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Protein

R-phycocyanin alpha chain

Gene

rpcA

Organism
Polysiphonia urceolata (Red alga) (Conferva urceolata)
Status
Reviewed-Annotation score: -Experimental evidence at protein leveli

Functioni

Light-harvesting photosynthetic tetrapyrrole chromophore-protein from the phycobiliprotein complex.1 Publication

Miscellaneous

The light-harvesting antenna system in red algae and cyanobacteria is formed of phycobilisomes. These are composed of the phycobiliproteins phycoerythrin (CPE), phycocyanin (CPC) and allophycocyanin (APC). Cyanobacteria also contain phycoerythrocyanin (PCC). The phycobiliproteins all share the same subunit composition and organization with variations in the covalently bound open-chain tetrapyrrole chromophores. The phycobiliprotein complexes are arranged sequentially in antenna complexes linked by linker proteins with CPE at the periphery, CPC in the middle and APC at the core feeding to the photosynthetic reaction center.

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Binding sitei84Phycocyanobilin chromophore (covalent; via 1 link)1 Publication1

GO - Biological processi

Keywordsi

Biological processElectron transport, Photosynthesis, Transport
LigandBile pigment, Chromophore

Names & Taxonomyi

Protein namesi
Recommended name:
R-phycocyanin alpha chain
Gene namesi
Name:rpcA
Encoded oniPlastid; Chloroplast
OrganismiPolysiphonia urceolata (Red alga) (Conferva urceolata)
Taxonomic identifieri65404 [NCBI]
Taxonomic lineageiEukaryotaRhodophytaFlorideophyceaeRhodymeniophycidaeCeramialesRhodomelaceaePolysiphonioideaePolysiphonia

Subcellular locationi

GO - Cellular componenti

Keywords - Cellular componenti

Chloroplast, Membrane, Phycobilisome, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00001991351 – 162R-phycocyanin alpha chainAdd BLAST162

Post-translational modificationi

Contains one covalently linked phycocyanobilin chromophore.

Interactioni

Subunit structurei

Heterododecamer of 6 alpha and 6 beta chains. The basic functional unit of phycobiliproteins is a ring-shaped hexamer formed from two back-to-back trimers contacting via the alpha chain subunits. The trimers are composed of alpha/beta subunit heterodimers arranged around a three-fold axis of symmetry. The phycoerythrins also contain a gamma subunit which is located in the center of the hexamer.1 Publication

Structurei

Secondary structure

1162
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Helixi4 – 14Combined sources11
Helixi21 – 46Combined sources26
Helixi48 – 62Combined sources15
Helixi65 – 68Combined sources4
Beta strandi74 – 77Combined sources4
Helixi78 – 101Combined sources24
Helixi105 – 110Combined sources6
Turni111 – 114Combined sources4
Helixi115 – 121Combined sources7
Helixi126 – 139Combined sources14
Helixi144 – 161Combined sources18

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1F99X-ray2.40A/K/M1-162[»]
ProteinModelPortaliP59858
SMRiP59858
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiP59858

Family & Domainsi

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Regioni83 – 87Phycocyanobilin chromophore-binding5
Regioni115 – 124Phycocyanobilin chromophore-binding10

Sequence similaritiesi

Belongs to the phycobiliprotein family.Curated

Family and domain databases

Gene3Di1.10.490.20, 1 hit
InterProiView protein in InterPro
IPR009050 Globin-like_sf
IPR012128 Phycobilisome_asu/bsu
IPR038719 Phycobilisome_asu/bsu_sf
IPR006246 Phycocyanin_a
PfamiView protein in Pfam
PF00502 Phycobilisome, 1 hit
PIRSFiPIRSF000081 Phycocyanin, 1 hit
SUPFAMiSSF46458 SSF46458, 1 hit
TIGRFAMsiTIGR01338 phycocy_alpha, 1 hit

Sequencei

Sequence statusi: Complete.

P59858-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MKTPLTEAIA AADSQGRFLS NTELQVVNGR YNRATSSLEA AKALTANADR
60 70 80 90 100
LISGAANAVY SKFPYTTQMP GPNYSSTAIG KAKCARDIGY YLRMVTYCLV
110 120 130 140 150
VGGTGPMDDY LVAGLEEINR TFELSPSWYI EALKYIKNNH GLSGDVANEA
160
NTYIDYAINT LS
Length:162
Mass (Da):17,570
Last modified:September 26, 2003 - v1
Checksum:i6DC32AE0BB371BA2
GO

Similar proteinsi

Entry informationi

Entry nameiPHCA_POLUR
AccessioniPrimary (citable) accession number: P59858
Entry historyiIntegrated into UniProtKB/Swiss-Prot: September 26, 2003
Last sequence update: September 26, 2003
Last modified: April 25, 2018
This is version 68 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)

Miscellaneousi

Keywords - Technical termi

3D-structure

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