Effect of cra gene knockout together with edd and iclR genes knockout on the metabolism in Escherichia coli.

Abstract:

:To elucidate the physiological adaptation of Escherichia coli due to cra gene knockout, a total of 3,911 gene expressions were investigated by DNA microarray for continuous culture. About 50 genes were differentially regulated for the cra mutant. TCA cycle and glyoxylate shunt were down-regulated, while pentose phosphate (PP) pathway and Entner Doudoroff (ED) pathway were up-regulated in the cra mutant. The glucose uptake rate and the acetate production rate were increased with less acetate consumption for the cra mutant. To identify the genes controlled by Cra protein, the Cra recognition weight matrix from foot-printing data was developed and used to scan the whole genome. Several new Cra-binding sites were found, and some of the result was consistent with the DNA microarray data. The ED pathway was active in the cra mutant; we constructed cra.edd double genes knockout mutant to block this pathway, where the acetate overflowed due to the down-regulation of aceA,B and icd gene expressions. Then we further constructed cra.edd.iclR triple genes knockout mutant to direct the carbon flow through the glyoxylate pathway. The cra.edd.iclR mutant showed the least acetate production, resulting in the highest cell yield together with the activation of the glycolysis pathway, but the glucose consumption rate could not be improved.

journal_name

Arch Microbiol

journal_title

Archives of microbiology

authors

Sarkar D,Siddiquee KA,Araúzo-Bravo MJ,Oba T,Shimizu K

doi

10.1007/s00203-008-0406-2

subject

Has Abstract

pub_date

2008-11-01 00:00:00

pages

559-71

issue

5

eissn

0302-8933

issn

1432-072X

journal_volume

190

pub_type

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