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Protein

B-phycoerythrin beta chain

Gene

cpeB

Organism
Rhodomonas sp. (strain CS 24) (Chroomonas sp. (strain CS24))
Status
Reviewed-Annotation score: -Experimental evidence at protein leveli

Functioni

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

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.

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Binding sitei28Phycoerythrobilin chromophore 32 Publications1
Binding sitei35Phycoerythrobilin chromophore 32 Publications1
Binding sitei39Phycoerythrobilin chromophore 32 Publications1
Binding sitei50Phycoerythrobilin chromophore 1 (covalent; via 2 links)2 Publications1
Binding sitei54Phycoerythrobilin chromophore 12 Publications1
Binding sitei61Phycoerythrobilin chromophore 1 (covalent; via 2 links)2 Publications1
Binding sitei72Phycoerythrobilin chromophore 22 Publications1
Binding sitei82Phycoerythrobilin chromophore 2 (covalent; via 1 link)2 Publications1
Binding sitei129Phycoerythrobilin chromophore 12 Publications1
Binding sitei158Phycoerythrobilin chromophore 3 (covalent; via 1 link)2 Publications1

GO - Biological processi

Keywordsi

Biological processElectron transport, Photosynthesis, Transport
LigandBile pigment, Chromophore

Names & Taxonomyi

Protein namesi
Recommended name:
B-phycoerythrin beta chain
Gene namesi
Name:cpeB
Encoded oniPlastid; Chloroplast
OrganismiRhodomonas sp. (strain CS 24) (Chroomonas sp. (strain CS24))
Taxonomic identifieri79257 [NCBI]
Taxonomic lineageiEukaryotaCryptophytaPyrenomonadalesPyrenomonadaceaeRhodomonas

Subcellular locationi

GO - Cellular componenti

Keywords - Cellular componenti

Chloroplast, Membrane, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00001992001 – 177B-phycoerythrin beta chainAdd BLAST177

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Modified residuei72N4-methylasparagine2 Publications1

Post-translational modificationi

Contains three covalently linked phycoerythrobilin chromophores.

Keywords - PTMi

Methylation

PTM databases

iPTMnetiP27198

Interactioni

Subunit structurei

Heterotetramer of 2 different alpha chains and 2 identical beta chains. The subunit composition could comprise any combination of 2 out of 4 different alpha units with an invariant beta unit.2 Publications

Structurei

Secondary structure

1177
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Helixi4 – 9Combined sources6
Beta strandi17 – 20Combined sources4
Helixi22 – 30Combined sources9
Helixi34 – 45Combined sources12
Helixi48 – 62Combined sources15
Helixi64 – 67Combined sources4
Helixi76 – 99Combined sources24
Helixi103 – 108Combined sources6
Turni109 – 112Combined sources4
Helixi113 – 120Combined sources8
Helixi124 – 142Combined sources19
Beta strandi146 – 148Combined sources3
Helixi159 – 176Combined sources18

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1QGWX-ray1.63C/D1-177[»]
1XF6X-ray1.10C/D1-177[»]
1XG0X-ray0.97C/D1-177[»]
ProteinModelPortaliP27198
SMRiP27198
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiP27198

Family & Domainsi

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Regioni77 – 78Phycoerythrobilin chromophore 2 binding2
Regioni82Phycoerythrobilin chromophore 2 binding1
Regioni147 – 148Phycoerythrobilin chromophore 1 binding2
Regioni154 – 158Phycoerythrobilin chromophore 3 binding5

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
PfamiView protein in Pfam
PF00502 Phycobilisome, 1 hit
PIRSFiPIRSF000081 Phycocyanin, 1 hit
SUPFAMiSSF46458 SSF46458, 1 hit

Sequencei

Sequence statusi: Complete.

P27198-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MLDAFSRVVT NADSKAAYVG GADLQALKKF ISEGNKRLDS VNSIVSNASC
60 70 80 90 100
IVSDAVSGMI CENPSLISPS GNCYTNRRMA ACLRDGEIIL RYVSYALLSG
110 120 130 140 150
DASVLEDRCL NGLKETYSSL GVPANSNARA VSIMKACAVA FVNNTASQKK
160 170
LSTPQGDCSG LASEVGGYFD KVTAAIS
Length:177
Mass (Da):18,508
Last modified:July 25, 2006 - v2
Checksum:i51008EFCF1D7C717
GO

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sequence conflicti50C → V AA sequence (PubMed:1554738).Curated1
Sequence conflicti56V → Y AA sequence (PubMed:1554738).Curated1
Sequence conflicti61C → E AA sequence (PubMed:1554738).Curated1
Sequence conflicti65S → H AA sequence (PubMed:1554738).Curated1
Sequence conflicti73C → E AA sequence (PubMed:1554738).Curated1

Similar proteinsi

Entry informationi

Entry nameiPHEB_RHDS2
AccessioniPrimary (citable) accession number: P27198
Entry historyiIntegrated into UniProtKB/Swiss-Prot: August 1, 1992
Last sequence update: July 25, 2006
Last modified: April 25, 2018
This is version 95 of the entry and version 2 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)

Miscellaneousi

Keywords - Technical termi

3D-structure, Direct protein sequencing
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Main funding by: National Institutes of Health