Deinococcus radiodurans' SRA-HNH domain containing protein Shp (Dr1533) is involved in faithful genome inheritance maintenance following DNA damage

Deinococcus radiodurans R1 (DR) survives conditions of extreme desiccation, irradiation and exposure to genotoxic chemicals, due to efficient DNA breaks repair, also through Mn2+ protection of DNA repair enzymes. Possible annotated domains of the DR1533 locus protein (Shp) were searched by bioinform...

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Veröffentlicht in:Biochimica et biophysica acta. General subjects 2019-01, Vol.1863 (1), p.118-129
Hauptverfasser: Ferrandi, Alex, Castani, Federica, Pitaro, Mauro, Tagliaferri, Sara, de la Tour, Claire Bouthier, Alduina, Rosa, Sommer, Suzanne, Fasano, Mauro, Barbieri, Paola, Mancini, Monica, Bonapace, Ian Marc
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container_title Biochimica et biophysica acta. General subjects
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creator Ferrandi, Alex
Castani, Federica
Pitaro, Mauro
Tagliaferri, Sara
de la Tour, Claire Bouthier
Alduina, Rosa
Sommer, Suzanne
Fasano, Mauro
Barbieri, Paola
Mancini, Monica
Bonapace, Ian Marc
description Deinococcus radiodurans R1 (DR) survives conditions of extreme desiccation, irradiation and exposure to genotoxic chemicals, due to efficient DNA breaks repair, also through Mn2+ protection of DNA repair enzymes. Possible annotated domains of the DR1533 locus protein (Shp) were searched by bioinformatic analysis. The gene was cloned and expressed as fusion protein. Band-shift assays of Shp or the SRA and HNH domains were performed on oligonucleotides, genomic DNA from E. coli and DR. shp knock-out mutant was generated by homologous recombination with a kanamycin resistance cassette. DR1533 contains an N-terminal SRA domain and a C-terminal HNH motif (SRA-HNH Protein, Shp). Through its SRA domain, Shp binds double-strand oligonucleotides containing 5mC and 5hmC, but also unmethylated and mismatched cytosines in presence of Mn2+. Shp also binds to Escherichia coli dcm+ genomic DNA, and to cytosine unmethylated DR and E. coli dcm− genomic DNAs, but only in presence of Mn2+. Under these binding conditions, Shp displays DNAse activity through its HNH domain. Shp KO enhanced >100 fold the number of spontaneous mutants, whilst the treatment with DNA double strand break inducing agents enhanced up to 3-log the number of survivors. The SRA-HNH containing protein Shp binds to and cuts 5mC DNA, and unmethylated DNA in a Mn2+ dependent manner, and might be involved in faithful genome inheritance maintenance following DNA damage. Our results provide evidence for a potential role of DR Shp protein for genome integrity maintenance, following DNA double strand breaks induced by genotoxic agents. •Dr1533 protein of D. radiodurans R1 (DR) contains a SRA and a HNH domain (Shp).•Shp binds to and cuts unmethylated E. coli and DR genomic DNA in presence of Mn2+.•shp-KO (Δshp) enhances DR survival after DNA damage induced by genotoxic agents.•Δshp increases the number of mutants in DR exposed to genotoxic agents.
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Possible annotated domains of the DR1533 locus protein (Shp) were searched by bioinformatic analysis. The gene was cloned and expressed as fusion protein. Band-shift assays of Shp or the SRA and HNH domains were performed on oligonucleotides, genomic DNA from E. coli and DR. shp knock-out mutant was generated by homologous recombination with a kanamycin resistance cassette. DR1533 contains an N-terminal SRA domain and a C-terminal HNH motif (SRA-HNH Protein, Shp). Through its SRA domain, Shp binds double-strand oligonucleotides containing 5mC and 5hmC, but also unmethylated and mismatched cytosines in presence of Mn2+. Shp also binds to Escherichia coli dcm+ genomic DNA, and to cytosine unmethylated DR and E. coli dcm− genomic DNAs, but only in presence of Mn2+. Under these binding conditions, Shp displays DNAse activity through its HNH domain. Shp KO enhanced &gt;100 fold the number of spontaneous mutants, whilst the treatment with DNA double strand break inducing agents enhanced up to 3-log the number of survivors. The SRA-HNH containing protein Shp binds to and cuts 5mC DNA, and unmethylated DNA in a Mn2+ dependent manner, and might be involved in faithful genome inheritance maintenance following DNA damage. Our results provide evidence for a potential role of DR Shp protein for genome integrity maintenance, following DNA double strand breaks induced by genotoxic agents. •Dr1533 protein of D. radiodurans R1 (DR) contains a SRA and a HNH domain (Shp).