1
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Peñafiel-Ayala A, Peralta-Castro A, Mora-Garduño J, García-Medel P, Zambrano-Pereira AG, Díaz-Quezada C, Abraham-Juárez MJ, Benítez-Cardoza CG, Sloan DB, Brieba LG. Plant Organellar MSH1 Is a Displacement Loop-Specific Endonuclease. PLANT & CELL PHYSIOLOGY 2024; 65:560-575. [PMID: 37756637 DOI: 10.1093/pcp/pcad112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 09/09/2023] [Accepted: 09/19/2023] [Indexed: 09/29/2023]
Abstract
MutS HOMOLOG 1 (MSH1) is an organellar-targeted protein that obstructs ectopic recombination and the accumulation of mutations in plant organellar genomes. MSH1 also modulates the epigenetic status of nuclear DNA, and its absence induces a variety of phenotypic responses. MSH1 is a member of the MutS family of DNA mismatch repair proteins but harbors an additional GIY-YIG nuclease domain that distinguishes it from the rest of this family. How MSH1 hampers recombination and promotes fidelity in organellar DNA inheritance is unknown. Here, we elucidate its enzymatic activities by recombinantly expressing and purifying full-length MSH1 from Arabidopsis thaliana (AtMSH1). AtMSH1 is a metalloenzyme that shows a strong binding affinity for displacement loops (D-loops). The DNA-binding abilities of AtMSH1 reside in its MutS domain and not in its GIY-YIG domain, which is the ancillary nickase of AtMSH1. In the presence of divalent metal ions, AtMSH1 selectively executes multiple incisions at D-loops, but not other DNA structures including Holliday junctions or dsDNA, regardless of the presence or absence of mismatches. The selectivity of AtMSH1 to dismantle D-loops supports the role of this enzyme in preventing recombination between short repeats. Our results suggest that plant organelles have evolved novel DNA repair routes centered around the anti-recombinogenic activity of MSH1.
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Affiliation(s)
- Alejandro Peñafiel-Ayala
- Langebio-Cinvestav Sede Irapuato, Km. 9.6 Libramiento Norte Carretera. Irapuato-León, Irapuato, Guanajuato 36821, México
| | - Antolin Peralta-Castro
- Langebio-Cinvestav Sede Irapuato, Km. 9.6 Libramiento Norte Carretera. Irapuato-León, Irapuato, Guanajuato 36821, México
| | - Josue Mora-Garduño
- Langebio-Cinvestav Sede Irapuato, Km. 9.6 Libramiento Norte Carretera. Irapuato-León, Irapuato, Guanajuato 36821, México
| | - Paola García-Medel
- Langebio-Cinvestav Sede Irapuato, Km. 9.6 Libramiento Norte Carretera. Irapuato-León, Irapuato, Guanajuato 36821, México
| | - Angie G Zambrano-Pereira
- Langebio-Cinvestav Sede Irapuato, Km. 9.6 Libramiento Norte Carretera. Irapuato-León, Irapuato, Guanajuato 36821, México
| | - Corina Díaz-Quezada
- Langebio-Cinvestav Sede Irapuato, Km. 9.6 Libramiento Norte Carretera. Irapuato-León, Irapuato, Guanajuato 36821, México
| | - María Jazmín Abraham-Juárez
- Langebio-Cinvestav Sede Irapuato, Km. 9.6 Libramiento Norte Carretera. Irapuato-León, Irapuato, Guanajuato 36821, México
| | - Claudia G Benítez-Cardoza
- Laboratorio de Investigación Bioquímica, Programa Institucional en Biomedicina Molecular ENMyH-IPN, Guillermo Massieu Helguera No. 239, La Escalera Ticoman 07320 DF, México
| | - Daniel B Sloan
- Department of Biology, Colorado State University, Fort Collins, CO 80523, USA
| | - Luis G Brieba
- Langebio-Cinvestav Sede Irapuato, Km. 9.6 Libramiento Norte Carretera. Irapuato-León, Irapuato, Guanajuato 36821, México
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2
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Wu S, Chen Y, Chen Z, Wei F, Zhou Q, Li P, Gu Q. Reactive oxygen species and gastric carcinogenesis: The complex interaction between Helicobacter pylori and host. Helicobacter 2023; 28:e13024. [PMID: 37798959 DOI: 10.1111/hel.13024] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 09/10/2023] [Accepted: 09/21/2023] [Indexed: 10/07/2023]
Abstract
Helicobacter pylori (H. pylori) is a highly successful human pathogen that colonizes stomach in around 50% of the global population. The colonization of bacterium induces an inflammatory response and a substantial rise in the production of reactive oxygen species (ROS) and reactive nitrogen species (RNS), mostly derived from host neutrophils and gastric epithelial cells, which play a crucial role in combating bacterial infections. However, H. pylori has developed various strategies to quench the deleterious effects of ROS, including the production of antioxidant enzymes, antioxidant proteins as well as blocking the generation of oxidants. The host's inability to eliminate H. pylori infection results in persistent ROS production. Notably, excessive ROS can disrupt the intracellular signal transduction and biological processes of the host, incurring chronic inflammation and cellular damage, such as DNA damage, lipid peroxidation, and protein oxidation. Markedly, the sustained inflammatory response and oxidative stress during H. pylori infection are major risk factor for gastric carcinogenesis. In this context, we summarize the literature on H. pylori infection-induced ROS production, the strategies used by H. pylori to counteract the host response, and subsequent host damage and gastric carcinogenesis.
