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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.
Pubmed ID: 30711824
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Collection of microbial resources and perform taxonomic characterization of individual microorganisms such as bacteria including actinomycetes and archaea, yeasts, fungi, algaes, bacteriophages and DNA resources for academic research and industrial applications. NBRC is a member of WFCC, OECD Global BRC Network, ACM and JSCC. They are certified by quality management system ISO 9001. To provide attractive biological resources with useful information attached, they actively collect potentially useful biological resources (microorganisms and cloned genes) and distributes them to promote basic research as well as industrial applications. At the Biological Resource Center, they explore, isolate and identify microorganisms from various natural environments and at the same time accept scientifically and industrially useful microorganisms from researchers in academic and industrial sectors. The microbial DNA library constructed at the Biotechnology Development Center is also part of their collection. To improve and expand the collection, new methodologies for the isolation, identification and preservation of microorganisms and DNA will be investigated and developed so as to provide biological resources of higher quality. Their resources serve, for example, as the standard for determining antimicrobial activity, in aseptic tests as well as for the production of pharmaceutical substances and will be constantly reinforced for wider distribution to researchers in academia and industries. Please refer to the catalog shown at the NBRC website for details.
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