In vitro biosynthesis of the Pseudomonas aeruginosa quorum-sensing signal molecule N-butanoyl-L-homoserine lactone

被引:64
作者
Jiang, Y
Camara, M
Chhabra, SR
Hardie, KR
Bycroft, BW
Lazdunski, A
Salmond, GPC
Stewart, GSAB
Williams, P
机构
[1] Univ Nottingham, Dept Pharmaceut Sci, Nottingham NG7 2RD, England
[2] CNRS, Lab Ingn & Dynam Syst Membranaires, F-13402 Marseille 20, France
[3] Univ Cambridge, Dept Biochem, Cambridge CB2 1QW, England
关键词
D O I
10.1046/j.1365-2958.1998.00789.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
in Pseudomonas aeruginosa, synthesis of the quorum-sensing signal molecules N-butanoyl-L-homoserine lactone (BHL) and N-hexanoyl-L-homoserine lactone (HHL) requires the Luxl homologue RhII(VsmI). By using thin-layer chromatography in conjunction with high-performance liquid chromatography (HPLC) and mass spectrometry, we show that purified Rhll can catalyse the biosynthesis of BHL and HHL using either S-adenosylmethionine (SAM) or homoserine lactone (HSL) but not homoserine as the source of the homoserine lactone moiety, As we were unable to detect homoserine lactone in cytoplasmic extracts of Escherichia coli, we conclude that SAIVI is the natural substrate for RhII-directed N-acylhomoserine lactone (AHL) biosynthesis. The N-acyl chain of BHL and HHL can be supplied by the appropriately charged coenzyme A derivative (either n-butanoyl-CoA or n-hexanoyl-CoA), The specificity of Rhll for charged CoA derivatives is demonstrated as RhII was unable to generate AHLs detectable in our bioassays from acetyl-CoA, malonyl-CoA, n-octanoyl-CoA, n-decanoyl-CoA, DL-beta-hydroxybutanoyl-CoA or crotonoyl-CoA, Rhll was also unable to use N-acetyl-S-3-oxobutanoylcysteamine, a chemical mimic for 3-oxobutanoyl-CoA. Furthermore, the RhII-catalysed synthesis of BHL and HHL was most efficiently driven when NADPH was included in the reaction mixture.
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页码:193 / 203
页数:11
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