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Affiliation(s)
- Shiying Wu
- Key Laboratory for Food Microbial Technology of Zhejiang Province, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
| | - Yongqiang Chen
- Key Laboratory for Food Microbial Technology of Zhejiang Province, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
| | - Ziqi Chen
- Key Laboratory for Food Microbial Technology of Zhejiang Province, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
| | - Fangtong Wei
- Key Laboratory for Food Microbial Technology of Zhejiang Province, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
| | - Qingqing Zhou
- Key Laboratory for Food Microbial Technology of Zhejiang Province, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
| | - Ping Li
- Key Laboratory for Food Microbial Technology of Zhejiang Province, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
| | - Qing Gu
- Key Laboratory for Food Microbial Technology of Zhejiang Province, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
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3
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ComFC mediates transport and handling of single-stranded DNA during natural transformation. Nat Commun 2022; 13:1961. [PMID: 35414142 PMCID: PMC9005727 DOI: 10.1038/s41467-022-29494-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 03/17/2022] [Indexed: 11/09/2022] Open
Abstract
The ComFC protein is essential for natural transformation, a process that plays a major role in the spread of antibiotic resistance genes and virulence factors across bacteria. However, its role remains largely unknown. Here, we show that Helicobacter pylori ComFC is involved in DNA transport through the cell membrane, and is required for the handling of the single-stranded DNA once it is delivered into the cytoplasm. The crystal structure of ComFC includes a zinc-finger motif and a putative phosphoribosyl transferase domain, both necessary for the protein's in vivo activity. Furthermore, we show that ComFC is a membrane-associated protein with affinity for single-stranded DNA. Our results suggest that ComFC provides the link between the transport of the transforming DNA into the cytoplasm and its handling by the recombination machinery.
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4
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Fukui K, Inoue M, Murakawa T, Baba S, Kumasaka T, Yano T. Structural and functional insights into the mechanism by which MutS2 recognizes a DNA junction. Structure 2022; 30:973-982.e4. [DOI: 10.1016/j.str.2022.03.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 03/11/2022] [Accepted: 03/23/2022] [Indexed: 10/18/2022]
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5
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Kondekar SM, Gunjal GV, Pablo Radicella J, Rao DN. Molecular dissection of Helicobacter pylori Topoisomerase I reveals an additional active site in the carboxyl terminus of the enzyme. DNA Repair (Amst) 2020; 91-92:102853. [PMID: 32447233 DOI: 10.1016/j.dnarep.2020.102853] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 03/07/2020] [Accepted: 04/05/2020] [Indexed: 12/15/2022]
Abstract
DNA topoisomerases play a crucial role in maintaining DNA superhelicity, thereby regulating various cellular processes. Unlike most other species, the human pathogen Helicobacter pylori has only two topoisomerases, Topoisomerase I and DNA gyrase, the physiological roles of which remain to be explored. Interestingly, there is enormous variability among the C-terminal domains (CTDs) of Topoisomerase I across bacteria. H. pylori Topoisomerase I (HpTopoI) CTD harbors four zinc finger motifs (ZFs). We show here that sequential deletion of the third and/or fourth ZFs had only a marginal effect on the HpTopoI activity, while deletion of the second, third and fourth ZFs severely reduced DNA relaxation activity. Deletion of all ZFs drastically hampered DNA binding and thus abolished DNA relaxation. Surprisingly, mutagenesis of the annotated active site tyrosine residue (Y297 F) did not abrogate the enzyme activity and HpTopoI CTD alone (spanning the four ZFs) showed DNA relaxation activity. Additionally, a covalent linkage between the DNA and HpTopoI CTD was identified. The capacity of HpTopoI CTD to complement Escherichia coli topA mutant strains further supported the in vitro observations. Collectively these results imply that not all ZFs are dispensable for HpTopoI activity and unveil the presence of additional non-canonical catalytic site(s) within the enzyme.
