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Defining the mRNA recognition signature of a bacterial toxin protein

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
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  1. Emory Univ., Atlanta, GA (United States). School of Medicine. Dept. of Biochemistry
Bacteria contain multiple type II toxins that selectively degrade mRNAs bound to the ribosome to regulate translation and growth and facilitate survival during the stringent response. Ribosome-dependent toxins recognize a variety of three-nucleotide codons within the aminoacyl (A) site, but how these endonucleases achieve substrate specificity remains poorly understood. In this paper, we identify the critical features for how the host inhibition of growth B (HigB) toxin recognizes each of the three A-site nucleotides for cleavage. X-ray crystal structures of HigB bound to two different codons on the ribosome illustrate how HigB uses a microbial RNase-like nucleotide recognition loop to recognize either cytosine or adenosine at the second A-site position. Strikingly, a single HigB residue and 16S rRNA residue C1054 form an adenosine-specific pocket at the third A-site nucleotide, in contrast to how tRNAs decode mRNA. Finally, our results demonstrate that the most important determinant for mRNA cleavage by ribosome-dependent toxins is interaction with the third A-site nucleotide.
Research Organization:
Emory Univ., Atlanta, GA (United States)
Sponsoring Organization:
National Inst. of Health (NIH) (United States); National Science Foundation (NSF) (United States); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1226369
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 45 Vol. 112; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH

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Cited By (12)

The HigB/HigA toxin/antitoxin system of Pseudomonas aeruginosa influences the virulence factors pyochelin, pyocyanin, and biofilm formation journal March 2016
A dual role in regulation and toxicity for the disordered N-terminus of the toxin GraT journal February 2019
Mechanism of endonuclease cleavage by the HigB toxin journal July 2016
Ribosome-dependent Vibrio cholerae mRNAse HigB2 is regulated by a β-strand sliding mechanism journal February 2017
HigB of Pseudomonas aeruginosa Enhances Killing of Phagocytes by Up-Regulating the Type III Secretion System in Ciprofloxacin Induced Persister Cells journal October 2016
Structural Insights Into the Transcriptional Regulation of HigBA Toxin–Antitoxin System by Antitoxin HigA in Pseudomonas aeruginosa journal January 2020
Toxin-antitoxin systems in bacterial growth arrest and persistence journal March 2016
Growth control switch by a DNA-damage-inducible toxin–antitoxin system in Caulobacter crescentus journal February 2016
Monomeric YoeB toxin retains RNase activity but adopts an obligate dimeric form for thermal stability journal September 2019
Structural basis of transcriptional regulation by the HigA antitoxin journal April 2019
Wake me when it’s over – Bacterial toxin–antitoxin proteins and induced dormancy journal May 2016
mRNA bound to the 30S subunit is a HigB toxin substrate journal June 2016

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