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Protein

Cytochrome b559 subunit alpha

Gene

psbE

Organism
Cyanidium caldarium (Red alga)
Status
Reviewed-Annotation score: Annotation score: 3 out of 5-Experimental evidence at protein leveli

Functioni

This b-type cytochrome is tightly associated with the reaction center of photosystem II (PSII). PSII is a light-driven water:plastoquinone oxidoreductase that uses light energy to abstract electrons from H2O, generating O2 and a proton gradient subsequently used for ATP formation. It consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation.UniRule annotation

Cofactori

heme bUniRule annotationNote: With its partner (PsbF) binds heme. PSII binds additional chlorophylls, carotenoids and specific lipids.UniRule annotation

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Metal bindingi24Iron (heme axial ligand); shared with beta subunitUniRule annotation1

GO - Molecular functioni

GO - Biological processi

Keywordsi

Biological processElectron transport, Photosynthesis, Transport
LigandHeme, Iron, Metal-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Cytochrome b559 subunit alphaUniRule annotation
Alternative name(s):
PSII reaction center subunit VUniRule annotation
Gene namesi
Name:psbEUniRule annotation
Encoded oniPlastid; Chloroplast
OrganismiCyanidium caldarium (Red alga)
Taxonomic identifieri2771 [NCBI]
Taxonomic lineageiEukaryotaRhodophytaBangiophyceaeCyanidialesCyanidiaceaeCyanidium

Subcellular locationi

  • Plastidchloroplast thylakoid membrane UniRule annotation; Single-pass membrane protein UniRule annotation

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transmembranei22 – 36HelicalUniRule annotationAdd BLAST15

GO - Cellular componenti

Keywords - Cellular componenti

Chloroplast, Membrane, Photosystem II, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00002003061 – 84Cytochrome b559 subunit alphaAdd BLAST84

Interactioni

Subunit structurei

Heterodimer of an alpha subunit and a beta subunit. PSII is composed of 1 copy each of membrane proteins PsbA, PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK, PsbL, PsbM, PsbT, PsbX, PsbY, PsbZ, Ycf12, at least 3 peripheral proteins of the oxygen-evolving complex and a large number of cofactors. It forms dimeric complexes.UniRule annotation

Structurei

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
4YUUX-ray2.77E1/E2/e1/e21-84[»]
ProteinModelPortaliQ9TM20.
SMRiQ9TM20.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the PsbE/PsbF family.UniRule annotation

Keywords - Domaini

Transmembrane, Transmembrane helix

Family and domain databases

Gene3Di1.20.5.860. 1 hit.
HAMAPiMF_00642. PSII_PsbE. 1 hit.
InterProiView protein in InterPro
IPR006217. PSII_cyt_b559_asu.
IPR006216. PSII_cyt_b559_CS.
IPR013081. PSII_cyt_b559_N.
IPR013082. PSII_cytb559_asu_lum.
PANTHERiPTHR33391:SF12. PTHR33391:SF12. 1 hit.
PfamiView protein in Pfam
PF00283. Cytochrom_B559. 1 hit.
PF00284. Cytochrom_B559a. 1 hit.
PIRSFiPIRSF000036. PsbE. 1 hit.
TIGRFAMsiTIGR01332. cyt_b559_alpha. 1 hit.
PROSITEiView protein in PROSITE
PS00537. CYTOCHROME_B559. 1 hit.

Sequencei

Sequence statusi: Complete.

Q9TM20-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MSGGSTGERP FSDIITSVRY WVIHSITIPS LFIAGWLFVS TGLAYDVFGT
60 70 80
PRPNEYFSEN RQQVPLINDR FNAREELDDL TSNL
Length:84
Mass (Da):9,528
Last modified:May 1, 2000 - v1
Checksum:i7E86CB72B3A17BBA
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AF022186 Genomic DNA. Translation: AAF12999.1.
RefSeqiNP_045047.1. NC_001840.1.

Genome annotation databases

GeneIDi800180.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AF022186 Genomic DNA. Translation: AAF12999.1.
RefSeqiNP_045047.1. NC_001840.1.

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
4YUUX-ray2.77E1/E2/e1/e21-84[»]
ProteinModelPortaliQ9TM20.
SMRiQ9TM20.
ModBaseiSearch...
MobiDBiSearch...

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

GeneIDi800180.

Family and domain databases

Gene3Di1.20.5.860. 1 hit.
HAMAPiMF_00642. PSII_PsbE. 1 hit.
InterProiView protein in InterPro
IPR006217. PSII_cyt_b559_asu.
IPR006216. PSII_cyt_b559_CS.
IPR013081. PSII_cyt_b559_N.
IPR013082. PSII_cytb559_asu_lum.
PANTHERiPTHR33391:SF12. PTHR33391:SF12. 1 hit.
PfamiView protein in Pfam
PF00283. Cytochrom_B559. 1 hit.
PF00284. Cytochrom_B559a. 1 hit.
PIRSFiPIRSF000036. PsbE. 1 hit.
TIGRFAMsiTIGR01332. cyt_b559_alpha. 1 hit.
PROSITEiView protein in PROSITE
PS00537. CYTOCHROME_B559. 1 hit.
ProtoNetiSearch...

Entry informationi

Entry nameiPSBE_CYACA
AccessioniPrimary (citable) accession number: Q9TM20
Entry historyiIntegrated into UniProtKB/Swiss-Prot: June 1, 2001
Last sequence update: May 1, 2000
Last modified: March 15, 2017
This is version 82 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)

Miscellaneousi

Keywords - Technical termi

3D-structure

Documents

  1. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  2. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.