Abstract
A rapid procedure has been developed for the isolation of the photosystem two reaction centre complex (PS II RC) from a double mutant of Chlamydomonas reinhardtii, F54-14, which lacks the Photosystem one complex and the chloroplast ATPase. Thylakoid membranes are solubilised with 1.5% (w/v) Triton X-100 and the PS II RC purified by anion-exchange chromatography using TSK DEAE-650(S) (Merck). The complex has a pigment stoichiometry of approximately six chlorophyll a: two pheophytin a: one cytochrome b-559: one to two β-carotene. It photoaccumulates reduced pheophytin and oxidised P680 in the presence of sodium dithionite and silicomolybdate, respectively. Immunoblotting experiments have confirmed the presence of the D1 and D2 polypeptides in this complex. The α-subunit of cytochrome b-559 was identified by N-terminal sequencing. Comparison of the complex with the PS II RC from pea using SDS-polyacrylamide gel electrophoresis showed that their polypeptide compositions were similar. However, the α-subunit of cytochrome b-559 from C. reinhardtii has a lower apparent molecular weight than the pea counterpart whereas the β-subunit is larger.
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Abbreviations
- DM:
-
n-dodecyl β-d-maltoside
- RC:
-
reaction centre
- SiMo:
-
silicomolybdate, SiMo12O40 4−
- TAP:
-
Tris-acetate-phosphate
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Alizadeh, S., Nixon, P.J., Telfer, A. et al. Isolation and characterisation of the Photosystem two reaction centre complex from a double mutant of Chlamydomonas reinhardtii . Photosynth Res 43, 165–171 (1995). https://doi.org/10.1007/BF00042974
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DOI: https://doi.org/10.1007/BF00042974