HMM Summary Page: TIGR01151

Functionphotosystem II q(b) protein
Gene SymbolpsbA
Trusted Cutoff596.05
Domain Trusted Cutoff596.05
Noise Cutoff223.20
Domain Noise Cutoff223.20
Isology Typeequivalog
EC Number1.10.3.9
HMM Length360
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 6:01PM
Last ModifiedDec 12 2011 10:07PM
CommentThis model describes the Photosystem II, DI subunit (also called Q(B)) in bacterial and its equivalents in chloroplast of algae and higher plants. Photosystem II is 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 structural data is presently available, a huge body of literature exits that describes function using a variety of biochemical and biophysical techniques.
ReferencesRM 10903370 RT Phylogeny of Ultra-Rapidly Evolving Dinoflagellate Chloroplast Genes: A Possible Common Origin for Sporozoan and Dinoflagellal Plastids RA Zhang,Z., Green,B.R. and Cavalier-Smith,T RL J. Mol. Evol. 51 (1), 26-40 (2000) DR HAMAP; MF_01379; 216 of 227
Genome PropertyGenProp0661: photosystem II (HMM)