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在辛烷上生长会改变食油假单胞菌的膜脂脂肪酸，这是由于alkB的诱导和辛醇的合成所致。

Growth on octane alters the membrane lipid fatty acids of Pseudomonas oleovorans due to the induction of alkB and synthesis of octanol.

作者信息

Chen Q, Janssen D B, Witholt B

机构信息

Department of Biochemistry, University of Groningen, The Netherlands.

出版信息

J Bacteriol. 1995 Dec;177(23):6894-901. doi: 10.1128/jb.177.23.6894-6901.1995.

DOI:10.1128/jb.177.23.6894-6901.1995
PMID:7592483
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC177558/
Abstract

Growth of Pseudomonas oleovorans GPo1, which contains the OCT plasmid, on octane results in changes in the membrane phospholipid fatty acid composition. These changes were not found for GPo12, an OCT-plasmid-cured variant of GPo1, during growth in the presence or absence of octane, implying the involvement of OCT-plasmid-encoded functions. When recombinant strain GPo12(pGEc47) carrying the alk genes from the OCT plasmid was grown on octane, the cells showed the same changes in fatty acid composition as those found for GPo1, indicating that such changes result from induction and expression of the alk genes. This finding was corroborated by inducing GPo12(pGEc47) with dicyclopropylketone (DCPK), a gratuitous inducer of the alk genes. Further experiments showed that the increase of the mean acyl chain length of fatty acids is related to the expression of alkB, which encodes a major integral membrane protein, while the formation of trans unsaturated fatty acids mainly results from the effects of 1-octanol, an octane oxidation product.

摘要

含有OCT质粒的食油假单胞菌GPo1在辛烷上生长会导致膜磷脂脂肪酸组成发生变化。在有无辛烷存在的情况下，GPo12（GPo1的OCT质粒消除变体）生长时均未发现这些变化，这意味着OCT质粒编码的功能参与其中。当携带来自OCT质粒的alk基因的重组菌株GPo12(pGEc47)在辛烷上生长时，细胞脂肪酸组成的变化与GPo1相同，表明这种变化是由alk基因的诱导和表达引起的。用双环丙基酮（DCPK，alk基因的 gratuitous诱导剂）诱导GPo12(pGEc47)证实了这一发现。进一步的实验表明，脂肪酸平均酰基链长度的增加与编码主要整合膜蛋白的alkB的表达有关，而反式不饱和脂肪酸的形成主要是由辛烷氧化产物1-辛醇的作用导致的。