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Affiliation(s)
- Sumedha M Kondekar
- Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India
| | - Gaurav V Gunjal
- Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India
| | - Juan Pablo Radicella
- Institute of Cellular and Molecular Radiobiology, Institut de Biologie François Jacob, CEA, F-92265 Fontenay aux Roses, France; Université de Paris and Université Paris-Saclay, F-92265 Fontenay aux Roses, France
| | - Desirazu N Rao
- Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India.
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Identification of the periplasmic DNA receptor for natural transformation of Helicobacter pylori. Nat Commun 2019; 10:5357. [PMID: 31767852 PMCID: PMC6877725 DOI: 10.1038/s41467-019-13352-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 10/31/2019] [Indexed: 02/08/2023] Open
Abstract
Horizontal gene transfer through natural transformation is a major driver of antibiotic resistance spreading in many pathogenic bacterial species. In the case of Gram-negative bacteria, and in particular of Helicobacter pylori, the mechanisms underlying the handling of the incoming DNA within the periplasm are poorly understood. Here we identify the protein ComH as the periplasmic receptor for the transforming DNA during natural transformation in H. pylori. ComH is a DNA-binding protein required for the import of DNA into the periplasm. Its C-terminal domain displays strong affinity for double-stranded DNA and is sufficient for the accumulation of DNA in the periplasm, but not for DNA internalisation into the cytoplasm. The N-terminal region of the protein allows the interaction of ComH with a periplasmic domain of the inner-membrane channel ComEC, which is known to mediate the translocation of DNA into the cytoplasm. Our results indicate that ComH is involved in the import of DNA into the periplasm and its delivery to the inner membrane translocator ComEC. Some bacteria can take up DNA molecules from the environment. Here, Damke et al. identify a DNA-binding protein in Helicobacter pylori that is required for DNA import into the periplasm and that interacts with an inner-membrane channel that translocates the DNA into the cytoplasm.
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7
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Brieba LG. Structure-Function Analysis Reveals the Singularity of Plant Mitochondrial DNA Replication Components: A Mosaic and Redundant System. PLANTS 2019; 8:plants8120533. [PMID: 31766564 PMCID: PMC6963530 DOI: 10.3390/plants8120533] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 11/18/2019] [Accepted: 11/19/2019] [Indexed: 02/06/2023]
Abstract
Plants are sessile organisms, and their DNA is particularly exposed to damaging agents. The integrity of plant mitochondrial and plastid genomes is necessary for cell survival. During evolution, plants have evolved mechanisms to replicate their mitochondrial genomes while minimizing the effects of DNA damaging agents. The recombinogenic character of plant mitochondrial DNA, absence of defined origins of replication, and its linear structure suggest that mitochondrial DNA replication is achieved by a recombination-dependent replication mechanism. Here, I review the mitochondrial proteins possibly involved in mitochondrial DNA replication from a structural point of view. A revision of these proteins supports the idea that mitochondrial DNA replication could be replicated by several processes. The analysis indicates that DNA replication in plant mitochondria could be achieved by a recombination-dependent replication mechanism, but also by a replisome in which primers are synthesized by three different enzymes: Mitochondrial RNA polymerase, Primase-Helicase, and Primase-Polymerase. The recombination-dependent replication model and primers synthesized by the Primase-Polymerase may be responsible for the presence of genomic rearrangements in plant mitochondria.
