Journal
JOURNAL OF BIOTECHNOLOGY
Volume 154, Issue 2-3, Pages 149-155Publisher
ELSEVIER
DOI: 10.1016/j.jbiotec.2010.07.015
Keywords
Corynebacterium glutamicum; Phosphate starvation; pstSCAB; Transcriptional regulation; GlxR
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Funding
- German Ministry of Education and Research (BMBF) [0313805I, 031U113D, 031U213D]
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The pstSCAB operon of Corynebacterium glutamicum, which encodes a high affinity transport system for uptake of the phosphorus source inorganic phosphate, is induced upon phosphate starvation involving activation by the two-component regulatory system PhoS-PhoR. Partial phosphate starvation induction of the pstSCAB operon in a Delta phoRS mutant indicated the involvement of (an) additional transcriptional regulator(s). Here, GlxR, a global cAMP-dependent transcriptional regulator, was shown to bind to the pstS promoter -133 bp to -117 bp upstream of the transcriptional start site as shown by gel shift and mutation experiments. Transcriptional fusion analysis revealed that GlxR activates the pstSCAB operon under phosphate limiting conditions in a carbon source dependent manner. Commensurate with these findings, overexpression of glxR was shown to stimulate growth under phosphate limiting conditions with glucose, but not with acetate, as carbon source. Thus, in C. glutamicum pstSCAB expression is regulated in response to the availability of phosphorus and carbon sources. (C) 2010 Elsevier B. V. All rights reserved.
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