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Convergent Evolution of the Barnase/EndoU/Colicin/RelE (BECR) Fold in Antibacterial tRNase Toxins.
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- Additional Information
- Source:
Publisher: Cell Press Country of Publication: United States NLM ID: 101087697 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1878-4186 (Electronic) Linking ISSN: 09692126 NLM ISO Abbreviation: Structure Subsets: MEDLINE
- Publication Information:
Publication: 2000- : Cambridge, Mass. : Cell Press
Original Publication: London : Current Biology, c1993-
- Subject Terms:
- Abstract:
Contact-dependent growth inhibition (CDI) is a form of interbacterial competition mediated by CdiB-CdiA two-partner secretion systems. CdiA effector proteins carry polymorphic C-terminal toxin domains (CdiA-CT), which are neutralized by specific CdiI immunity proteins to prevent self-inhibition. Here, we present the crystal structures of CdiA-CT⋅CdiI complexes from Klebsiella pneumoniae 342 and Escherichia coli 3006. The toxins adopt related folds that resemble the ribonuclease domain of colicin D, and both are isoacceptor-specific tRNases that cleave the acceptor stem of deacylated tRNA GAU Ile . Although the toxins are similar in structure and substrate specificity, CdiA-CT Kp342 activity requires translation factors EF-Tu and EF-Ts, whereas CdiA-CT EC3006 is intrinsically active. Furthermore, the corresponding immunity proteins are unrelated in sequence and structure. CdiI Kp342 forms a dimeric β sandwich, whereas CdiI EC3006 is an α-solenoid monomer. Given that toxin-immunity genes co-evolve as linked pairs, these observations suggest that the similarities in toxin structure and activity reflect functional convergence.
(Copyright © 2019 Elsevier Ltd. All rights reserved.)
- Comments:
Comment in: Structure. 2019 Nov 5;27(11):1613-1614. (PMID: 31693909)
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- Grant Information:
R01 GM117373 United States GM NIGMS NIH HHS; R24 GM115586 United States GM NIGMS NIH HHS; U01 GM102318 United States GM NIGMS NIH HHS; U54 GM094585 United States GM NIGMS NIH HHS
- Contributed Indexing:
Keywords: bacterial competition; toxin-antitoxin systems; two-partner secretion; type V secretion system
- Accession Number:
0 (Bacterial Proteins)
0 (Bacterial Toxins)
0 (CdiA protein, E coli)
0 (CdiB protein, E coli)
0 (Colicins)
0 (Escherichia coli Proteins)
0 (Membrane Proteins)
0 (RelE protein, E coli)
9014-25-9 (RNA, Transfer)
EC 3.1.- (Ribonucleases)
EC 3.1.27.- (Bacillus amyloliquefaciens ribonuclease)
- Publication Date:
Date Created: 20190914 Date Completed: 20200623 Latest Revision: 20201105
- Publication Date:
20240829
- Accession Number:
PMC6834915
- Accession Number:
10.1016/j.str.2019.08.010
- Accession Number:
31515004
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