Summary: Phycobilisome protein
Phycobilisome protein Provide feedback
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This tab holds annotation information from the InterPro database.
InterPro entry IPR012128
Cyanobacteria and red algae harvest light through water-soluble complexes, called phycobilisomes, which are attached to the outer face of the thylakoid membrane [PUBMED:15238265]. These complexes are capable of transferring the absorbed energy to the photosynthetic reaction centre with greater than 95% efficiency. Phycobilisomes contain various photosynthetic light harvesting proteins known as biliproteins, and linker proteins which help assemble the structure. The two main structural elements of the complex are a core located near the photosynthetic reaction centre, and rods attached to this core. Allophycocyanin is the major component of the core, while the rods contain phycocyanins, phycoerythrins and linker proteins. The rod biliproteins harvest photons, with the excitation energy being passed through the rods into the allophycocyanin in the core. Other core biliproteins subsequently pass this energy to chlorophyll within the thylakoid membrane.
This entry represents the alpha and beta subunits found in biliproteins from cyanobacteria and red algae. Structural studies indicate that the basic structural unit of most biliproteins is a heterodimer composed of these alpha and beta subunits [PUBMED:10388620, PUBMED:11134927, PUBMED:11463658, PUBMED:7783202]. The full protein is a ring-like trimer assembly of these heterodimers. Each subunit of the heterodimer has eight helices and binds chromophores through thioester bonds formed at particular cysteine residues. These chromophores, also known as bilins, are open-chain tetrapyrroles whose number and type vary with the particular biliprotein eg R-phyocerythrin binds five phycoerythrobilins per heterodimer, while allophycocyanin binds two phycocyanobilins per heterodimer.
The mapping between Pfam and Gene Ontology is provided by InterPro. If you use this data please cite InterPro.
|Cellular component||phycobilisome (GO:0030089)|
|Biological process||photosynthesis (GO:0015979)|
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Curation and family details
|Seed source:||Pfam-B_10 (release 1.0)|
|Number in seed:||22|
|Number in full:||4056|
|Average length of the domain:||96.30 aa|
|Average identity of full alignment:||32 %|
|Average coverage of the sequence by the domain:||84.97 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||14|
|Download:||download the raw HMM for this family|
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For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the Phycobilisome domain has been found. There are 188 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.
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