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Affiliation(s)
- Luis Gabriel Brieba
- Laboratorio Nacional de Genómica para la Biodiversidad, Centro de Investigación y de Estudios Avanzados del IPN, Apartado Postal 629, Irapuato, Guanajuato C.P. 36821, Mexico
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8
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Lisboa J, Celma L, Sanchez D, Marquis M, Andreani J, Guérois R, Ochsenbein F, Durand D, Marsin S, Cuniasse P, Radicella JP, Quevillon-Cheruel S. The C-terminal domain of HpDprA is a DNA-binding winged helix domain that does not bind double-stranded DNA. FEBS J 2019; 286:1941-1958. [PMID: 30771270 DOI: 10.1111/febs.14788] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 11/21/2018] [Accepted: 02/14/2019] [Indexed: 12/15/2022]
Abstract
DNA-processing protein A, a ubiquitous multidomain DNA-binding protein, plays a crucial role during natural transformation in bacteria. Here, we carried out the structural analysis of DprA from the human pathogen Helicobacter pylori by combining data issued from the 1.8-Å resolution X-ray structure of the Pfam02481 domain dimer (RF), the NMR structure of the carboxy terminal domain (CTD), and the low-resolution structure of the full-length DprA dimer obtained in solution by SAXS. In particular, we sought a molecular function for the CTD, a domain that we show here is essential for transformation in H. pylori. Albeit its structural homology to winged helix DNA-binding motifs, we confirmed that the isolated CTD does not interact with ssDNA nor with dsDNA. The key R52 and K137 residues of RF are crucial for these two interactions. Search for sequences harboring homology to either HpDprA or Rhodopseudomonas palustris DprA CTDs led to the identification of conserved patches in the two CTD. Our structural study revealed the similarity of the structures adopted by these residues in RpDprA CTD and HpDprA CTD. This argues for a conserved, but yet to be defined, CTD function, distinct from DNA binding.
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Affiliation(s)
- Johnny Lisboa
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Gif-sur-Yvette, France
| | - Louisa Celma
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Gif-sur-Yvette, France
| | - Dyana Sanchez
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Gif-sur-Yvette, France
| | - Mathilde Marquis
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Gif-sur-Yvette, France
| | - Jessica Andreani
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Gif-sur-Yvette, France
| | - Raphael Guérois
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Gif-sur-Yvette, France
| | - Françoise Ochsenbein
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Gif-sur-Yvette, France
| | - Dominique Durand
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Gif-sur-Yvette, France
| | - Stéphanie Marsin
- Institute of Cellular and Molecular Radiobiology, Institut François Jacob, CEA, Universités Paris Diderot and Paris-Sud, Fontenay aux Roses, France
| | - Philippe Cuniasse
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Gif-sur-Yvette, France
| | - J Pablo Radicella
- Institute of Cellular and Molecular Radiobiology, Institut François Jacob, CEA, Universités Paris Diderot and Paris-Sud, Fontenay aux Roses, France
| | - Sophie Quevillon-Cheruel
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Gif-sur-Yvette, France
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9
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α-Difluoromethylornithine reduces gastric carcinogenesis by causing mutations in Helicobacter pylori cagY. Proc Natl Acad Sci U S A 2019; 116:5077-5085. [PMID: 30804204 DOI: 10.1073/pnas.1814497116] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Infection by Helicobacter pylori is the primary cause of gastric adenocarcinoma. The most potent H. pylori virulence factor is cytotoxin-associated gene A (CagA), which is translocated by a type 4 secretion system (T4SS) into gastric epithelial cells and activates oncogenic signaling pathways. The gene cagY encodes for a key component of the T4SS and can undergo gene rearrangements. We have shown that the cancer chemopreventive agent α-difluoromethylornithine (DFMO), known to inhibit the enzyme ornithine decarboxylase, reduces H. pylori-mediated gastric cancer incidence in Mongolian gerbils. In the present study, we questioned whether DFMO might directly affect H. pylori pathogenicity. We show that H. pylori output strains isolated from gerbils treated with DFMO exhibit reduced ability to translocate CagA in gastric epithelial cells. Further, we frequently detected genomic modifications in the middle repeat region of the cagY gene of output strains from DFMO-treated animals, which were associated with alterations in the CagY protein. Gerbils did not develop carcinoma when infected with a DFMO output strain containing rearranged cagY or the parental strain in which the wild-type cagY was replaced by cagY with DFMO-induced rearrangements. Lastly, we demonstrate that in vitro treatment of H. pylori by DFMO induces oxidative DNA damage, expression of the DNA repair enzyme MutS2, and mutations in cagY, demonstrating that DFMO directly affects genomic stability. Deletion of mutS2 abrogated the ability of DFMO to induce cagY rearrangements directly. In conclusion, DFMO-induced oxidative stress in H. pylori leads to genomic alterations and attenuates virulence.
