供应anti-PsbO (33 kDa protein of

PsbO is an extrinsic subunit of photosystem II and has been proposed to play a central role in stabilisation of the catalytic manganese cluster. Arabidopsis genome encodes two psbO genes: psbO1 and psbO2. PsbO1 protein is the major isoform in the wild-type. A mutant plant that lack PsbO1 shows considerable growth retardation despite the presence of PsbO2 (Murakami et al., 2002, FEBS Lett. 523, 138 –142; Murakami et al., 2005, FEBS Lett. 272, 2165 – 2175). The accumulation of PsbOs limited the levels of other photosystem II proteins as well as the efficiency of photosystem II.PsbO-deletion mutant in Chlamydomonas had an enhanced turnover of PsbA, a major protein of the photosystem II reaction centre (Mayfield et al., 1987, EMBO J. 6, 313 – 318). In cyanobacteria, a psbO-deletion mutant accumulated photosystem II reaction centres at nearly normal levels. The differences in the behaviour of the deletion mutants between higher plants, green algae and cyanobacteria suggest a difference in the relationship between the extrinsic proteins.