Protein Family Models

This family represents the C terminal kinase domain of Hpr Serine/threonine kinase PtsK. This kinase is the sensor in a multicomponent phosphorelay system in control of carbon catabolic repression in bacteria [1]. This kinase in unusual in that it recognises the tertiary structure of its target and is a member of a novel family unrelated to any previously described protein phosphorylating enzymes [1]. X-ray analysis of the full-length crystalline enzyme from Staphylococcus xylosus at a resolution of 1.95 A shows the enzyme to consist of two clearly separated domains that are assembled in a hexameric structure resembling a three-bladed propeller [2]. [1]. 9570401. A novel protein kinase that controls carbon catabolite repression in bacteria. Reizer J, Hoischen C, Titgemeyer F, Rivolta C, Rabus R, Stulke J, Karamata D, Saier MH Jr, Hillen W;. Mol Microbiol 1998;27:1157-1169. [2]. 11904409. Structure of the full-length HPr kinase/phosphatase from Staphylococcus xylosus at 1.95 A resolution: Mimicking the product/substrate of the phospho transfer reactions. Marquez JA, Hasenbein S, Koch B, Fieulaine S, Nessler S, Russell RB, Hengstenberg W, Scheffzek K;. Proc Natl Acad Sci U S A 2002;99:3458-3463. (from Pfam)

Date:

2024-10-16

HPr kinase/phosphorylase catalyzes the ATP- as well as the pyrophosphate-dependent phosphorylation of 'Ser-46' in HPr, a phosphocarrier protein of the phosphoenolpyruvate-dependent sugar phosphotransferase system (PTS); also catalyzes the pyrophosphate-producing, inorganic phosphate-dependent dephosphorylation (phosphorolysis) of seryl-phosphorylated HPr (P-Ser-HPr)

Date:

2018-05-04