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10
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Minobe A, Fukui K, Yonezu H, Ohshita K, Mizobuchi S, Morisawa T, Hakumai Y, Yano T, Ashiuchi M, Wakamatsu T. Biochemical characterization of mismatch-binding protein MutS1 and nicking endonuclease MutL from a euryarchaeon Methanosaeta thermophila. DNA Repair (Amst) 2019; 75:29-38. [PMID: 30711824 DOI: 10.1016/j.dnarep.2019.01.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 01/21/2019] [Accepted: 01/21/2019] [Indexed: 12/20/2022]
Abstract
In eukaryotes and most bacteria, the MutS1/MutL-dependent mismatch repair system (MMR) corrects DNA mismatches that arise as replication errors. MutS1 recognizes mismatched DNA and stimulates the nicking endonuclease activity of MutL to incise mismatch-containing DNA. In archaea, there has been no experimental evidence to support the existence of the MutS1/MutL-dependent MMR. Instead, it was revealed that a large part of archaea possess mismatch-specific endonuclease EndoMS, indicating that the EndoMS-dependent MMR is widely adopted in archaea. However, some archaeal genomes encode MutS1 and MutL homologs, and their molecular functions have not been revealed. In this study, we purified and characterized recombinant MutS1 and the C-terminal endonuclease domain of MutL from a methanogenic archaeon Methanosaeta thermophila (mtMutS1 and the mtMutL CTD, respectively). mtMutS1 bound to mismatched DNAs with a higher affinity than to perfectly-matched and other structured DNAs, which resembles the DNA-binding specificities of eukaryotic and bacterial MutS1 homologs. The mtMutL CTD showed a Mn2+/Ni2+/Co2+-dependent nicking endonuclease activity that introduces single-strand breaks into a circular double-stranded DNA. The nicking endonuclease activity of the mtMutL CTD was impaired by mutagenizing the metal-binding motif that is identical to those of eukaryotic and bacterial MutL endonucleases. These results raise the possibility that not only the EndoMS-dependent MMR but also the traditional MutS1/MutL-dependent MMR exist in archaea.
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Affiliation(s)
- Ai Minobe
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, 200 Otsu, Monobe, Nankoku, Kochi, 783-8502, Japan
| | - Kenji Fukui
- Department of Biochemistry, Osaka Medical College, 2-7 Daigakumachi, Takatsuki, Osaka, 569-8686, Japan
| | - Hitomi Yonezu
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, 200 Otsu, Monobe, Nankoku, Kochi, 783-8502, Japan
| | - Koki Ohshita
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, 200 Otsu, Monobe, Nankoku, Kochi, 783-8502, Japan
| | - Saki Mizobuchi
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, 200 Otsu, Monobe, Nankoku, Kochi, 783-8502, Japan
| | - Takashi Morisawa
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, 200 Otsu, Monobe, Nankoku, Kochi, 783-8502, Japan
| | - Yuichi Hakumai
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, 200 Otsu, Monobe, Nankoku, Kochi, 783-8502, Japan
| | - Takato Yano
- Department of Biochemistry, Osaka Medical College, 2-7 Daigakumachi, Takatsuki, Osaka, 569-8686, Japan
| | - Makoto Ashiuchi
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, 200 Otsu, Monobe, Nankoku, Kochi, 783-8502, Japan
| | - Taisuke Wakamatsu
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, 200 Otsu, Monobe, Nankoku, Kochi, 783-8502, Japan.
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11
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Burby PE, Simmons LA. A bacterial DNA repair pathway specific to a natural antibiotic. Mol Microbiol 2018; 111:338-353. [PMID: 30379365 DOI: 10.1111/mmi.14158] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/28/2018] [Indexed: 12/17/2022]
Abstract
All organisms possess DNA repair pathways that are used to maintain the integrity of their genetic material. Although many DNA repair pathways are well understood, new pathways continue to be discovered. Here, we report an antibiotic specific DNA repair pathway in Bacillus subtilis that is composed of a previously uncharacterized helicase (mrfA) and exonuclease (mrfB). Deletion of mrfA and mrfB results in sensitivity to the DNA damaging agent mitomycin C, but not to any other type of DNA damage tested. We show that MrfAB function independent of canonical nucleotide excision repair, forming a novel excision repair pathway. We demonstrate that MrfB is a metal-dependent exonuclease and that the N-terminus of MrfB is required for interaction with MrfA. We determined that MrfAB failed to unhook interstrand cross-links in vivo, suggesting that MrfAB are specific to the monoadduct or the intrastrand cross-link. A phylogenetic analysis uncovered MrfAB homologs in diverse bacterial phyla, and cross-complementation indicates that MrfAB function is conserved in closely related species. B. subtilis is a soil dwelling organism and mitomycin C is a natural antibiotic produced by the soil bacterium Streptomyces lavendulae. The specificity of MrfAB suggests that these proteins are an adaptation to environments with mitomycin producing bacteria.
