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Journal of Bacteriology, January 2008, p. 286-299, Vol. 190, No. 1
0021-9193/08/$08.00+0     doi:10.1128/JB.01375-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Transcriptome Dynamics during the Transition from Anaerobic Photosynthesis to Aerobic Respiration in Rhodobacter sphaeroides 2.4.1{triangledown} ,{dagger}

Hiroyuki Arai,1,2 Jung Hyeob Roh,1 and Samuel Kaplan1*

Department of Microbiology and Molecular Genetics, Health Science Center, University of Texas, Houston, Texas,1 Department of Biotechnology, University of Tokyo, Tokyo, Japan2

Received 24 August 2007/ Accepted 11 October 2007

Rhodobacter sphaeroides 2.4.1 is a facultative photosynthetic anaerobe that grows by anoxygenic photosynthesis under anaerobic-light conditions. Changes in energy generation pathways under photosynthetic and aerobic respiratory conditions are primarily controlled by oxygen tensions. In this study, we performed time series microarray analyses to investigate transcriptome dynamics during the transition from anaerobic photosynthesis to aerobic respiration. Major changes in gene expression profiles occurred in the initial 15 min after the shift from anaerobic-light to aerobic-dark conditions, with changes continuing to occur up to 4 hours postshift. Those genes whose expression levels changed significantly during the time series were grouped into three major classes by clustering analysis. Class I contained genes, such as that for the aa3 cytochrome oxidase, whose expression levels increased after the shift. Class II contained genes, such as those for the photosynthetic apparatus and Calvin cycle enzymes, whose expression levels decreased after the shift. Class III contained genes whose expression levels temporarily increased during the time series. Many genes for metabolism and transport of carbohydrates or lipids were significantly induced early during the transition, suggesting that those endogenous compounds were initially utilized as carbon sources. Oxidation of those compounds might also be required for maintenance of redox homeostasis after exposure to oxygen. Genes for the repair of protein and sulfur groups and uptake of ferric iron were temporarily upregulated soon after the shift, suggesting they were involved in a response to oxidative stress. The flagellar-biosynthesis genes were expressed in a hierarchical manner at 15 to 60 min after the shift. Numerous transporters were induced at various time points, suggesting that the cellular composition went through significant changes during the transition from anaerobic photosynthesis to aerobic respiration. Analyses of these data make it clear that numerous regulatory activities come into play during the transition from one homeostatic state to another.

* Corresponding author. Mailing address: Department of Microbiology and Molecular Genetics, University of Texas, Health Science Center at Houston, Houston, TX 77030. Phone: (713) 500-5502. Fax: (713) 500-5499. E-mail: samuel.kaplan{at}uth.tmc.edu

{triangledown} Published ahead of print on 26 October 2007.

{dagger} Supplemental material for this article may be found at http://jb.asm.org/.

Journal of Bacteriology, January 2008, p. 286-299, Vol. 190, No. 1
0021-9193/08/$08.00+0     doi:10.1128/JB.01375-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.



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