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Protection of the Queuosine Biosynthesis Enzyme QueF from Irreversible Oxidation by a Conserved Intramolecular Disulfide

Journal Article · · Biomolecules
DOI:https://doi.org/10.3390/biom7010030· OSTI ID:1628313
 [1];  [2];  [2];  [2];  [3];  [2];  [4];  [3]
  1. Western University of Health Sciences, Pomona, CA (United States); DOE/OSTI
  2. Portland State Univ., OR (United States)
  3. Western University of Health Sciences, Pomona, CA (United States)
  4. San Diego State Univ., CA (United States)

QueF enzymes catalyze the nicotinamide adenine dinucleotide phosphate (NADPH)-dependent reduction of the nitrile group of 7-cyano-7-deazaguanine (preQ0) to 7-aminomethyl-7-deazaguanine (preQ1) in the biosynthetic pathway to the tRNA modified nucleoside queuosine. The QueF-catalyzed reaction includes formation of a covalent thioimide intermediate with a conserved active site cysteine that is prone to oxidation in vivo. Here, we report the crystal structure of a mutant of Bacillus subtilis QueF, which reveals an unanticipated intramolecular disulfide formed between the catalytic Cys55 and a conserved Cys99 located near the active site. This structure is more symmetric than the substrate-bound structure and exhibits major rearrangement of the loops responsible for substrate binding. Mutation of Cys99 to Ala/Ser does not compromise enzyme activity, indicating that the disulfide does not play a catalytic role. Peroxide-induced inactivation of the wild-type enzyme is reversible with thioredoxin, while such inactivation of the Cys99Ala/Ser mutants is irreversible, consistent with protection of Cys55 from irreversible oxidation by disulfide formation with Cys99. Conservation of the cysteine pair, and the reported in vivo interaction of QueF with the thioredoxin-like hydroperoxide reductase AhpC in Escherichia coli suggest that regulation by the thioredoxin disulfide-thiol exchange system may constitute a general mechanism for protection of QueF from oxidative stress in vivo.

Research Organization:
SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF); National Institutes of Health (NIH); National Institute of General Medical Sciences (NIGMS)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1628313
Journal Information:
Biomolecules, Journal Name: Biomolecules Journal Issue: 4 Vol. 7; ISSN 2218-273X; ISSN BIOMHC
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

References (46)

Sequence and structural features of the T-fold, an original tunnelling building unit journal May 2000
Queuosine modification of the wobble base in tRNAHis influences ‘in vivo’ decoding properties. journal March 1985
Molecular and biological characterization of an isolate of the potyvirus passiflora virus Y naturally infecting soybean (Glycine max) in Brazil journal September 2022
High-Resolution Structure of the Nitrile Reductase QueF Combined with Molecular Simulations Provide Insight into Enzyme Mechanism journal November 2010
Biosynthesis of the 7-deazaguanosine hypermodified nucleosides of transfer RNA journal February 2003
Disulfide bonds as switches for protein function journal April 2003
Insight into Enzymatic Nitrile Reduction: QM/MM Study of the Catalytic Mechanism of QueF Nitrile Reductase journal May 2015
Possible anticodon sequences of tRNAHis, tRNAAsn, and tRNAAsp from Escherichia coli. Universal presence of nucleoside O in the first position of the anticodons of these transfer ribonucleic acid journal January 1972
Allosteric Disulfide Bonds journal June 2006
Mechanistic Studies of Bacillus subtilis QueF, the Nitrile Oxidoreductase Involved in Queuosine Biosynthesis journal November 2007
The Phyre2 web portal for protein modeling, prediction and analysis journal May 2015
Queuosine modification of tRNA: its divergent role in cellular machinery journal November 2009
From cyclohydrolase to oxidoreductase: Discovery of nitrile reductase activity in a common fold journal March 2005
Queuosine Deficiency in Eukaryotes Compromises Tyrosine Production through Increased Tetrahydrobiopterin Oxidation journal April 2011
Structural Basis of Biological Nitrile Reduction journal July 2012
Kinetic Analysis and Probing with Substrate Analogues of the Reaction Pathway of the Nitrile Reductase QueF from Escherichia coli journal October 2016
Identification of Four Genes Necessary for Biosynthesis of the Modified Nucleoside Queuosine journal December 2003
S- Bacillithiolation Protects Conserved and Essential Proteins Against Hypochlorite Stress in Firmicutes Bacteria journal April 2013
Post-Translational Control of Protein Function by Disulfide Bond Cleavage journal May 2013
TOPALi v2: a rich graphical interface for evolutionary analyses of multiple alignments on HPC clusters and multi-core desktops journal November 2008
Large-scale identification of protein-protein interaction of Escherichia coli K-12 journal May 2006
Likelihood-enhanced fast rotation functions journal February 2004
Coot model-building tools for molecular graphics journal November 2004
Refinement of Macromolecular Structures by the Maximum-Likelihood Method journal May 1997
Thiol-based mechanisms of the thioredoxin and glutaredoxin systems: implications for diseases in the cardiovascular system journal March 2007
Sequence and structural features of the T-fold, an original tunnelling building unit journal May 2000
Nitrile Reductase from Geobacillus kaustophilus: A Potential Catalyst for a New Nitrile Biotransformation Reaction journal July 2012
Targeting the Substrate Binding Site of E. coli Nitrile Reductase QueF by Modeling, Substrate and Enzyme Engineering journal April 2013
Effects of a Diet Deficient in Tyrosine and Queuine on Germfree Mice journal January 1997
Isolation and characterization of an Escherichia coli mutant lacking tRNA-guanine transglycosylase. Function and biosynthesis of queuosine in tRNA. journal June 1982
Biosynthesis of the 7-deazaguanosine hypermodified nucleosides of transfer RNA journal February 2003
[20] Processing of X-ray diffraction data collected in oscillation mode book January 1997
Disulfide bonds as switches for protein function journal April 2003
Expression and characterization of the nitrile reductase queF from E. coli journal March 2013
Why does the Aβ peptide of Alzheimer share structural similarity with antimicrobial peptides? journal March 2020
Queuosine modification of tRNA: its divergent role in cellular machinery journal November 2009
Queuosine Deficiency in Eukaryotes Compromises Tyrosine Production through Increased Tetrahydrobiopterin Oxidation journal April 2011
Structural Basis of Biological Nitrile Reduction journal July 2012
Kinetic Analysis and Probing with Substrate Analogues of the Reaction Pathway of the Nitrile Reductase QueF from Escherichia coli journal October 2016
Identification of Four Genes Necessary for Biosynthesis of the Modified Nucleoside Queuosine journal December 2003
MrBayes 3: Bayesian phylogenetic inference under mixed models journal August 2003
Jalview Version 2--a multiple sequence alignment editor and analysis workbench journal January 2009
Likelihood-enhanced fast rotation functions journal February 2004
Coot model-building tools for molecular graphics journal November 2004
Refinement of Macromolecular Structures by the Maximum-Likelihood Method journal May 1997
Crystallization and preliminary X-ray characterization of the nitrile reductase QueF: a queuosine-biosynthesis enzyme journal September 2005

Cited By (4)

Allosteric disulphide bonds as reversible mechano-sensitive switches that control protein functions in the vasculature journal May 2019
Interplay of nucleophilic catalysis with proton transfer in the nitrile reductase QueF from Escherichia coli journal January 2019
Evidence of a sequestered imine intermediate during reduction of nitrile to amine by the nitrile reductase QueF from Escherichia coli journal January 2018
Allosteric disulfides: Sophisticated molecular structures enabling flexible protein regulation journal January 2019