title: PII T-loop mutations affecting signal transduction to NtrB also abolish yeast two-hybrid interactions.
abstract: Mutations A49P and Delta47-53 at the T loop of the Escherichia coli GlnB (PII) protein impair regulatory interactions with the two-component sensor regulator NtrB (P. Jiang, P. Zucker, M. R. Atkinson, E. S. Kamberov, W. Tirasophon, P. Chandran, B. R. Schepke, and A. J. Ninfa, J. Bacteriol. 179: 4342-4353, 1997). We show here that these mutations also impair interactions between PII and NtrB in the yeast two-hybrid system, indicating that defects in NtrB regulation closely reflect binding impairment. The reported results underline the strength of two-hybrid assays for analysis of interactions involving the T loop of PII proteins.
authors.affiliation: División de Genética, Universidad de Alicante, E-03080 Alicante, Spain.
authors.forename: Isabel
authors.initials: I
authors.lastname: Martínez-Argudo
authors.forename: Asunción
authors.initials: A
authors.lastname: Contreras
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism*; D001665:Binding Sites; D009154:Mutation; D051922:PII Nitrogen Regulatory Proteins; D010749:Phosphoprotein Phosphatases / Q000235:genetics / Q000378:metabolism*; D011494:Protein Kinases / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction; D020798:Two-Hybrid System Techniques
chemical_list: D001426:Bacterial Proteins; D051922:PII Nitrogen Regulatory Proteins; D011993:Recombinant Fusion Proteins; C404143:PIID regulatory protein, Bacteria; D011494:Protein Kinases; C055699:protein kinase-phosphatase NTRB; D010749:Phosphoprotein Phosphatases