cd00226: PRC_PRCH (This model is not part of the current CDD release)
PRC-barrel domain found in photosynthetic reaction center (RC) complex, subunit H (PRCH)
Photosynthetic reaction center H (PRCH), also termed reaction center protein H chain, is a component of the reaction center (RC). RC is an integral membrane protein-pigment complex which catalyzes light-induced reduction of ubiquinone to ubiquinol, generating a transmembrane electrochemical gradient of protons used to produce ATP by ATP synthase. Subunit H is positioned mainly in the cytoplasm with one transmembrane alpha helix. It provides proton transfer pathway (water channels) connecting the terminal quinone electron acceptor of RC, to the aqueous phase. Members in this family are mainly found in photosynthetic bacteria: alpha, beta, and gamma proteobacteria.
Feature 1:polypeptide substrate binding site [polypeptide binding site]
Evidence:
Comment:The light-harvesting core antenna (LH1) and the reaction centre (RC) of purple photosynthetic bacteria form a supramolecular complex (LH1-RC) to use sunlight energy in a highly efficient manner.
Structure:3WMM: Thermochromatium tepidum reaction center (RC) complex subunit H (PRCH) interacts with other subunits of RC, contacts at 4A.
Jiyao W et al.(2023). "The conserved domain database in 2023.",