Homologous Superfamily

Light-harvesting complex (IPR035889)

Short name: Light-harvesting_complex

Overlapping entries

Description

Bacterial light-harvesting complexes are also known as the antenna complexes. This entry represents the membrane all-alpha fold found in the alpha- and beta-chains of the antenna complexes.

The antenna complexes of photosynthetic bacteria function as light-harvesting systems that absorb light and transfer the excitation energy to the reaction centres. The antenna complexes usually comprise 2 polypeptides (alpha- and beta-chains), 2-3 bacteriochlorophyll molecules and some carotenoids [PMID: 1577009, PMID: 1460542]. The alpha- and beta-chains are small proteins of 40-70 residues. Each has an N-terminal hydrophilic cytoplasmic domain, a single transmembrane (TM) region, and a small C-terminal hydrophilic periplasmic domain. In both chains, the TM domain houses a conserved His residue, presumed to be involved in binding the magnesium atom of a bacteriochlorophyll group. The beta-chains are characterised by a further histidine at the C-terminal extremity of the cytoplasmic domain, which is also thought to be involved in bacteriochlorophyll binding.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
GENE3D
SUPERFAMILY