Phycoerythrin alpha chain (IPR004228)

Short name: Phycoerythr_a

Overlapping homologous superfamilies

Domain relationships



Cryptophytes are unicellular photosynthetic algae that use a lumenally located light-harvesting system, which is distinct from the phycobilisome structure found in cyanobacteria and red algae. One of the key components of this system is water-soluble phycoerythrin (PE) 545 whose expression is enhanced by low light levels [PMID: 10430868]. Phycoerythrin (PE) 545 is a heterodimeric of alpha(1)alpha(2)betabeta subunits. Each alpha subunit carries a covalently linked 15,16-dihydrobiliverdin chromophore that probably acts as the final energy acceptor. The architecture of the heterodimer suggests that PE 545 may dock to an acceptor protein via a deep cleft and that energy may be transferred via this intermediary protein to the reaction centre [PMID: 10430868].

The structure of this domain found in the alpha chain is a long beta-hairpin and a single alpha-helix.

GO terms

Biological Process

No terms assigned in this category.

Molecular Function

No terms assigned in this category.

Cellular Component

GO:0030089 phycobilisome

Contributing signatures

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