Homologous Superfamily

Photosystem II PsbZ superfamily (IPR036512)

Short name: PSII_PsbZ_sf

Overlapping entries


PSII is a multisubunit protein-pigment complex containing polypeptides both intrinsic and extrinsic to the photosynthetic membrane [PMID: 12518057, PMID: 15100025]. Within the core of the complex, the chlorophyll and beta-carotene pigments are mainly bound to the antenna proteins CP43 (PsbC) and CP47 (PsbB), which pass the excitation energy on to the reaction centre proteins D1 (Qb, PsbA) and D2 (Qa, PsbD) that bind all the redox-active cofactors involved in the energy conversion process. The PSII oxygen-evolving complex (OEC) oxidises water to provide protons for use by PSI, and consists of OEE1 (PsbO), OEE2 (PsbP) and OEE3 (PsbQ). The remaining subunits in PSII are of low molecular weight (less than 10 kDa), and are involved in PSII assembly, stabilisation, dimerisation, and photo-protection [PMID: 14871485].

This superfamily represents PsbZ (Ycf9), which is a core low molecular weight transmembrane protein of photosystem II in thylakoid-containing chloroplasts of cyanobacteria and plants. It is thought to be located at the interface of PSII and LHCII (light-harvesting complex II) complexes, the latter containing the light-harvesting antenna. PsbZ appears to act as a structural factor, or linker, that stabilises the PSII-LHCII supercomplexes, which fail to form in PsbZ-deficient mutants. This may in part be due to the marked decrease in two LHCII antenna proteins, CP26 and CP29, found in PsbZ-deficient mutants, which result in structural changes, as well as functional modifications in PSII [PMID: 11402165]. PsbZ may also be involved in photo-protective processes under sub-optimal growth conditions. Structurally, PsbZ has two antiparallel transmembrane helices.

GO terms

Biological Process

GO:0015979 photosynthesis
GO:0042549 photosystem II stabilization

Molecular Function

No terms assigned in this category.

Cellular Component

GO:0009523 photosystem II
GO:0009539 photosystem II reaction center

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.