P23816 (PH62_CHRSP) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names	Recommended name: Phycocyanin-645 alpha-2 chain Short name=PC-645
Organism	Chroomonas sp.
Taxonomic identifier	3029 [NCBI]
Taxonomic lineage	cellular organisms › Eukaryota › Cryptophyta › Pyrenomonadales › Chroomonadaceae › Chroomonas

Protein attributes

Sequence length	80 AA.
Sequence status	Complete.
Protein existence	Evidence at protein level

General annotation (Comments)

Function	Photosynthetic bile pigment-protein complex with maximum absorption at approximately 697 nanometers.
Subunit structure	Heterotetramer of one alpha-1, one alpha-2, and two beta chains.
Subcellular location	Plastid › chloroplast thylakoid membrane; Peripheral membrane protein; Lumenal side.
Post-translational modification	Contains one covalently linked bilin chromophore.
Miscellaneous	The light-harvesting system in Cryptophytes contains phycobiliprotein complexes. Unusually they are composed of either phycoerythrin (CPE) or phycocyanin (CPC) but never allophycocyanin (APC), with only one type of biliprotein being present in any one species. Unlike cyanobacteria or red algae these proteins are not arranged into higher-order phycobilisome complexes, and they are found in the thylakoid lumen.
Sequence similarities	Belongs to the phycoerythrin family.

Ontologies

Keywords
Biological process	Electron transport Photosynthesis Transport
Cellular component	Chloroplast Membrane Plastid Thylakoid
Ligand	Bile pigment Chromophore
Technical term	Direct protein sequencing
Gene Ontology (GO)
Biological_process	electron transport chain Inferred from electronic annotation. Source: UniProtKB-KW photosynthesis Inferred from electronic annotation. Source: UniProtKB-KW protein-chromophore linkage Inferred from electronic annotation. Source: UniProtKB-KW
Cellular_component	chloroplast thylakoid membrane Inferred from electronic annotation. Source: UniProtKB-SubCell phycobilisome Inferred from electronic annotation. Source: InterPro
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Chain	1 – 80	80	Phycocyanin-645 alpha-2 chain		PRO_0000199211
Sites
	Binding site	18	1	Phycocyanobilin chromophore (covalent; via 1 link) Ref.1

Sequences

	Sequence		Length	Mass (Da)
	P23816 [UniParc]. Last modified November 1, 1991. Version 1. Checksum: AFC7529A3E8D6D56	FASTA	80	8,814
	10 20 30 40 50 60 KNGDLRAPYV EIFDARGCDA KNSQYTGPKS GDMNDDQCVK VSMAVPKVSE ATAEKKRQEF 70 80 LGFKETAINV PQIAGKTKKY

References

[1]	"The complete amino-acid sequence and the phylogenetic origin of phycocyanin-645 from the cryptophytan alga Chroomonas sp." Sidler W., Nutt H., Kumpf B., Frank G., Suter F., Brenzel A., Wehrmeyer W., Zuber H. Biol. Chem. Hoppe-Seyler 371:537-547(1990) [PubMed] [Europe PMC] [Abstract] Cited for: PROTEIN SEQUENCE.
[2]	"Structural studies on cryptomonad biliprotein subunits. Two different alpha-subunits in Chroomonas phycocyanin-645 and Cryptomonas phycoerythrin-545." Sidler W., Kumpf B., Suter F., Morisset W., Wehrmeyer W., Zuber H. Biol. Chem. Hoppe-Seyler 366:233-244(1985) [PubMed] [Europe PMC] [Abstract] Cited for: PROTEIN SEQUENCE OF 1-69.

Cross-references

Sequence databases
PIR	S10603.
3D structure databases
ProteinModelPortal	P23816.
ModBase	Search...
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Family and domain databases
Gene3D	3.90.510.10. 1 hit.
InterPro	IPR011070. Globular_prot_asu/bsu. IPR004228. Phycoerythr_a/b_core. [Graphical view]
Pfam	PF02972. Phycoerythr_ab. 1 hit. [Graphical view]
ProDom	PD019398. Phycoerythr_a/b_core. 1 hit. [Graphical view] [Entries sharing at least one domain]
SUPFAM	SSF56568. AlphaBeta_subunt. 1 hit.
ProtoNet	Search...

Entry information

Entry name

PH62_CHRSP

Accession

Primary (citable) accession number: P23816

Entry history

Integrated into UniProtKB/Swiss-Prot:	November 1, 1991
Last sequence update:	November 1, 1991
Last modified:	April 3, 2013
This is version 55 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)