de la Timone, Assistance Publique–Hôpitaux de Marseille, FR-13385 Marseille, France Edited by James L. Van Etten, University of Nebraska, Lincoln, NE, and approved May 1, 2013 (received for review February 22, 2013) Large dsDNA viruses are involved in the population control of many viruses: 730 kb and 1.28 Mb for CroV and Megavirus chilensis, globally distributed species of eukaryotic phytoplankton and have respectively. Other studies, targeting virus-specific genes [e.g., a prominent role in bloom termination. The genus Phaeocystis (Hap- DNA polymerase B (8) or capsid proteins (9)] have suggested tophyta, Prymnesiophyceae) includes several high-biomass-forming a close phylogenetic relationship between Mimivirus and several phytoplankton species, such as Phaeocystis globosa, the blooms of giant dsDNA viruses infecting various unicellular algae such as which occur mostly in the coastal zone of the North Atlantic and the Pyramimonas orientalis (Chlorophyta, Prasinophyceae), Phaeocys- North Sea. -
RNA As a Source of Transposase for Sleeping Beauty-Mediated Gene Insertion and Expression in Somatic Cells and Tissues
doi:10.1016/j.ymthe.2005.10.014 SHORT COMMUNICATION RNA as a Source of Transposase for Sleeping Beauty-Mediated Gene Insertion and Expression in Somatic Cells and Tissues Andrew Wilber,1 Joel L. Frandsen,1 Jennifer L. Geurts,1 David A. Largaespada,1 Perry B. Hackett,1,2 and R. Scott McIvor1,* 1The Arnold and Mabel Beckman Center for Transposon Research, Gene Therapy Program, Institute of Human Genetics, and Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA 2Discovery Genomics, Inc., Minneapolis, MN 55455, USA *To whom correspondence and reprint requests should be addressed at The Department of Genetics, Cell Biology, and Development, 6-160 Jackson Hall, 321 Church Street SE, University of Minnesota, Minneapolis, MN 55455, USA. Fax: +1 612 625 9810. E-mail: [email protected]. Available online 20 December 2005 Sleeping Beauty (SB) is a DNA transposon capable of mediating gene insertion and long-term expression in vertebrate cells when co-delivered with a source of transposase. In all previous reports of SB-mediated gene insertion in somatic cells, the transposase component has been provided by expression of a co-delivered DNA molecule that has the potential for integration into the host cell genome. Integration and continued expression of a gene encoding SB transposase could be problematic if it led to transposon re-mobilization and re-integration. We addressed this potential problem by supplying the transposase-encoding molecule in the form of mRNA. We show that transposase-encoding mRNA can effectively mediate transposition in vitro in HT1080 cells and in vivo in mouse liver following co-delivery with a recoverable transposon or with a luciferase transposon. -
Licensing RNA-Guided Genome Defense
TIBS-1023; No. of Pages 10 Review Recognizing the enemy within: licensing RNA-guided genome defense Phillip A. Dumesic and Hiten D. Madhani Department of Biochemistry and Biophysics, University of California, San Francisco, CA 94158, USA How do cells distinguish normal genes from transpo- RNAi-related RNA silencing pathways are deeply con- sons? Although much has been learned about RNAi- served genome defense mechanisms that act in organisms related RNA silencing pathways responsible for genome from protist to human to recognize and suppress transpo- defense, this fundamental question remains. The litera- sons [8]. In all of these pathways, 20–30 nucleotide small ture points to several classes of mechanisms. In some RNAs act in complex with Argonaute family proteins to cases, double-stranded RNA (dsRNA) structures pro- silence complementary transcripts. Depending on the duced by transposon inverted repeats or antisense inte- pathway and context, silencing proceeds by a variety of gration trigger endogenous small interfering RNA mechanisms, which include RNA degradation, translation- (siRNA) biogenesis. In other instances, DNA features al repression, and the