title: Psb28 is involved in recovery of photosystem II at high temperature in Synechocystis sp. PCC 6803.
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.
authors.affiliation: Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Meguro-ku, Tokyo 153-8902, Japan.
authors.forename: Shinya
authors.initials: S
authors.lastname: Sakata
authors.forename: Naoki
authors.initials: N
authors.lastname: Mizusawa
authors.forename: Hisako
authors.initials: H
authors.lastname: Kubota-Kawai
authors.forename: Isamu
authors.initials: I
authors.lastname: Sakurai
authors.forename: Hajime
authors.initials: H
authors.lastname: Wada
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism / Q000528:radiation effects*; D002734:Chlorophyll / Q000378:metabolism / Q000528:radiation effects; D038983:Galactolipids / Q000378:metabolism / Q000528:radiation effects; D015964:Gene Expression Regulation, Bacterial / Q000528:radiation effects; D005838:Genotype; D006358:Hot Temperature; D008027:Light; D009154:Mutation; D010641:Phenotype; D010788:Photosynthesis / Q000528:radiation effects*; D045332:Photosystem II Protein Complex / Q000235:genetics / Q000378:metabolism / Q000528:radiation effects*; D046939:Synechocystis / Q000235:genetics / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects*; D013997:Time Factors
chemical_list: D001426:Bacterial Proteins; D038983:Galactolipids; D045332:Photosystem II Protein Complex; C007388:digalactosyldiacylglycerol; C083100:photosystem II, chlorophyll binding protein, CP-43; D002734:Chlorophyll