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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Sakurai, Isamu Kubota-kawai, Hisako Sakata, Shinya Wada, Hajime Mizusawa, Naoki |
| Description | Author Affiliation: Sakata S ( Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Meguro-ku, Tokyo 153-8902, Japan.) |
| Abstract | Psb28 is an extrinsic protein of photosystem II (PSII), which is conserved among photosynthetic organisms from cyanobacteria to higher plants. A unicellular cyanobacterium, Synechocystis sp. PCC 6803, has two homologs of Psb28, Psb28-1 and Psb28-2. However, the role of these proteins remains poorly understood. In this study, we disrupted the psb28-1 ( sll1398 ) and psb28-2 ( slr1739 ) genes in wild-type Synechocystis sp. PCC 6803 and examined their photosynthetic properties to elucidate the physiological role of Psb28 in photosynthesis. We also disrupted the psb28-1 gene in a dgdA mutant defective in the biosynthesis of digalactosyldiacylglycerol, in which Psb28-1 significantly accumulates in PSII. The disruption of the psb28-1 gene in the wild-type resulted in growth retardation under high-light conditions at high temperatures with a low rate of restoration of photodamaged photosynthetic machinery. Similar phenomena were observed at normal growth temperatures in the psb28-1/dgdA double mutant. In contrast, disruption of psb28-2 in the wild-type and dgdA mutant did not affect host strain phenotype, suggesting that Psb28-2 does not contribute to the recovery of PSII. In addition, protein analysis using strains expressing His-tagged Psb28-1 revealed that Psb28-1 is mainly associated with the CP43-less PSII monomer. In the dgdA mutant, the CP43-less PSII monomer accumulated to a greater extent than in the wild-type, and its accumulation caused greater accumulation of Psb28-1 in PSII. These results demonstrate that Psb28-1 plays an important role in PSII repair through association with the CP43-less monomer, particularly at high temperatures. |
| ISSN | 00063002 |
| Journal | Biochimica et Biophysica Acta (BBA) - Reviews on Cancer |
| Issue Number | 1 |
| Volume Number | 1827 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2013-01-01 |
| Publisher Place | Netherlands |
| Access Restriction | Open |
| Subject Keyword | Bacterial Proteins Radiation Effects Hot Temperature Photosynthesis Photosystem II Protein Complex Synechocystis Genetics Metabolism Chlorophyll Galactolipids Gene Expression Regulation, Bacterial Genotype Mutation Phenotype Growth & Development Time Factors Research Support, Non-U.S. Gov't Biochemistry |
| Content Type | Text |
| Resource Type | Article |
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