HMM Summary Page: TIGR01152

Functionphotosystem II D2 protein (photosystem q(a) protein)
Gene SymbolpsbD
Trusted Cutoff600.60
Domain Trusted Cutoff600.60
Noise Cutoff388.50
Domain Noise Cutoff388.50
Isology Typeequivalog
HMM Length352
Mainrole CategoryEnergy metabolism
Subrole CategoryElectron transport
Gene Ontology TermGO:0009055: electron carrier activity molecular_function
GO:0009538: photosystem I reaction center cellular_component
GO:0009539: photosystem II reaction center cellular_component
AuthorUjwal ML, Paulsen IT
Entry DateFeb 4 2001 6:03PM
Last ModifiedFeb 14 2011 3:27PM
CommentThis model describes the Photosystem II, DII subunit (also called Q(A)) in bacterial and its equivalents in chloroplast of algae and higher plants. Photosystem II is in many ways functionally equivalent to bacterial reaction center. At the core of Photosystem II are several light harvesting cofactors including plastoquinones, pheophytins, phyloquinones etc. These cofactors are intimately associated with the polypeptides, which principally including subunits DI, DII, Cyt.b, Cyt.f and iron-sulphur protein. Together they participate in the electron transfer reactions that lead to the net production of the reducting equivalents in the form of NADPH, which are used for reduction of CO2 to carbohydrates(C6H1206). Phosystem II operates during oxygenic photosynthesis and principal electron donor is H2O. Although no high resolution X-ray structural data is presently available, recently a 3D structure of the supercomplex has been described by cryo-electron microscopy. Besides a huge body of literature exits that describes function using a variety of biochemical and biophysical techniques.
References DR HAMAP; MF_01383; 158 of 158
Genome PropertyGenProp0661: photosystem II (HMM)