The transcription regulator RbsR represents a novel interaction partner of the phosphoprotein HPr-Ser46-P in Bacillus subtilis

The FEBS Journal
Wolfgang MüllerHeinrich Sticht

Abstract

Histidine-containing protein (HPr) is a central metabolic sensor in low-GC Gram-positive bacteria and plays a dual role in sugar uptake by the phosphoenolpyruvate-sugar phosphotransferase system and in transcriptional control during carbon catabolite repression. The latter process is mediated by interaction between HPr and the carbon catabolite repression master transcription regulator, carbon catabolite protein A (CcpA), a member of the LacI-GalR family of DNA-binding proteins. We investigated, with a combination of computational and experimental tools, whether HPr can also interact with other transcriptional regulators. To allow rapid identification of paralogous LacI-GalR family members that might interact with HPr in a similar fashion to CcpA, a structure-based computational approach was developed which relies on the analysis of the similarity of protein-protein interfaces between different complexes. A key element of this method is an empirical pair potential derived from a group of orthologous complexes and subsequently used to identify paralogs that exhibit similar properties of their protein interfaces. Application of this method to the family of LacI-GalR repressors in Bacillus subtilis predicted the ribose operon repr...Continue Reading

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Apr 4, 2021·International Journal of Molecular Sciences·José L NeiraMaría Grazia Ortore

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