1887

Abstract

Glycerophosphodiesters are formed by deacylation of phospholipids. and other soil-dwelling actinomycetes utilize glycerophosphodiesters as phosphate and carbon sources by the action of glycerophosphodiester phosphodiesterases (GDPDs). Seven genes encoding putative GDPDs occur in the genome. Two of these genes, and , encoding extracellular GDPDs, showed a PhoP-dependent upregulated profile in response to phosphate shiftdown. Expression studies using the genes as reporter confirmed the PhoP dependence of both and . Footprinting analyses with pure GST-PhoP of the promoter revealed four protected direct repeat units (DRu). PhoP binding affinity to the promoter was lower and revealed a protected region containing five DRu. As expected for regulon genes, inorganic phosphate, and also glycerol 3-phosphate, inhibited the expression from both and . The expression of was also repressed by serine and inositol but expression of was not. In contrast, glucose, fructose and glycerol increased expression of but not that of . In summary, our results suggest an interaction of phosphate control mediated by PhoP and carbon source regulation of the and genes involving complex operator structures.

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2009-06-01
2021-10-25
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