Structural basis for the acyl chain selectivity and mechanism of UDP- N -acetylglucosamine acyltransferase
Open accessAbstract
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).”
From <i>Bacteroides vulgatus</i> and <i>Bacteroides dorei</i> Reduce Gut Microbial Lipopolysaccharide Production and Inhibit Atherosclerosis (2018) · cites this paper as [38]
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- Authors
- Williams, A. H., & Raetz, C. R. H.
- Affiliations
- Duke Medical Center (US)
- Corresponding author
- Raetz, Christian R. H.
- ORCID
- Williams, Allison H.
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2007-08-21
- Volume
- 104
- Issue
- 34
- Pages
- 13543-13550
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC1959417
- 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
- green
- www.ncbi.nlm.nih.gov
- 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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