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Affiliation(s)
- Peter E Burby
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Lyle A Simmons
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA
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12
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Fukui K, Harada A, Wakamatsu T, Minobe A, Ohshita K, Ashiuchi M, Yano T. The GIY-YIG endonuclease domain of Arabidopsis MutS homolog 1 specifically binds to branched DNA structures. FEBS Lett 2018; 592:4066-4077. [PMID: 30372520 DOI: 10.1002/1873-3468.13279] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 10/16/2018] [Accepted: 10/24/2018] [Indexed: 01/18/2023]
Abstract
In plant organelle genomes, homeologous recombination between heteroallelic positions of repetitive sequences is increased by dysfunction of the gene encoding MutS homolog 1 (MSH1), a plant organelle-specific homolog of bacterial mismatch-binding protein MutS1. The C-terminal region of plant MSH1 contains the GIY-YIG endonuclease motif. The biochemical characteristics of plant MSH1 have not been investigated; accordingly, the molecular mechanism by which plant MSH1 suppresses homeologous recombination is unknown. Here, we characterized the recombinant GIY-YIG domain of Arabidopsis thaliana MSH1, showing that the domain possesses branched DNA-specific DNA-binding activity. Interestingly, the domain exhibited no endonuclease activity, suggesting that the mismatch-binding domain is required for DNA incision. Based on these results, we propose a possible mechanism for MSH1-dependent suppression of homeologous recombination.
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Affiliation(s)
- Kenji Fukui
- Department of Biochemistry, Osaka Medical College, Takatsuki, Japan
| | - Akiko Harada
- Department of Biology, Osaka Medical College, Takatsuki, Japan
| | - Taisuke Wakamatsu
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, Nankoku, Japan
| | - Ai Minobe
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, Nankoku, Japan
| | - Koki Ohshita
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, Nankoku, Japan
| | - Makoto Ashiuchi
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, Nankoku, Japan
| | - Takato Yano
- Department of Biochemistry, Osaka Medical College, Takatsuki, Japan
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13
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Ohshita K, Fukui K, Sato M, Morisawa T, Hakumai Y, Morono Y, Inagaki F, Yano T, Ashiuchi M, Wakamatsu T. Archaeal MutS5 tightly binds to Holliday junction similarly to eukaryotic MutSγ. FEBS J 2017; 284:3470-3483. [PMID: 28834211 DOI: 10.1111/febs.14204] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Revised: 07/28/2017] [Accepted: 08/17/2017] [Indexed: 01/15/2023]
Abstract
Archaeal DNA recombination mechanism and the related proteins are similar to those in eukaryotes. However, no functional homolog of eukaryotic MutSγ, which recognizes Holliday junction to promote homologous recombination, has been identified in archaea. Hence, the whole molecular mechanism of archaeal homologous recombination has not yet been revealed. In this study, to identify the archaeal functional homolog of MutSγ, we focused on a functionally uncharacterized MutS homolog, MutS5, from a hyperthermophilic archaeon Pyrococcus horikoshii (phMutS5). Archaeal MutS5 has a Walker ATPase motif-containing amino acid sequence that shows similarity to the ATPase domain of MutSγ. It is known that the ATPase domain of MutS homologs is also a dimerization domain. Chemical cross-linking revealed that purified phMutS5 has an ability to dimerize in solution. phMutS5 bound to Holliday junction with a higher affinity than to other branched and linear DNAs, which resembles the DNA-binding specificities of MutSγ and bacterial MutS2, a Holliday junction-resolving MutS homolog. However, phMutS5 has no nuclease activity against branched DNA unlike MutS2. The ATPase activity of phMutS5 was significantly stimulated by the presence of Holliday junction similarly to MutSγ. Furthermore, site-directed mutagenesis revealed that the ATPase activity is dependent on the Walker ATPase motif of the protein. These results suggest that archaeal MutS5 should stabilize the Holliday junction and play a role in homologous recombination, which is analogous to the function of eukaryotic MutSγ.
