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Caliandro, Rosanna; de Diego, Iñaki; Gomis-Rüth, F Xavier
Scientific reports, 03/2022, Letnik: 12, Številka: 1Journal Article
Bacillus subtilis is a commensal member of the human oral and gut microbiomes, which can become infectious to immunocompromised patients. It possesses a conjugative transposon, ICEBs1, which includes > 20 genes and can be passed by horizontal gene transfer to other bacteria, including pathogenic Bacillus anthracis and Listeria monocytogenes. ICEBs1 is regulated by the ImmR/ImmA tandem, which are a transcriptional repressor that constitutively blocks transcription and a metallopeptidase that acts as anti-repressor and inactivates ImmR by proteolytic cleavage. We here report the production and purification of 127-residue ImmR from ICEBs1 and the crystal structure of its DNA-binding domain. It features a five-helix bundle centred on a helix-turn-helix motif potentially binding the major grove of double-stranded target DNA. ImmR shows structural and mechanistic similarity with the B. subtilis SinR repressor, which is engaged in sporulation inhibition.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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