Identification of three genes encoding for the late acyltransferases of lipid A in Cronobacter sakazakii.

Identification of three genes encoding for the late acyltransferases of lipid A in Cronobacter sakazakii.
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坂崎克罗诺杆菌中编码脂质 A 晚期酰基转移酶的三个基因的鉴定。

DOI:
10.3390/md11020377
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发表时间:
2013-01-31
期刊:
影响因子:
5.4
通讯作者:
Wang X
Wang X
中科院分区:
医学2区
文献类型:
--
作者:
Cai L;Li Y;Tao G;Guo W;Zhang C;Wang X

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脂类A是脂多糖的疏水锚,是大多数革兰氏阴性菌外膜的重要成分。食源性病原体Skazakii会合成两种脂类A,次级酰链的长度不同。在这项工作中,我们鉴定了3个基因ESA02293、ESA02951和ESA01386,这些基因编码Skazakii类脂A生物合成途径的晚期酰基转移酶。序列比对表明,ESA02293编码的YP001438378.1、ESA02951编码的YP001439016.1和ESA01386编码的YP001437482.1分别与E.ColiLpxL、LpxP和LpxM同源。通过在大肠杆菌中高效表达这三种酰基转移酶基因,分离脂类AS并利用ESI/MS sakazakii LpxL和LpxM分别将C14:0二级酰基转移到类脂A的2‘和3’位来分析它们的结构,从而证实了这三种酰基转移酶的功能。Skazakii LpxP可以将C16:1或C14:0二级酰链转移到脂类A的2‘-位。
Lipid A, the hydrophobic anchor of lipopolysaccharide, is an essential component in the outer membrane of most Gram-negative bacteria. Food-borne pathogen Cronobacter sakazakii synthesizes two lipid A species, differing by the length of the secondary acyl chain. In this work, we identified three genes ESA02293, ESA02951 and ESA01386 encoding for the late acyltransferases of lipid A biosynthesis pathway in C. sakazakii. Based on the sequence alignment, proteins YP_001438378.1 encoded by ESA02293, YP_001439016.1 encoded by ESA02951, and YP_001437482.1 encoded by ESA01386 are homologous to E. coli LpxL, LpxP and LpxM, respectively. Functions of the three acyltransferases were confirmed by overexpressing the genes in E. coli, isolating lipid As and analyzing their structures using an ESI/MS. C. sakazakii LpxL and LpxM transfer a C14:0 secondary acyl chain to the 2′- and 3′-position of lipid A, respectively. C. sakazakii LpxP can transfer either a C16:1 or a C14:0 secondary acyl chains to the 2′-position of lipid A.
坂崎克罗诺杆菌中脂质 A 的表征
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