HpkA, a Histidine Protein Kinase Homolog, is Required for Fruiting Body Development in Myxococcus xanthus

  • Park, Sooyeon (Section of Life Science, Hoseo University) ;
  • Kim, Jihoon (Section of Life Science, Hoseo University) ;
  • Lee, Bongsoo (Section of Life Science, Hoseo University) ;
  • Zusman, David R (Section of Life Science, Hoseo University) ;
  • Cho, Kyungyun (Section of Life Science, Hoseo University)
  • Published : 2003.06.01

Abstract

A gene (hpkA), encoding a histidine protein kinase homolog, has been identified in the upstream region of the espAB operon in Myxococcus xanthus. It encodes a 333 amino acid (35,952 Da) protein with a histidine protein kinase domain in the region from amino acid 90 to 317. Null mutations in the hpkA gene caused formation of loose irregular fruiting bodies, while wild-type strains developed tight hemispherical fruiting bodies under developmental conditions. Sporulation of the hpkA mutant was delayed by at least 12 h compared to that of the wild-type. It appeared that the hpkA mutation increased the expression of the espAB operon by more than 2-fold compared with the wild-type under developmental conditions. Expression of the hpkA gene was low under vegetative conditions, but was highly induced under developmental conditions.

Keywords

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