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Affiliation(s)
- Koki Ohshita
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, Nankoku, Japan
| | - Kenji Fukui
- Department of Biochemistry, Osaka Medical College, Takatsuki, Japan
| | - Mizuki Sato
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, Nankoku, Japan
| | - Takashi Morisawa
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, Nankoku, Japan
| | - Yuichi Hakumai
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, Nankoku, Japan
| | - Yuki Morono
- Geomicrobiology Group, Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Nankoku, Japan.,Geobio-Engineering and Technology Group, Submarine Resources Research Project, JAMSTEC, Nankoku, Japan
| | - Fumio Inagaki
- Geomicrobiology Group, Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Nankoku, Japan.,Geobio-Engineering and Technology Group, Submarine Resources Research Project, JAMSTEC, Nankoku, Japan.,Research and Development Center for Ocean Drilling Science, Yokohama, Japan
| | - Takato Yano
- Department of Biochemistry, Osaka Medical College, Takatsuki, Japan
| | - Makoto Ashiuchi
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, Nankoku, Japan
| | - Taisuke Wakamatsu
- Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, Nankoku, Japan
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14
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Molecular basis for the functions of a bacterial MutS2 in DNA repair and recombination. DNA Repair (Amst) 2017; 57:161-170. [PMID: 28800560 DOI: 10.1016/j.dnarep.2017.07.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 06/08/2017] [Accepted: 07/11/2017] [Indexed: 02/06/2023]
Abstract
Bacterial MutS2 proteins, consisting of functional domains for ATPase, DNA-binding, and nuclease activities, play roles in DNA recombination and repair. Here we observe a mechanism for generating MutS2 expression diversity in the human pathogen Helicobacter pylori, and identify a unique MutS2 domain responsible for specific DNA-binding. H. pylori strains differ in mutS2 expression due to variations in the DNA upstream sequence containing short sequence repeats. Based on Western blots, mutS2 in some strains appears to be co-translated with the upstream gene, but in other strains (e.g. UA948) such translational coupling does not occur. Accordingly, strain UA948 had phenotypes similar to its ΔmutS2 derivative, whereas expression of MutS2 at a separate locus in UA948 (the genetically complemented strain) displayed a lower mutation rate and lower transformation frequency than did ΔmutS2. A series of truncated HpMutS2 proteins were purified and tested for their specific abilities to bind 8-oxoG-containing DNA (GO:C) and Holiday Junction structures (HJ). The specific DNA binding domain was localized to an area adjacent to the Smr nuclease domain, and it encompasses 30-amino-acid-residues containing a "KPPKNKFKPPK" motif. Gel shift assays and competition assays supported that a truncated version of HpMutS2-C12 (∼12kDa protein containing the specific DNA-binding domain) has much greater capacity to bind to HJ or GO:C DNA than to normal double stranded DNA. By studying the in vivo roles of the separate domains of HpMutS2, we observed that the truncated versions were unable to complement the ΔmutS2 strain, suggesting the requirement for coordinated function of all the domains in vivo.
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15
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Abstract
Numerous attempts have been made to identify and engineer sequence-specific RNA endonucleases, as these would allow for efficient RNA manipulation. However, no natural RNA endonuclease that recognizes RNA in a sequence-specific manner has been described to date. Here, we report that SUPPRESSOR OF THYLAKOID FORMATION 1 (SOT1), an Arabidopsis pentatricopeptide repeat (PPR) protein with a small MutS-related (SMR) domain, has RNA endonuclease activity. We show that the SMR moiety of SOT1 performs the endonucleolytic maturation of 23S and 4.5S rRNA through the PPR domain, specifically recognizing a 13-nucleotide RNA sequence in the 5' end of the chloroplast 23S-4.5S rRNA precursor. In addition, we successfully engineered the SOT1 protein with altered PPR motifs to recognize and cleave a predicted RNA substrate. Our findings point to SOT1 as an exciting tool for RNA manipulation.
