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Ye F, Kotta-Loizou I, Jovanovic M, Liu X, Dryden DTF, Buck M, Zhang X. Structural basis of transcription inhibition by the DNA mimic protein Ocr of bacteriophage T7. eLife 2020; 9:e52125. [PMID: 32039758 PMCID: PMC7064336 DOI: 10.7554/elife.52125] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 02/08/2020] [Indexed: 01/25/2023] Open
Abstract
Bacteriophage T7 infects Escherichia coli and evades the host restriction/modification system. The Ocr protein of T7 was shown to exist as a dimer mimicking DNA and to bind to host restriction enzymes, thus preventing the degradation of the viral genome by the host. Here we report that Ocr can also inhibit host transcription by directly binding to bacterial RNA polymerase (RNAP) and competing with the recruitment of RNAP by sigma factors. Using cryo electron microscopy, we determined the structures of Ocr bound to RNAP. The structures show that an Ocr dimer binds to RNAP in the cleft, where key regions of sigma bind and where DNA resides during transcription synthesis, thus providing a structural basis for the transcription inhibition. Our results reveal the versatility of Ocr in interfering with host systems and suggest possible strategies that could be exploited in adopting DNA mimicry as a basis for forming novel antibiotics.
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Affiliation(s)
- Fuzhou Ye
- Section of Structural Biology, Department of Infectious Diseases, Faculty of MedicineImperial College LondonLondonUnited Kingdom
| | - Ioly Kotta-Loizou
- Department of Life Sciences, Faculty of Natural SciencesImperial College LondonLondonUnited Kingdom
| | - Milija Jovanovic
- Department of Life Sciences, Faculty of Natural SciencesImperial College LondonLondonUnited Kingdom
| | - Xiaojiao Liu
- Section of Structural Biology, Department of Infectious Diseases, Faculty of MedicineImperial College LondonLondonUnited Kingdom
- College of Food Science and EngineeringNorthwest A&F UniversityYanglingChina
| | | | - Martin Buck
- Department of Life Sciences, Faculty of Natural SciencesImperial College LondonLondonUnited Kingdom
| | - Xiaodong Zhang
- Section of Structural Biology, Department of Infectious Diseases, Faculty of MedicineImperial College LondonLondonUnited Kingdom
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Yüksel D, Bianco PR, Kumar K. De novo design of protein mimics of B-DNA. MOLECULAR BIOSYSTEMS 2016; 12:169-77. [PMID: 26568416 PMCID: PMC4699573 DOI: 10.1039/c5mb00524h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Structural mimicry of DNA is utilized in nature as a strategy to evade molecular defences mounted by host organisms. One such example is the protein Ocr - the first translation product to be expressed as the bacteriophage T7 infects E. coli. The structure of Ocr reveals an intricate and deliberate arrangement of negative charges that endows it with the ability to mimic ∼24 base pair stretches of B-DNA. This uncanny resemblance to DNA enables Ocr to compete in binding the type I restriction modification (R/M) system, and neutralizes the threat of hydrolytic cleavage of viral genomic material. Here, we report the de novo design and biophysical characterization of DNA mimicking peptides, and describe the inhibitory action of the designed helical bundles on a type I R/M enzyme, EcoR124I. This work validates the use of charge patterning as a design principle for creation of protein mimics of DNA, and serves as a starting point for development of therapeutic peptide inhibitors against human pathogens that employ molecular camouflage as part of their invasion stratagem.
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Affiliation(s)
- Deniz Yüksel
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, MA 02155, USA.
| | - Piero R Bianco
- Department of Microbiology and Immunology, University at Buffalo, The State University of New York, Buffalo, NY 14214, USA.
| | - Krishna Kumar
- Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, MA 02155, USA. and Cancer Center, Tufts Medical Center, Boston, MA 02111, USA
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3
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Switt AIM, Sulakvelidze A, Wiedmann M, Kropinski AM, Wishart DS, Poppe C, Liang Y. Salmonella phages and prophages: genomics, taxonomy, and applied aspects. Methods Mol Biol 2015; 1225:237-87. [PMID: 25253259 DOI: 10.1007/978-1-4939-1625-2_15] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Since this book was originally published in 2007 there has been a significant increase in the number of Salmonella bacteriophages, particularly lytic virus, and Salmonella strains which have been fully sequenced. In addition, new insights into phage taxonomy have resulted in new phage genera, some of which have been recognized by the International Committee of Taxonomy of Viruses (ICTV). The properties of each of these genera are discussed, along with the role of phage as agents of genetic exchange, as therapeutic agents, and their involvement in phage typing.
