Function of lanI in regulation of landomycin A biosynthesis in Streptomyces cyanogenus S136 and cross-complementation studies with Streptomyces antibiotic regulatory proteins encoding genes.

The transcriptional regulator of landomycin A biosynthesis encoded by lanI gene has been inactivated within the chromosome of Streptomyces cyanogenus S136. The obtained mutant strain did not produce landomycin A and its known intermediates. Loss of landomycin A production caused significant changes in morphology of the lanI deficient strain.