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16
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Burby PE, Simmons LA. MutS2 Promotes Homologous Recombination in Bacillus subtilis. J Bacteriol 2017; 199:e00682-16. [PMID: 27799325 PMCID: PMC5198493 DOI: 10.1128/jb.00682-16] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 10/21/2016] [Indexed: 02/07/2023] Open
Abstract
Bacterial MutS proteins are subdivided into two families, MutS1 and MutS2. MutS1 family members recognize DNA replication errors during their participation in the well-characterized mismatch repair (MMR) pathway. In contrast to the well-described function of MutS1, the function of MutS2 in bacteria has remained less clear. In Helicobacter pylori and Thermus thermophilus, MutS2 has been shown to suppress homologous recombination. The role of MutS2 is unknown in the Gram-positive bacterium Bacillus subtilis In this work, we investigated the contribution of MutS2 to maintaining genome integrity in B. subtilis We found that deletion of mutS2 renders B. subtilis sensitive to the natural antibiotic mitomycin C (MMC), which requires homologous recombination for repair. We demonstrate that the C-terminal small MutS-related (Smr) domain is necessary but not sufficient for tolerance to MMC. Further, we developed a CRISPR/Cas9 genome editing system to test if the inducible prophage PBSX was the underlying cause of the observed MMC sensitivity. Genetic analysis revealed that MMC sensitivity was dependent on recombination and not on nucleotide excision repair or a symptom of prophage PBSX replication and cell lysis. We found that deletion of mutS2 resulted in decreased transformation efficiency using both plasmid and chromosomal DNA. Further, deletion of mutS2 in a strain lacking the Holliday junction endonuclease gene recU resulted in increased MMC sensitivity and decreased transformation efficiency, suggesting that MutS2 could function redundantly with RecU. Together, our results support a model where B. subtilis MutS2 helps to promote homologous recombination, demonstrating a new function for bacterial MutS2. IMPORTANCE Cells contain pathways that promote or inhibit recombination. MutS2 homologs are Smr-endonuclease domain-containing proteins that have been shown to function in antirecombination in some bacteria. We present evidence that B. subtilis MutS2 promotes recombination, providing a new function for MutS2. We found that cells lacking mutS2 are sensitive to DNA damage that requires homologous recombination for repair and have reduced transformation efficiency. Further analysis indicates that the C-terminal Smr domain requires the N-terminal portion of MutS2 for function in vivo Moreover, we show that a mutS2 deletion is additive with a recU deletion, suggesting that these proteins have a redundant function in homologous recombination. Together, our study shows that MutS2 proteins have adapted different functions that impact recombination.
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Affiliation(s)
- Peter E Burby
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan, USA
| | - Lyle A Simmons
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan, USA
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17
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Damke PP, Dhanaraju R, Marsin S, Radicella JP, Rao DN. Mutations in the nucleotide binding and hydrolysis domains of Helicobacter pylori MutS2 lead to altered biochemical activities and inactivation of its in vivo function. BMC Microbiol 2016; 16:14. [PMID: 26843368 PMCID: PMC4739419 DOI: 10.1186/s12866-016-0629-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Accepted: 01/22/2016] [Indexed: 12/17/2022] Open
Abstract
Background Helicobacter pylori MutS2 (HpMutS2), an inhibitor of recombination during transformation is a non-specific nuclease with two catalytic sites, both of which are essential for its anti-recombinase activity. Although HpMutS2 belongs to a highly conserved family of ABC transporter ATPases, the role of its ATP binding and hydrolysis activities remains elusive. Results To explore the putative role of ATP binding and hydrolysis activities of HpMutS2 we specifically generated point mutations in the nucleotide-binding Walker-A (HpMutS2-G338R) and hydrolysis Walker-B (HpMutS2-E413A) domains of the protein. Compared to wild-type protein, HpMutS2-G338R exhibited ~2.5-fold lower affinity for both ATP and ADP while ATP hydrolysis was reduced by ~3-fold. Nucleotide binding efficiencies of HpMutS2-E413A were not significantly altered; however the ATP hydrolysis was reduced by ~10-fold. Although mutations in the Walker-A and Walker-B motifs of HpMutS2 only partially reduced its ability to bind and hydrolyze ATP, we demonstrate that these mutants not only exhibited alterations in the conformation, DNA binding and nuclease activities of the protein but failed to complement the hyper-recombinant phenotype displayed by mutS2-disrupted strain of H. pylori. In addition, we show that the nucleotide cofactor modulates the conformation, DNA binding and nuclease activities of HpMutS2. Conclusions These data describe a strong crosstalk between the ATPase, DNA binding, and nuclease activities of HpMutS2. Furthermore these data show that both, ATP binding and hydrolysis activities of HpMutS2 are essential for the in vivo anti-recombinase function of the protein. Electronic supplementary material The online version of this article (doi:10.1186/s12866-016-0629-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Prashant P Damke
- Department of Biochemistry, Indian Institute of Science, Bangalore, 560012, India
| | - Rajkumar Dhanaraju
- Department of Biochemistry, Indian Institute of Science, Bangalore, 560012, India
| | - Stéphanie Marsin
- CEA, Institute of Cellular and Molecular Radiobiology, Fontenay aux Roses, France.,INSERM UMR967, Fontenay aux Roses, France.,Universités Paris Diderot et Paris Sud, Fontenay aux Roses, France
| | - J Pablo Radicella
- CEA, Institute of Cellular and Molecular Radiobiology, Fontenay aux Roses, France. .,INSERM UMR967, Fontenay aux Roses, France. .,Universités Paris Diderot et Paris Sud, Fontenay aux Roses, France.
| | - Desirazu N Rao
- Department of Biochemistry, Indian Institute of Science, Bangalore, 560012, India.
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