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Affiliation(s)
- Andrea I Moreno Switt
- Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, Escuela de Medicina Veterinaria, Republica 440, 8370251, Santiago, Chile
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4
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Leon-Velarde CG, Kropinski AM, Chen S, Abbasifar A, Griffiths MW, Odumeru JA. Complete genome sequence of bacteriophage vB_YenP_AP5 which infects Yersinia enterocolitica of serotype O:3. Virol J 2014; 11:188. [PMID: 25347934 PMCID: PMC4283147 DOI: 10.1186/1743-422x-11-188] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Accepted: 10/19/2014] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Bacteriophage vB_YenP_AP5 is a lytic bacteriophage capable of infecting Yersinia enterocolitica strains of serotype O:3, an epidemiologically significant serotype within this bacterial species that causes yersiniosis in humans. This work describes the complete genome sequence of this phage. RESULTS The genome consists of linear double-stranded DNA of 38,646 bp, with direct terminal repeats of 235 bp in length, and a GC content of 50.7%. There are 45 open reading frames which occupy 89.9% of the genome. Most of the proteins encoded by this virus exhibit sequence similarity to Yersinia phage φYeO3-12 and Salmonella phage φSG-JL2 proteins. CONCLUSIONS Genomic and morphological analyses place the bacteriophage vB_YenP_AP5 in the T7likevirus genus of the subfamily Autographivirinae within the family Podoviridae.
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Affiliation(s)
- Carlos G Leon-Velarde
- />Laboratory Services Division, University of Guelph, Guelph, ON N1H 8J7 Canada
- />Department of Food Science, University of Guelph, Guelph, ON N1G 2W1 Canada
| | - Andrew M Kropinski
- />Department of Pathobiology, University of Guelph, Guelph, ON N1G 2W1 Canada
- />Department of Molecular and Cellular Biology, University of Guelph, Guelph, ON N1G 2W1 Canada
| | - Shu Chen
- />Laboratory Services Division, University of Guelph, Guelph, ON N1H 8J7 Canada
| | - Arash Abbasifar
- />Canadian Research Institute for Food Safety, University of Guelph, Guelph, ON N1G 2W1 Canada
| | - Mansel W Griffiths
- />Canadian Research Institute for Food Safety, University of Guelph, Guelph, ON N1G 2W1 Canada
- />Department of Food Science, University of Guelph, Guelph, ON N1G 2W1 Canada
| | - Joseph A Odumeru
- />Department of Food Science, University of Guelph, Guelph, ON N1G 2W1 Canada
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5
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Xu B, Ma X, Xiong H, Li Y. Complete genome sequence of 285P, a novel T7-like polyvalent E. coli bacteriophage. Virus Genes 2014; 48:528-33. [PMID: 24668157 DOI: 10.1007/s11262-014-1059-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 03/10/2014] [Indexed: 11/26/2022]
Abstract
Bacteriophages are considered potential biological agents for the control of infectious diseases and environmental disinfection. Here, we describe a novel T7-like polyvalent Escherichia coli bacteriophage, designated "285P," which can lyse several strains of E. coli. The genome, which consists of 39,270 base pairs with a G+C content of 48.73 %, was sequenced and annotated. Forty-three potential open reading frames were identified using bioinformatics tools. Based on whole-genome sequence comparison, phage 285P was identified as a novel strain of subgroup T7. It showed strongest sequence similarity to Kluyvera phage Kvp1. The phylogenetic analyses of both non-structural proteins (endonuclease gp3, amidase gp3.5, DNA primase/helicase gp4, DNA polymerase gp5, and exonuclease gp6) and structural protein (tail fiber protein gp17) led to the identification of 285P as T7-like phage. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and matrix-assisted laser desorption/ionization time-of-flight mass spectrometric analyses verified the annotation of the structural proteins (major capsid protein gp10a, tail protein gp12, and tail fiber protein gp17).