establishment of repressive histone associated with transposons – such as their unusual modifications [9,10]. The pathways also differ in the means copy number, chromosomal arrangement, and/or chro- by which they generate small RNAs. In the canonical RNAi matin environment – license RNA silencing. Finally, re- pathway, RNase-III-type Dicer enzymes convert long cent studies have identified improper transcript dsRNA into small interfering RNA (siRNA). In contrast, processing events, such as stalled pre-mRNA splicing, PIWI-interacting RNA (piRNA) pathways do not require as signals for siRNA production. -
Exploring the Interplay of Telomerase Reverse Transcriptase and Β-Catenin in Hepatocellular Carcinoma
cancers Review Exploring the Interplay of Telomerase Reverse Transcriptase and β-Catenin in Hepatocellular Carcinoma Srishti Kotiyal and Kimberley Jane Evason * Department of Oncological Sciences, Department of Pathology, and Huntsman Cancer Institute, University of Utah, Salt Lake City, UT 84112, USA; [email protected] * Correspondence: [email protected]; Tel.: +1-801-587-4606 Simple Summary: Liver cancer is one of the deadliest human cancers. Two of the most common molecular aberrations in liver cancer are: (1) activating mutations in the gene encoding β-catenin (CTNNB1); and (2) promoter mutations in telomerase reverse transcriptase (TERT). Here, we review recent findings regarding the interplay between TERT and β-catenin in order to better understand their role in liver cancer. Abstract: Hepatocellular carcinoma (HCC) is one of the deadliest human cancers. Activating muta- tions in the telomerase reverse transcriptase (TERT) promoter (TERTp) and CTNNB1 gene encoding β-catenin are widespread in HCC (~50% and ~30%, respectively). TERTp mutations are predicted to increase TERT transcription and telomerase activity. This review focuses on exploring the role of TERT and β-catenin in HCC and the current findings regarding their interplay. TERT can have contradictory effects on tumorigenesis via both its canonical and non-canonical functions. As a critical regulator of proliferation and differentiation in progenitor and stem cells, activated β-catenin drives HCC; however, inhibiting endogenous β-catenin can also have pro-tumor effects. Clinical studies revealed a significant concordance between TERTp and CTNNB1 mutations in HCC. In Citation: Kotiyal, S.; Evason, K.J. stem cells, TERT acts as a co-factor in β-catenin transcriptional complexes driving the expression Exploring the Interplay of Telomerase of WNT/β-catenin target genes, and β-catenin can bind to the TERTp to drive its transcription. -
Structures, Functions, and Mechanisms of Filament Forming Enzymes: a Renaissance of Enzyme Filamentation
Structures, Functions, and Mechanisms of Filament Forming Enzymes: A Renaissance of Enzyme Filamentation A Review By Chad K. Park & Nancy C. Horton Department of Molecular and Cellular Biology University of Arizona Tucson, AZ 85721 N. C. Horton ([email protected], ORCID: 0000-0003-2710-8284) C. K. Park ([email protected], ORCID: 0000-0003-1089-9091) Keywords: Enzyme, Regulation, DNA binding, Nuclease, Run-On Oligomerization, self-association 1 Abstract Filament formation by non-cytoskeletal enzymes has been known for decades, yet only relatively recently has its wide-spread role in enzyme regulation and biology come to be appreciated. This comprehensive review summarizes what is known for each enzyme confirmed to form filamentous structures in vitro, and for the many that are known only to form large self-assemblies within cells. For some enzymes, studies describing both the in vitro filamentous structures and cellular self-assembly formation are also known and described. Special attention is paid to the detailed structures of each type of enzyme filament, as well as the roles the structures play in enzyme regulation and in biology. Where it is known or hypothesized, the advantages conferred by enzyme filamentation are reviewed. Finally, the similarities, differences, and comparison to the SgrAI system are also highlighted. 2 Contents INTRODUCTION…………………………………………………………..4 STRUCTURALLY CHARACTERIZED ENZYME FILAMENTS…….5 Acetyl CoA Carboxylase (ACC)……………………………………………………………………5 Phosphofructokinase (PFK)……………………………………………………………………….6 -
