A new sigma factor homolog in a cyanobacterium: cloning, sequencing, and light-responsive transcripts of rpoD2 from Microcystis aeruginosa K-81

摘要

We isolated an rpoD2 gene encoding the potential sigma factor of RNA polymerase from the cyanobacterium Microcystis aeruginosa K-81, which can perform photosynthesis. The deduced amino acid sequence of RpoD2 (σA2) exhibits extensive homology to other eubacterial RpoD proteins. This gene possessed multiple 5′-end transcripts, expressed specifically under light (PL), dark (PD), or constitutively light/dark (PC) conditions during exponential cell growth. ? 1997 Elsevier Science B.V. All rights reserved.