FEATURES

FAMILY

DESCRIPTION

Also known as PSB27_SYNY3, psb27. Plays a role in the repair and/or biogenesis of the calcium-manganese-oxide cluster on the lumenal face of the thylakoid membrane. Photosystem II (PSII) complexes containing this protein are monomeric, are assembly intermediates lacking the calcium-manganese-oxide cluster and miss some of the lumenal subunits. Probably blocks binding of some of the small lumenal subunits. Monomer. Forms a complex with a monomeric, partially assembled PSII. This is probably the complex in which D1 is assembled and/or replaced. Present in 6-10% of PSII complexes; mostly in monomeric PSII. These PSII do not evolve oxygen, do not have an assembled calcium-manganese-oxide cluster. Psb27-containing PSII seem to be assembly intermediates; a wild-type strain includes the intrinsic membrane proteins, Psb27, Pbs28, substoichiometric amounts of PsbO and PsbQ but no PsbU or PsbV, while a ctpA deletion mutant includes the intrinsic membrane proteins (D1 as precursor), Psb27, a very low amount of PsbO and PsbQ, but no PsbU or PsbV. Small amounts of Psb27 interact with the lumenal domain of CP43 (psbC) in wild-type and a ctpA mutant. A small amount can also be detected in monomeric and trimeric photosystem I (PSI), possibly via association with PsaB.

EXTERNAL LINKS

psb27

Mutations

Mutation(s) distribution

Mutations table