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Protein

Photosystem II reaction center protein I

Gene

psbI

Organism
Cyanidium caldarium (Red alga)
Status
Reviewed-Annotation score: Annotation score: 2 out of 5-Experimental evidence at protein leveli

Functioni

One of the components of the core complex of photosystem II (PSII), required for its stability and/or assembly. 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

GO - Biological processi

Keywordsi

Biological processPhotosynthesis

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem II reaction center protein IUniRule annotation
Short name:
PSII-IUniRule annotation
Alternative name(s):
PSII 4.8 kDa proteinUniRule annotation
Gene namesi
Name:psbIUniRule 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
Transmembranei4 – 24HelicalUniRule annotationAdd BLAST21

GO - Cellular componenti

Keywords - Cellular componenti

Chloroplast, Membrane, Photosystem II, Plastid, Reaction center, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00002196231 – 38Photosystem II reaction center protein IAdd BLAST38

Interactioni

Subunit structurei

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-ray2.77I1/I2/i1/i21-38[»]
ProteinModelPortaliO19882.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the PsbI family.UniRule annotation

Keywords - Domaini

Transmembrane, Transmembrane helix

Family and domain databases

HAMAPiMF_01316. PSII_PsbI. 1 hit.
InterProiView protein in InterPro
IPR003686. PSII_PsbI.
PfamiView protein in Pfam
PF02532. PsbI. 1 hit.

Sequencei

Sequence statusi: Complete.

O19882-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30 
MFTLKIFVYS CVAFFCSLFI FGFLSNDPSR NPNRKDLE
Length:38
Mass (Da):4,468
Last modified:January 1, 1998 - v1
Checksum:iC0413E3807FCEB5A
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AF022186 Genomic DNA. Translation: AAB82707.1.
PIRiT11950.
RefSeqiNP_045054.1. NC_001840.1.

Genome annotation databases

GeneIDi800258.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AF022186 Genomic DNA. Translation: AAB82707.1.
PIRiT11950.
RefSeqiNP_045054.1. NC_001840.1.

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
4YUUX-ray2.77I1/I2/i1/i21-38[»]
ProteinModelPortaliO19882.
ModBaseiSearch...
MobiDBiSearch...

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

GeneIDi800258.

Family and domain databases

HAMAPiMF_01316. PSII_PsbI. 1 hit.
InterProiView protein in InterPro
IPR003686. PSII_PsbI.
PfamiView protein in Pfam
PF02532. PsbI. 1 hit.
ProtoNetiSearch...

Entry informationi

Entry nameiPSBI_CYACA
AccessioniPrimary (citable) accession number: O19882
Entry historyiIntegrated into UniProtKB/Swiss-Prot: July 15, 1998
Last sequence update: January 1, 1998
Last modified: March 15, 2017
This is version 63 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.