HPr kinase/phosphatase of Bacillus subtilis: expression of the gene and effects of mutations on enzyme activity, growth and carbon catabolite repression.
HPr kinase/phosphatase (HPrK/P) is the key protein in regulation of carbon metabolism in Bacillus subtilis and many other Gram-positive bacteria. Whether this enzyme acts as a kinase or phosphatase is determined by the nutrient status of the cell. Mutational analysis of residues in a Walker A box nucleotide-binding motif revealed that it is not only important for kinase but is also involved in phosphatase activity. In addition, a signature sequence specifically conserved among HPrK/P orthologues is required for phosphatase activity and may be involved in interaction with HPr/HPr-(Ser46)-P. Carbon catabolite repression was abolished in a B. subtilis strain expressing a mutant form of HPrK/P deficient in kinase and phosphatase activities. The growth characteristics of this strain were similar to those of the wild-type. In contrast, B. subtilis strains expressing HPrK/P with partial kinase and no phosphatase activities showed growth impairment but exhibited catabolite repression.
Hanson
K G
KG
Birla Institute of Scientific Research, Statue Circle, Jaipur 302001, Rajasthan, India2.|Lehrstuhl für Mikrobiologie, Institut für Mikrobiologie, Biochemie und Genetik der Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstr. 5, D-91058 Erlangen, Germany1.
Steinhauer
Katrin
K
Lehrstuhl für Mikrobiologie, Institut für Mikrobiologie, Biochemie und Genetik der Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstr. 5, D-91058 Erlangen, Germany1.
Reizer
Jonathan
J
Hillen
Wolfgang
W
Lehrstuhl für Mikrobiologie, Institut für Mikrobiologie, Biochemie und Genetik der Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstr. 5, D-91058 Erlangen, Germany1.
Stülke
Jörg
J
Lehrstuhl für Mikrobiologie, Institut für Mikrobiologie, Biochemie und Genetik der Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstr. 5, D-91058 Erlangen, Germany1.
D000595:Amino Acid Sequence; D001412:Bacillus subtilis / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D001426:Bacterial Proteins; D050260:Carbohydrate Metabolism; D002241:Carbohydrates / Q000494:pharmacology; D002244:Carbon / Q000378:metabolism* / Q000494:pharmacology; D017124:Conserved Sequence; D015964:Gene Expression Regulation, Bacterial / Q000187:drug effects; D008969:Molecular Sequence Data; D016296:Mutagenesis / Q000235:genetics; D009154:Mutation / Q000235:genetics*; D010749:Phosphoprotein Phosphatases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D017346:Protein Serine-Threonine Kinases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*
D001426:Bacterial Proteins; D002241:Carbohydrates; D002244:Carbon; C110847:HPr kinase; D017346:Protein Serine-Threonine Kinases; D010749:Phosphoprotein Phosphatases