Purification and Characterization of Cutinase from Venturia Inaequalis
Physiology and Biochemistry Purification and Characterization of Cutinase from Venturia inaequalis Wolfram K611er and Diana M. Parker Assistant professor and research assistant, Department of Plant Pathology, Cornell University, New York State Agricultural Experiment Station, Geneva 14456. We thank Professor A. L. Jones for the isolates of Venturia inaequalis, Mr. Robert W. Ennis, Jr. for his help in cutin preparation, and Comstock Foods, Alton, NY, for the apple peels. Accepted for publication 16 August 1988. ABSTRACT K61ler, W., and Parker, D. M. 1989. Purification and characterization of cutinase from Venturia inaequalis. Phytopathology 79:278-283. Venturia inaequalis was grown in a culture medium containing purified cutinase from V. inaequalisis optimal at a pH of 6 and thus different from apple cutin as the sole carbon source. After 8 wk of growth an esterase was the alkaline pH-optimum reported for other purified cutinases. The isolated from the culture fluid and purified to apparent homogeneity. The hydrolysis of the model esterp-nitrophenyl butyrate was less affected by the enzyme hydrolyzed tritiated cutin and thus was identified as cutinase. The pH. The esterase activity was strongly inhibited by diisopropyl purified cutinase is a glycoprotein with a molecular mass of 21-23 kg/ mol, fluorophosphate, and the phosphorylation of one serine was sufficient for as determined by various procedures. Remarkable structural features are a complete inhibition. Thus, cutinase from V. inaequalis belongs to the class high content of glycine, a high content of nonpolar amino acids, two of serine hydrolases, a characterisitic shared with other fungal cutinases. disulfide bridges, and a high degree of hydrophobicity. -
Biological Phosphorylation of an Unnatural Base Pair (UBP) Using a Drosophila Melanogaster Deoxynucleoside Kinase (Dmdnk) Mutant
RESEARCH ARTICLE Biological phosphorylation of an Unnatural Base Pair (UBP) using a Drosophila melanogaster deoxynucleoside kinase (DmdNK) mutant Fei Chen1,2,3☯*, Yuan Zhang4☯, Ashley B. Daugherty5, Zunyi Yang3, Ryan Shaw3, Mengxing Dong1,2, Stefan Lutz5, Steven A. Benner3* a1111111111 1 CAS Key Laboratory of Genome Sciences & Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China, 2 University of Chinese Academy of Sciences, Beijing, China, 3 Foundation for a1111111111 Applied Molecular Evolution (FfAME), Alachua, Florida, United States of America, 4 College of Chemistry, a1111111111 Beijing Normal University, Beijing, China, 5 Department of Chemistry, Emory University School of Medicine, a1111111111 Atlanta, Georgia, United States of America a1111111111 ☯ These authors contributed equally to this work. * [email protected] (FC); [email protected] (SAB) OPEN ACCESS Abstract Citation: Chen F, Zhang Y, Daugherty AB, Yang Z, Shaw R, Dong M, et al. (2017) Biological One research goal for unnatural base pair (UBP) is to replicate, transcribe and translate phosphorylation of an Unnatural Base Pair (UBP) them in vivo. Accordingly, the corresponding unnatural nucleoside triphosphates must be using a Drosophila melanogaster deoxynucleoside available at sufficient concentrations within the cell. To achieve this goal, the unnatural kinase (DmdNK) mutant. PLoS ONE 12(3): nucleoside analogues must be phosphorylated to the corresponding nucleoside triphos- e0174163. https://doi.org/10.1371/journal. pone.0174163 phates by a cascade of three kinases. The first step is the monophosphorylation of unnatural deoxynucleoside catalyzed by deoxynucleoside kinases (dNK), which is generally consid- Editor: Giovanni Maga, Istituto di Genetica Molecolare, ITALY ered the rate limiting step because of the high specificity of dNKs.