Expression of two nblA-homologous genes is required for phycobilisome degradation in nitrogen-starved Synechocystis sp. PCC6803 |
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| Authors: | Baier K Nicklisch S Grundner C Reinecke J Lockau W |
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| Affiliation: | 1. Beijing Advanced Innovation Center for Genomics, Biodynamic Optical Imaging Center, School of Life Sciences and Peking-Tsinghua Center for Life Sciences, College of Engineering, Peking University, Beijing, China;2. School of Life Sciences and Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing, China;1. Department of Applied Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo, Japan;2. Research Center for Advanced Science and Technology, The University of Tokyo, Meguro-ku, Tokyo, Japan;1. Department of Chemical Engineering, Pennsylvania State University, University Park, PA, USA;2. Department of Biology, Washington University in St. Louis, St. Louis, MO 63130, USA |
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| Abstract: | One of the responses exhibited by cyanobacteria when they are limited for an essential nutrient is the rapid degradation of their light-harvesting complex, the phycobilisome. Phycobilisome degradation is an ordered proteolytic process, visible by a color change of the cyanobacterial cell from blue-green to yellow-green (chlorosis). The small polypeptide NblA plays a key role in degradation of phycobilisomes in Synechococcus sp. PCC7942. Unlike Synechococcus, Synechocystis sp. PCC6803 has two nblA-homologous genes, nblA1 and nblA2, which are contiguous on the genome. Here we show that nblA1 and nblA2 are simultaneously expressed in Synechocystis 6803 upon nitrogen deprivation, and are both required for phycobilisome degradation. |
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| Keywords: | Cyanobacterium Phycobilisome degradation Nitrogen starvation NblA Synechocystis sp. PCC6803 |
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