S-Space College of Natural Sciences (자연과학대학) Biophysics and Chemical Biology (생물물리 및 화학생물학과) Journal Papers (저널논문_생물물리 및 화학생물학과)
HPr antagonizes the anti-sigma(70) activity of Rsd in Escherichia coli
- Park, Young-Ha; Lee, Chang-Ro; Choe, Mangyu; Seok, Yeong-Jae
- Issue Date
- National Academy of Sciences
- Proceeding of the National Academy of Sciences of the United States of America Vol.110 No.52, pp. 21142-21147
- The bacterial phosphoenolpyruvate: sugar phosphotransferase system (PTS) is a multicomponent system that participates in a variety of physiological processes in addition to the phosphorylation-coupled transport of numerous sugars. In Escherichia coli and other enteric bacteria, enzyme IIA(Glc) (EIIA(Glc)) is known as the central processing unit of carbon metabolism and plays multiple roles, including regulation of adenylyl cyclase, the fermentation/respiration switch protein FrsA, glycerol kinase, and several non-PTS transporters, whereas the only known regulatory role of the E. coli histidine-containing phosphocarrier protein HPr is in the activation of glycogen phosphorylase. Because HPr is known to be more abundant than EIIA(Glc) in enteric bacteria, we assumed that there might be more regulatory mechanisms connected with HPr. The ligand fishing experiment in this study identified Rsd, an anti-sigma factor known to complex with sigma(70) in stationary-phase cells, as an HPr-binding protein in E. coli. Only the dephosphorylated form of HPr formed a tight complex with Rsd and thereby inhibited complex formation between Rsd and sigma(70). Dephosphorylated HPr, but not phosphorylated HPr, antagonized the inhibitory effect of Rsd on sigma(70)-dependent transcriptions both in vivo and in vitro, and also influenced the competition between sigma(70) and sigma(S) for core RNA polymerase in the presence of Rsd. Based on these data, we propose that the anti-sigma(70) activity of Rsd is regulated by the phosphorylation state-dependent interaction of HPr with Rsd.
- 0027-8424 (print)