PsbY is required for prevention of photodamage to photosystem II in a PsbM-lacking mutant of Synechocystis sp. PCC 6803
| Autor: | J. J. Eaton-Rye, S. Biswas |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Photoinhibition Photosystem II Physiology Mutant Plastoquinone Cytochrome b559 macromolecular substances Plant Science 01 natural sciences Complementation 03 medical and health sciences chemistry.chemical_compound 030104 developmental biology Biochemistry chemistry Protein biosynthesis Bicarbonate binding 010606 plant biology & botany |
| Zdroj: | Photosynthetica. 56:200-209 |
| ISSN: | 1573-9058 0300-3604 |
| DOI: | 10.1007/s11099-018-0788-6 |
| Popis: | The PsbM (3.9 kDa) and PsbY (4.2 kDa) proteins are membrane-spanning, single-helix, subunits associated with the chlorophyll-binding CP47 pre-complex of photosystem II (PSII). Removal of PsbM resulted in accumulation of PSII pre-assembly complexes and impaired electron transfer between the primary (QA) and secondary (QB) plastoquinone electron acceptors of PSII indicating that the QB-binding site and bicarbonate binding to the non-heme iron were altered in this strain. Removal of PsbY alone had only a minor impact on PSII activity but deleting PsbY in the ΔPsbM background led to additional modification of the acceptor side resulting in ΔPsbM:ΔPsbY cells being susceptible to photodamage and this required protein synthesis for recovery. Addition of bicarbonate was able to compensate for the light-induced damage in ΔPsbM:ΔPsbY cells potentially re-occupying the modified bicarbonate-binding site in the ΔPsbM:ΔPsbY strain and complementation of ΔPsbM:ΔPsbY cells with the psbY gene restored the ΔPsbM phenotype. |
| Databáze: | OpenAIRE |
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