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-Structure paper
タイトル | PglZ from Type I BREX phage defence systems is a metal-dependent nuclease that forms a sub-complex with BrxB. |
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ジャーナル・号・ページ | Nucleic Acids Res, Vol. 53, Issue 12, Year 2025 |
掲載日 | 2025年6月20日 |
![]() | Jennifer J Readshaw / Lindsey A Doyle / Maria Puiu / Abigail Kelly / Andrew Nelson / Alex J Kaiser / Sydney F McGuire / Julieta Peralta Acosta / Darren L Smith / Barry L Stoddard / Brett K Kaiser / Tim R Blower / ![]() ![]() |
PubMed 要旨 | BREX (Bacteriophage Exclusion) systems, identified through shared identity with Pgl (Phage Growth Limitation) systems, are a widespread, highly diverse group of phage defence systems found throughout ...BREX (Bacteriophage Exclusion) systems, identified through shared identity with Pgl (Phage Growth Limitation) systems, are a widespread, highly diverse group of phage defence systems found throughout bacteria and archaea. The varied BREX Types harbour multiple protein subunits (between four and eight) and all encode a conserved putative phosphatase, PglZ, and an equally conserved, putative ATPase, BrxC. Almost all BREX systems also contain a site-specific methyltransferase, PglX. Despite having determined the structure and fundamental biophysical and biochemical behaviours of several BREX factors (including the PglX methyltransferase, the BrxL effector, the BrxA DNA-binding protein, and a commonly-associated transcriptional regulator, BrxR), the mechanism by which BREX impedes phage replication remains largely undetermined. In this study, we identified a stable BREX sub-complex of PglZ:BrxB, generated and validated a structural model of that protein complex, and assessed the biochemical activity of PglZ from BREX, revealing it to be a metal-dependent nuclease. PglZ can cleave cyclic oligonucleotides, linear oligonucleotides, plasmid DNA and both non-modified and modified linear phage genomes. PglZ nuclease activity has no obvious role in BREX-dependent methylation, but does contribute to BREX phage defence. BrxB binding does not impact PglZ nuclease activity. These data contribute to our growing understanding of BREX phage defence. |
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手法 | EM (単粒子) |
解像度 | 4.45 Å |
構造データ | EMDB-49827: Complex of BREX proteins BrxB and PglZ from Salmonella typhimurium |
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![]() | ANTIMICROBIAL PROTEIN / Restriction / Bacteriophage / Defense / BREX / Salmonella typhimurium / Salmonella / AlphaFold |