Cited by 88Enzyme Structure and FunctionCarbohydrate Chemistry and SynthesisLipid metabolism and biosynthesis

Structural basis for the acyl chain selectivity and mechanism of UDP- N -acetylglucosamine acyltransferase

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Williams, Allison H., Raetz, Christian R. H.·2007·Proceedings of the National Academy of Sciences

Abstract

UDP- N -acetylglucosamine (UDP-GlcNAc) acyltransferase (LpxA) catalyzes the first step of lipid A biosynthesis, the reversible transfer of the R -3-hydroxyacyl chain from R -3-hydroxyacyl acyl carrier protein to the glucosamine 3-OH group of UDP-GlcNAc. Escherichia coli LpxA is highly selective for R -3-hydroxymyristate. The crystal structure of the E. coli LpxA homotrimer, determined previously in the absence of lipid substrates or products, revealed that LpxA contains an unusual, left-handed parallel β-helix fold. We have now solved the crystal structures of E. coli LpxA with the bound product UDP-3- O -( R -3-hydroxymyristoyl)-GlcNAc at a resolution of 1.74 Å and with bound UDP-3- O -( R -3-hydroxydecanoyl)-GlcNAc at 1.85 Å. The structures of these complexes are consistent with the catalytic mechanism deduced by mutagenesis and with a recent 3.0-Å structure of LpxA with bound UDP-GlcNAc. Our structures show how LpxA selects for 14-carbon R -3-hydroxyacyl chains and reveal two modes of UDP binding.

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  • Expression of genes involved in lipopolysaccharide biosynthesis, especially LpxA and LpxD, was significantly decreased in mice gavaged with live Bacteroides.

    “the expression of genes involved in LPS biosynthesis, especially LpxA and LpxD, which are involved in lipid A biosynthesis and constitute the essential acyltransferases of the lipid A structure (Figure 3B), 38,39 was significantly decreased in mice gavaged with live Bacteroides (Figure 3A and 3C, Figure IV in the online-only Data Supplement).”

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Authors
Williams, A. H., & Raetz, C. R. H.
Affiliations
Duke Medical Center (US)
Corresponding author
Raetz, Christian R. H.
Venue
Proceedings of the National Academy of Sciences
Published
2007-08-21
Volume
104
Issue
34
Pages
13543-13550
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2052156598
Cited by
84
References
49
Citations by year
2026: 1 · 2025: 5 · 2024: 5 · 2023: 5 · 2022: 5 · 2021: 2 · 2020: 6 · 2019: 6 · 2018: 7 · 2017: 2 · 2016: 3 · 2015: 3 · 2014: 6 · 2013: 5 · 2012: 4
FWCI
3.13
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of General Medical Sciences (GM5-1310, R01GM051310)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
  • Physical Sciences › Chemistry › Organic Chemistry › Carbohydrate Chemistry and Synthesis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
Keywords
LpxA, lipid A biosynthesis, Escherichia coli, enzyme crystal structure
MeSH terms
Acylation, Acyltransferases, Binding Sites, Escherichia coli, Isoenzymes, Ligands, Lipids, Models, Molecular, Substrate Specificity, Uridine Diphosphate N-Acetylglucosamine, Protein Structure, Tertiary, Crystallography, X-Ray, Structural Homology, Protein, Lipid Metabolism

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