荚膜红假单胞菌中几个参与细菌叶绿素生物合成的基因对氧气响应的转录调控
Transcriptional regulation of several genes for bacteriochlorophyll biosynthesis in Rhodopseudomonas capsulata in response to oxygen.
作者信息
Biel A J, Marrs B L
出版信息
J Bacteriol. 1983 Nov;156(2):686-94. doi: 10.1128/jb.156.2.686-694.1983.
Abstract
Although it has been shown that bacteriochlorophyll synthesis in Rhodopseudomonas capsulata is repressed by oxygen and high light intensity, few details of regulation by these environmental factors are known, primarily owing to a lack of assays for the biosynthetic enzymes. We have examined regulation at the transcriptional level by isolating and studying fusions between the Mu d1(Apr lac) phage and various bch genes. In these strains, the lacZ gene of the phage is under the control of bch gene promoters. We have found that atmospheric oxygen tension (20% O2) reduces the expression of these fusions at least twofold compared with low oxygen tension (2% O2). Therefore, transcription of the bchA, bchB, bchC, bchG, and bchH genes is regulated in response to oxygen.
摘要
尽管已经表明荚膜红假单胞菌中的细菌叶绿素合成受到氧气和高光强度的抑制，但由于缺乏对生物合成酶的检测方法，关于这些环境因素调控的细节知之甚少。我们通过分离和研究Mu d1(Apr lac)噬菌体与各种bch基因之间的融合体，在转录水平上研究了调控情况。在这些菌株中，噬菌体的lacZ基因受bch基因启动子的控制。我们发现，与低氧张力（2% O2）相比，大气氧张力（20% O2）使这些融合体的表达至少降低了两倍。因此，bchA、bchB、bchC、bchG和bchH基因的转录受氧气的调控。
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