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Title: Structural insights into the catalytic mechanism of a sacrificial sulfur insertase of the N-type ATP pyrophosphatase family, LarE

Abstract

The lar operon in Lactobacillus plantarum encodes five Lar proteins (LarA/B/C/D/E) that collaboratively synthesize and incorporate a niacin-derived Ni-containing cofactor into LarA, an Ni-dependent lactate racemase. Previous studies have established that two molecules of LarE catalyze successive thiolation reactions by donating the sulfur atom of their exclusive cysteine residues to the substrate. Here, the catalytic mechanism of this very unusual sulfur-sacrificing reaction remains elusive. In this work, we present the crystal structures of LarE in ligand-free and several ligand-bound forms, demonstrating that LarE is a member of the N-type ATP pyrophosphatase (PPase) family with a conserved N-terminal ATP PPase domain and a unique C-terminal domain harboring the putative catalytic site. Structural analysis, combined with structure-guided mutagenesis, leads us to propose a catalytic mechanism that establishes LarE as a paradigm for sulfur transfer through sacrificing its catalytic cysteine residue.

Authors:
 [1];  [2]; ORCiD logo [1];  [1]
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Michigan State Univ., East Lansing, MI (United States); Univ. catholique de Louvain, Louvain-La-Neuve (Belgium)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF)
OSTI Identifier:
1419864
Grant/Contract Number:  
CHE-1516126
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 114; Journal Issue: 34; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences
Country of Publication:
United States
Language:
ENGLISH
Subject:
59 BASIC BIOLOGICAL SCIENCES; thiolation; ATP pyrophosphatase; crystal structure; Lar protein; catalysis

Citation Formats

Fellner, Matthias, Desguin, Benoît, Hausinger, Robert P., and Hu, Jian. Structural insights into the catalytic mechanism of a sacrificial sulfur insertase of the N-type ATP pyrophosphatase family, LarE. United States: N. p., 2017. Web. doi:10.1073/pnas.1704967114.
Fellner, Matthias, Desguin, Benoît, Hausinger, Robert P., & Hu, Jian. Structural insights into the catalytic mechanism of a sacrificial sulfur insertase of the N-type ATP pyrophosphatase family, LarE. United States. https://doi.org/10.1073/pnas.1704967114
Fellner, Matthias, Desguin, Benoît, Hausinger, Robert P., and Hu, Jian. 2017. "Structural insights into the catalytic mechanism of a sacrificial sulfur insertase of the N-type ATP pyrophosphatase family, LarE". United States. https://doi.org/10.1073/pnas.1704967114. https://www.osti.gov/servlets/purl/1419864.
@article{osti_1419864,
title = {Structural insights into the catalytic mechanism of a sacrificial sulfur insertase of the N-type ATP pyrophosphatase family, LarE},
author = {Fellner, Matthias and Desguin, Benoît and Hausinger, Robert P. and Hu, Jian},
abstractNote = {The lar operon in Lactobacillus plantarum encodes five Lar proteins (LarA/B/C/D/E) that collaboratively synthesize and incorporate a niacin-derived Ni-containing cofactor into LarA, an Ni-dependent lactate racemase. Previous studies have established that two molecules of LarE catalyze successive thiolation reactions by donating the sulfur atom of their exclusive cysteine residues to the substrate. Here, the catalytic mechanism of this very unusual sulfur-sacrificing reaction remains elusive. In this work, we present the crystal structures of LarE in ligand-free and several ligand-bound forms, demonstrating that LarE is a member of the N-type ATP pyrophosphatase (PPase) family with a conserved N-terminal ATP PPase domain and a unique C-terminal domain harboring the putative catalytic site. Structural analysis, combined with structure-guided mutagenesis, leads us to propose a catalytic mechanism that establishes LarE as a paradigm for sulfur transfer through sacrificing its catalytic cysteine residue.},
doi = {10.1073/pnas.1704967114},
url = {https://www.osti.gov/biblio/1419864}, journal = {Proceedings of the National Academy of Sciences of the United States of America},
issn = {0027-8424},
number = 34,
volume = 114,
place = {United States},
year = {Mon Aug 07 00:00:00 EDT 2017},
month = {Mon Aug 07 00:00:00 EDT 2017}
}

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Cited by: 22 works
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Works referenced in this record:

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Works referencing / citing this record:

Functional Models of the Nickel Pincer Nucleotide Cofactor of Lactate Racemase
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Functional Models of the Nickel Pincer Nucleotide Cofactor of Lactate Racemase
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Biosynthesis of the nickel-pincer nucleotide cofactor of lactate racemase requires a CTP-dependent cyclometallase
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A structural perspective on the PP-loop ATP pyrophosphatase family
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Targeting adenylate-forming enzymes with designed sulfonyladenosine inhibitors
journal, April 2019