•Shp binds to and cuts unmethylated E. coli and DR genomic DNA in presence of Mn2+.•shp-KO (Δshp) enhances DR survival after DNA damage induced by genotoxic agents.•Δshp increases the number of mutants in DR exposed to genotoxic agents.</description><identifier>ISSN: 0304-4165</identifier><identifier>EISSN: 1872-8006</identifier><identifier>DOI: 10.1016/j.bbagen.2018.09.020</identifier><identifier>PMID: 30308220</identifier><language>eng</language><publisher>Netherlands: Elsevier B.V</publisher><subject>Amino Acid Sequence ; Bacterial Proteins - genetics ; Bacterial Proteins - metabolism ; CCAAT-Enhancer-Binding Proteins - metabolism ; Cloning, Molecular ; Computational Biology ; Cytosine - metabolism ; Deinococcus - genetics ; Deinococcus - metabolism ; DNA cytosine-methylation ; DNA Damage ; DNA Methylation ; DNA Repair ; DNA, Bacterial - genetics ; DR1533 locus ; Drug Resistance, Bacterial ; Escherichia coli - genetics ; Escherichia coli - metabolism ; Genome, Bacterial ; Genotoxic agents ; Humans ; Kanamycin - chemistry ; Life Sciences ; Mn2 ; Mutagens - chemistry ; Mutation ; Protein Domains ; SRA domain</subject><ispartof>Biochimica et biophysica acta. 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General subjects</jtitle><addtitle>Biochim Biophys Acta Gen Subj</addtitle><date>2019-01</date><risdate>2019</risdate><volume>1863</volume><issue>1</issue><spage>118</spage><epage>129</epage><pages>118-129</pages><issn>0304-4165</issn><eissn>1872-8006</eissn><abstract>Deinococcus radiodurans R1 (DR) survives conditions of extreme desiccation, irradiation and exposure to genotoxic chemicals, due to efficient DNA breaks repair, also through Mn2+ protection of DNA repair enzymes. Possible annotated domains of the DR1533 locus protein (Shp) were searched by bioinformatic analysis. The gene was cloned and expressed as fusion protein. Band-shift assays of Shp or the SRA and HNH domains were performed on oligonucleotides, genomic DNA from E. coli and DR. shp knock-out mutant was generated by homologous recombination with a kanamycin resistance cassette. DR1533 contains an N-terminal SRA domain and a C-terminal HNH motif (SRA-HNH Protein, Shp). Through its SRA domain, Shp binds double-strand oligonucleotides containing 5mC and 5hmC, but also unmethylated and mismatched cytosines in presence of Mn2+. Shp also binds to Escherichia coli dcm+ genomic DNA, and to cytosine unmethylated DR and E. coli dcm− genomic DNAs, but only in presence of Mn2+. Under these binding conditions, Shp displays DNAse activity through its HNH domain. Shp KO enhanced &gt;100 fold the number of spontaneous mutants, whilst the treatment with DNA double strand break inducing agents enhanced up to 3-log the number of survivors. The SRA-HNH containing protein Shp binds to and cuts 5mC DNA, and unmethylated DNA in a Mn2+ dependent manner, and might be involved in faithful genome inheritance maintenance following DNA damage. Our results provide evidence for a potential role of DR Shp protein for genome integrity maintenance, following DNA double strand breaks induced by genotoxic agents. •Dr1533 protein of D. radiodurans R1 (DR) contains a SRA and a HNH domain (Shp).•Shp binds to and cuts unmethylated E. coli and DR genomic DNA in presence of Mn2+.•shp-KO (Δshp) enhances DR survival after DNA damage induced by genotoxic agents.•Δshp increases the number of mutants in DR exposed to genotoxic agents.</abstract><cop>Netherlands</cop><pub>Elsevier B.V</pub><pmid>30308220</pmid><doi>10.1016/j.bbagen.2018.09.020</doi><tpages>12</tpages></addata></record>
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source MEDLINE; Elsevier ScienceDirect Journals Complete
subjects Amino Acid Sequence
Bacterial Proteins - genetics
Bacterial Proteins - metabolism
CCAAT-Enhancer-Binding Proteins - metabolism
Cloning, Molecular
Computational Biology
Cytosine - metabolism
Deinococcus - genetics
Deinococcus - metabolism
DNA cytosine-methylation
DNA Damage
DNA Methylation
DNA Repair
DNA, Bacterial - genetics
DR1533 locus
Drug Resistance, Bacterial
Escherichia coli - genetics
Escherichia coli - metabolism
Genome, Bacterial
Genotoxic agents
Humans
Kanamycin - chemistry
Life Sciences
Mn2
Mutagens - chemistry
Mutation
Protein Domains
SRA domain
title Deinococcus radiodurans' SRA-HNH domain containing protein Shp (Dr1533) is involved in faithful genome inheritance maintenance following DNA damage
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