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Keywords:

  • Cyanophycin;
  • Cyanophycin synthetase;
  • Dinitrogen fixation;
  • Anabaena variabilis ATCC 29413

Abstract

The gene cphA encoding cyanophycin synthetase was interrupted in Anabaena variabilis ATCC 29413 by insertional mutagenesis. The mutant lacked cyanophycin granules and the polar nodules of heterocysts. The mutant grew as fast as the wild-type irrespective of the nitrogen source at low light intensity whereas growth on N2 was somewhat reduced in high light. It is concluded that cyanophycin metabolism and polar nodules are not essential for aerobic N2 fixation.