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Affiliation(s)
- Bin Xu
- Department of Epidemiology, College of Preventive Medicine, Third Military Medical University, Gaotanyan Street 30, Chongqing, 400038, China
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6
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The genome and proteome of the Kluyvera bacteriophage Kvp1--another member of the T7-like Autographivirinae. Virol J 2008; 5:122. [PMID: 18937848 PMCID: PMC2579914 DOI: 10.1186/1743-422x-5-122] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2008] [Accepted: 10/20/2008] [Indexed: 11/23/2022] Open
Abstract
Background Kluyvera, a genus within the family Enterobacteriaceae, is an infrequent cause of human infections. Bacteriophage Kvp1, the only bacteriophage isolated for one of its species, Kluyvera cryocrescens, is a member of the viral family Podoviridae. Results The genome of Kvp1, the first Kluyvera cryocrescens-specific bacteriophage, was sequenced using pyrosequencing (454 technology) at the McGill University and Genome Québec Innovation Centre. The two contigs were closed using PCR and the sequence of the terminal repeats completed by primer walking off the phage DNA. The phage structural proteome was investigated by SDS-PAGE and mass spectrometry. Conclusion At 39,472 bp, the annotated genome revealed a closer relationship to coliphage T3 than T7 with Kvp1 containing homologs to T3 early proteins S-adenosyl-L-methionine hydrolase (0.3) and protein kinase (0.7). The quantitative nature of the relationships between Kvp1 and the other members of the T7-like virus genus (T7, T3, φA1122, φYeO3-12, Berlin, K1F, VP4 and gh-1) was confirmed using CoreGenes.
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Tsonis PA, Dwivedi B. Molecular mimicry: structural camouflage of proteins and nucleic acids. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2007; 1783:177-87. [PMID: 18068679 DOI: 10.1016/j.bbamcr.2007.11.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2007] [Revised: 11/05/2007] [Accepted: 11/06/2007] [Indexed: 11/28/2022]
Abstract
When it comes to protein specificity and function their three-dimensional structure is the ultimate determinant. Thus, sequences that participate in key parts, such as catalytic sites or DNA binding have been favored and maintained highly conserved during evolution. However, in a reversal of fortune, selection has favored conservation of shapes over sequence, especially when proteins look like nucleic acids. Proteins from pathogens evade the host's defenses because they are shaped as DNA; others use such a disguise for transcriptional regulation. Several factors are tRNA look-alikes so that they can efficiently control the process of protein synthesis. Molecular mimicry among RNAs could result in a new unexplored level in gene regulation. This comprehensive review outlines this important area and aims to emphasize that molecular mimicry could in fact be more widespread than initially thought and eventually adds a new layer of genetic regulation.
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Kropinski AM, Sulakvelidze A, Konczy P, Poppe C. Salmonella phages and prophages--genomics and practical aspects. Methods Mol Biol 2007; 394:133-75. [PMID: 18363236 DOI: 10.1007/978-1-59745-512-1_9] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Numerous bacteriophages specific to Salmonella have been isolated or identified as part of host genome sequencing projects. Phylogenetic analysis of the sequenced phages, based on related protein content using CoreGenes, reveals that these viruses fall into five groupings (P27-like, P2-like, lambdoid, P22-like, and T7-like) and three outliers (epsilon15, KS7, and Felix O1). The P27 group is only represented by ST64B; the P2 group contains Fels-2, SopEphi, and PSP3; the lambdoid Salmonella phages include Gifsy-1, Gifsy-2, and Fels-1. The P22-like viruses include epsilon34, ES18, P22, ST104, and ST64T. The only member of the T7-like group is SP6. The properties of each of these phages are discussed, along with their role as agents of genetic exchange and as therapeutic agents and their involvement in phage typing.
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Affiliation(s)
- Andrew M Kropinski
- Host and Pathogen Determinants, Laboratory for Foodborne Zoonoses, Public Health Agency of Canada, Guelph, Ontario
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Walkinshaw MD, Taylor P, Sturrock SS, Atanasiu C, Berge T, Henderson RM, Edwardson JM, Dryden DTF. Structure of Ocr from bacteriophage T7, a protein that mimics B-form DNA. Mol Cell 2002; 9:187-94. [PMID: 11804597 DOI: 10.1016/s1097-2765(02)00435-5] [Citation(s) in RCA: 135] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
We have solved, by X-ray crystallography to a resolution of 1.8 A, the structure of a protein capable of mimicking approximately 20 base pairs of B-form DNA. This ocr protein, encoded by gene 0.3 of bacteriophage T7, mimics the size and shape of a bent DNA molecule and the arrangement of negative charges along the phosphate backbone of B-form DNA. We also demonstrate that ocr is an efficient inhibitor in vivo of all known families of the complex type I DNA restriction enzymes. Using atomic force microscopy, we have also observed that type I enzymes induce a bend in DNA of similar magnitude to the bend in the ocr molecule. This first structure of an antirestriction protein demonstrates the construction of structural mimetics of long segments of B-form DNA.
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Affiliation(s)
- M D Walkinshaw
- Institute of Cell and Molecular Biology, The King's Buildings, University of Edinburgh, EH9 3JR, Edinburgh, United Kingdom.
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