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Journal of Bacteriology, December 2004, p. 8144-8148, Vol. 186, No. 23
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.23.8144-8148.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

The Malic Enzyme Is Required for Optimal Photoautotrophic Growth of Synechocystis sp. Strain PCC 6803 under Continuous Light but Not under a Diurnal Light Regimen

Terry M. Bricker,1* Shulu Zhang,2 Susan M. Laborde,1 Paul R. Mayer III,1 Laurie K. Frankel,1 and James V. Moroney1

Department of Biological Sciences, Molecular and Cell Biology Section, Louisiana State University, Baton Rouge, Louisiana,1 Plant Science Research Center, The University of Toledo, Toledo, Ohio2

Received 23 June 2004/ Accepted 20 August 2004

A mutation was recovered in the slr0721 gene, which encodes the decarboxylating NADP+-dependent malic enzyme in the cyanobacterium Synechocystis sp. strain PCC 6803, yielding the mutant 3WEZ. Under continuous light, 3WEZ exhibits poor photoautotrophic growth while growing photoheterotrophically on glucose at rates nearly indistinguishable from wild-type rates. Interestingly, under diurnal light conditions (12 h of light and 12 h of dark), normal photoautotrophic growth of the mutant is completely restored.

* Corresponding author. Mailing address: Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803. Phone: (225) 578-1555. Fax: (225) 578-7258. E-mail: btbric{at}lsu.edu.

Journal of Bacteriology, December 2004, p. 8144-8148, Vol. 186, No. 23
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.23.8144-8148.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.





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