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Updated: Jun 15, 2025

Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria
12:57

Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria

Published on: September 16, 2013

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Characterization of a secondary palmitoleoyltransferase of lipid A in Vibrio parahaemolyticus

Danyang Huang1, Lingyan Chen2, Zhe Wang3

  • 1State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China; Ningbo Institute of Marine Medicine Peking University, Ningbo 315832, China.

Enzyme and Microbial Technology
|August 27, 2024
PubMed

Insights

Researchers identified a new enzyme in Vibrio parahaemolyticus that adds a specific fatty acid to lipid A. This enzyme

Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Lipid Biochemistry

Background:

  • Lipid A is crucial for Gram-negative bacteria, influencing pathogenicity and immunogenicity.
  • Vibrio parahaemolyticus exhibits diverse lipid A structures due to variable acylation.
  • Understanding lipid A modification is key to controlling bacterial virulence and food safety.

Purpose of the Study:

  • To identify and characterize a novel secondary acyltransferase involved in lipid A biosynthesis in Vibrio parahaemolyticus.
  • To elucidate the specific function and regulatory mechanisms of the identified acyltransferase, VP_RS08405.
  • To investigate the role of VP_RS08405 in the structural diversity of Vibrio parahaemolyticus lipid A.

Main Methods:

  • Sequence homology analysis to identify potential lipid A acyltransferases.
  • Gene cloning and expression in Escherichia coli mutant strains lacking specific acyltransferases.
  • High-performance liquid chromatography-tandem mass spectrometry and thin-layer chromatography for lipid A structural analysis.
  • Functional assays to determine enzyme activity and dependence on 2-keto-3-deoxy-manno-octulosonic acid (Kdo).

Main Results:

  • VP_RS08405 was identified as a secondary acyltransferase in Vibrio parahaemolyticus.
  • VP_RS08405 specifically catalyzes the addition of palmitoleate to the 2'-position of lipid A.
  • The enzyme's activity is independent of temperature.
  • VP_RS08405 function is dependent on Kdo, indicating its role in the Kdo-dependent pathway of lipid A biosynthesis.

Conclusions:

  • VP_RS08405 is a novel Kdo-dependent secondary acyltransferase in Vibrio parahaemolyticus.
  • This enzyme contributes to the structural diversity of lipid A by adding a specific acyl chain.
  • Findings enhance understanding of Vibrio parahaemolyticus lipid A biosynthesis and its implications for pathogenicity.
Keywords:
Escherichia coliLipid ALipopolysaccharidePalmitoleateSecondary acyltransferaseVibrio parahaemolyticus

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