A repressor-antirepressor pair links two loci controlling light-induced carotenogenesis in Myxococcus xanthus
JJ López-Rubio, M Elı́as-Arnanz… - Journal of Biological …, 2002 - ASBMB
The light-inducible carB operon encodes all but one of the structural genes for
carotenogenesis inMyxococcus xanthus. It is transcriptionally controlled by two proteins
expressed from two unlinked genetic loci: CarS from the light-inducible carQRS operon, and
CarA from the light-independent carA operon. CarA represses transcription from the carB
promoter (PB) in the dark, and CarS counteracts this on illumination. The CarA sequence
revealed a helix-turn-helix DNA-binding motif of the type found in bacterial MerR …
carotenogenesis inMyxococcus xanthus. It is transcriptionally controlled by two proteins
expressed from two unlinked genetic loci: CarS from the light-inducible carQRS operon, and
CarA from the light-independent carA operon. CarA represses transcription from the carB
promoter (PB) in the dark, and CarS counteracts this on illumination. The CarA sequence
revealed a helix-turn-helix DNA-binding motif of the type found in bacterial MerR …
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