Functioning of DcuC as the C4-dicarboxylate carrier during glucose fermentation by Escherichia coli

被引：50

作者：

Zientz, E ^{[1
]}

Janausch, IG ^{[1
]}

Six, S ^{[1
]}

Unden, G ^{[1
]}

机构：

[1] Univ Mainz, Inst Mikrobiol & Weinforsch, D-55099 Mainz, Germany

来源：

JOURNAL OF BACTERIOLOGY | 1999年 / 181卷 / 12期

关键词：

D O I：

10.1128/JB.181.12.3716-3720.1999

中图分类号：

Q93 [微生物学];

学科分类号：

071005 ; 100705 ;

摘要：

The dcuC gene of Escherichia coli encodes an alternative C-4-dicarboxylate carrier (DcuC) with low transport activity. The expression of dcuC was investigated. dcuC was expressed only under anaerobic conditions; nitrate and fumarate caused slight repression and stimulation of expression, respectively. Anaerobic induction depended mainly on the transcriptional regulator FNR. Fumarate stimulation was independent of the fumarate response regulator DcuR. The expression of dcuC was not significantly inhibited by glucose, assigning a role to DcuC during glucose fermentation. The inactivation of dcuC increased fumarate-succinate exchange and fumarate uptake by DcuA and DcuB, suggesting a preferential function of DcuC in succinate efflux during glucose fermentation. Upon overexpression in a dcuC promoter mutant (dcuC*), DcuC was able to compensate for DcuA and DcuB in fumarate-succinate exchange and fumarate uptake.

引用

页码：3716 / 3720

页数：5

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