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Journal of Bacteriology, June 1999, p. 3516-3524, Vol. 181, No. 11
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

cpmA, a Gene Involved in an Output Pathway of the Cyanobacterial Circadian System

Mitsunori Katayama,1 Nicholas F. Tsinoremas,1,dagger Takao Kondo,2 and Susan S. Golden1,*

Department of Biology, Texas A&M University, College Station, Texas 77843-3258,1 and Department of Biology, Nagoya University, Chikusa, Nagoya 464-01, Japan2

Received 6 January 1999/Accepted 31 March 1999

We generated random mutations in Synechococcus sp. strain PCC 7942 to look for genes of output pathways in the cyanobacterial circadian system. A derivative of transposon Tn5 was introduced into the chromosomes of reporter strains in which cyanobacterial promoters drive the Vibrio harveyi luxAB genes and produce an oscillation of bioluminescence as a function of circadian gene expression. Among low-amplitude mutants, one mutant, tnp6, had an insertion in a 780-bp open reading frame. The tnp6 mutation produced an altered circadian phasing phenotype in the expression rhythms of psbAI::luxAB, psbAII::luxAB, and kaiA::luxAB but had no or little effect on those of psbAIII::luxAB, purF::luxAB, kaiB::luxAB, rpoD2::luxAB, ndhD::luxAB, and conII::luxAB. This suggests that the interrupted gene in tnp6, named cpmA (circadian phase modifier), is part of a circadian output pathway that regulates the expression rhythms of psbAI, psbAII, and kaiA.

* Corresponding author. Mailing address: Dept. of Biology, Texas A&M University, College Station, TX 77843-3258. Phone: (409) 845-9824. Fax: (409) 862-7659. E-mail: sgolden{at}tamu.edu.

dagger Present address: Incyte Pharmaceuticals, Department of Informatics, Palo Alto, CA 94304.

Journal of Bacteriology, June 1999, p. 3516-3524, Vol. 181, No. 11
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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