The heme-binding protein HbpS regulates the activity of the Streptomyces reticuli iron-sensing histidine kinase SenS in a redox-dependent manner

Autor(en): Bogel, Gabriele
Schrempf, Hildgund 
Lucana, Dario Ortiz de Orue
Stichwörter: 2-COMPONENT SYSTEM; Biochemistry & Molecular Biology; CATALASE-PEROXIDASE CPEB; COELICOLOR; ESCHERICHIA-COLI; EXPRESSION; Heme-binding protein HbpS; IDENTIFICATION; OXIDATIVE STRESS; PHOSPHORYLATION; Redox stress; RESPONDS; SIGNAL-TRANSDUCTION SYSTEM; Streptomyces; Two-component system SenS/SenR
Erscheinungsdatum: 2009
Herausgeber: SPRINGER WIEN
Journal: AMINO ACIDS
Volumen: 37
Ausgabe: 4
Startseite: 681
Seitenende: 691
Zusammenfassung: 
The SenS/SenR system of Streptomyces reticuli regulates the expression of the redox regulator FurS, the catalase-peroxidase CpeB and the heme-binding protein HbpS. SenS/SenR is also proposed to participate in sensing redox changes, mediated by HbpS. Here, we show in vitro that heme-free HbpS represses the autokinase activity of SenS; whereas hemin-treated HbpS considerably enhances SenS autophosphorylation under redox conditions using either H2O2 or DTT. The presence of iron ions alone or in combination with H2O2 or DTT also leads to significantly increased phosphorylation levels of SenS. Further comparative physiological studies using the S. reticuli WT, a S. reticuli hbpS mutant and a S. reticuli senS-senR mutant corroborates the importance of HbpS and the SenS/SenR system for resistance against high concentrations of iron ions and hemin in vivo. Hence SenS/SenR and HbpS act in concert as a novel three-component system which detects redox stress, mediated by iron ions and heme.
ISSN: 09394451
DOI: 10.1007/s00726-008-0188-5

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