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Protein

Photosystem II reaction center protein I

Gene

psbI

Organism
Thermosynechococcus elongatus (strain BP-1)
Status
Reviewed-Annotation score: -Experimental evidence at protein leveli

Functioni

One of the components of the core complex of photosystem II (PSII). May be required for formation of PSII dimers but not their subsequent stability (PubMed:21195048). 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 annotation4 Publications

Cofactori

Note: PSII binds multiple chlorophylls, carotenoids and specific lipids.10 Publications

GO - Biological processi

Keywordsi

Biological processPhotosynthesis

Enzyme and pathway databases

BioCyciTELO197221:G1G3I-1094-MONOMER

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem II reaction center protein IUniRule annotation
Short name:
PSII-IUniRule annotation
Alternative name(s):
PSII 4.4 kDa proteinUniRule annotation
Gene namesi
Name:psbIUniRule annotation
Ordered Locus Names:tsr1074
OrganismiThermosynechococcus elongatus (strain BP-1)
Taxonomic identifieri197221 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaSynechococcalesSynechococcaceaeThermosynechococcus
Proteomesi
  • UP000000440 Componenti: Chromosome

Subcellular locationi

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Topological domaini1 – 5Lumenal1 Publication5
Transmembranei6 – 21Helical1 PublicationAdd BLAST16
Topological domaini22 – 38Cytoplasmic1 PublicationAdd BLAST17

GO - Cellular componenti

Keywords - Cellular componenti

Membrane, Photosystem II, Reaction center, Thylakoid

Pathology & Biotechi

Disruption phenotypei

Decreased yields of PSII dimers with increased PSII monomers, slightly slower photoautotrophic growth, about 20% less oxygen evolution. Formed PSII dimers are stable.1 Publication

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00002196601 – 38Photosystem II reaction center protein IAdd BLAST38

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Modified residuei1N-formylmethionine2 Publications1

Keywords - PTMi

Formylation

Interactioni

Subunit structurei

Cyanobacterial 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 PsbO, PsbU, PsbV and a large number of cofactors. It forms dimeric complexes.UniRule annotation10 Publications

Protein-protein interaction databases

DIPiDIP-48494N
IntActiQ8DJZ6, 1 interactor
STRINGi197221.tsr1074

Structurei

Secondary structure

138
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Helixi2 – 24Combined sources23
Helixi27 – 29Combined sources3
Beta strandi31 – 33Combined sources3

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1S5LX-ray3.50I/i1-38[»]
2AXTX-ray3.00I/i1-38[»]
3KZIX-ray3.60I1-38[»]
4FBYX-ray6.56I/a1-38[»]
4IXQX-ray5.70I/i1-38[»]
4IXRX-ray5.90I/i1-38[»]
4PBUX-ray5.00I/i1-38[»]
4PJ0X-ray2.44I/i1-38[»]
4RVYX-ray5.50I/i1-38[»]
4TNHX-ray4.90I/i1-38[»]
4TNIX-ray4.60I/i1-38[»]
4TNJX-ray4.50I/i1-38[»]
4TNKX-ray5.20I/i1-38[»]
4V62X-ray2.90AI/BI1-38[»]
4V82X-ray3.20AI/BI1-38[»]
5E79X-ray3.50I/i1-38[»]
5E7CX-ray4.50I/i1-38[»]
5H2FX-ray2.20I/i1-36[»]
5KAFX-ray3.00I/i2-38[»]
5KAIX-ray2.80I/i2-38[»]
5MX2X-ray2.20I/i1-38[»]
5TISX-ray2.25I/i1-38[»]
ProteinModelPortaliQ8DJZ6
SMRiQ8DJZ6
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiQ8DJZ6

Family & Domainsi

Sequence similaritiesi

Belongs to the PsbI family.UniRule annotation

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

HOGENOMiHOG000252218
KOiK02710

Family and domain databases

HAMAPiMF_01316 PSII_PsbI, 1 hit
InterProiView protein in InterPro
IPR003686 PSII_PsbI
IPR037271 PSII_PsbI_sf
PANTHERiPTHR35772 PTHR35772, 1 hit
PfamiView protein in Pfam
PF02532 PsbI, 1 hit
SUPFAMiSSF161041 SSF161041, 1 hit

Sequencei

Sequence statusi: Complete.

Q8DJZ6-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30 
METLKITVYI VVTFFVLLFV FGFLSGDPAR NPKRKDLE
Length:38
Mass (Da):4,405
Last modified:March 1, 2003 - v1
Checksum:i02DDC30594997948
GO

Mass spectrometryi

Molecular mass is 4437±4 Da from positions 1 - 38. Determined by MALDI. 1 Publication
Molecular mass is 4435 Da from positions 1 - 38. Determined by MALDI. 1 Publication

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AB052849 Genomic DNA Translation: BAB20622.1
BA000039 Genomic DNA Translation: BAC08627.1
RefSeqiNP_681865.1, NC_004113.1
WP_011056917.1, NC_004113.1

Genome annotation databases

EnsemblBacteriaiBAC08627; BAC08627; BAC08627
GeneIDi1012309
KEGGitel:tsr1074
PATRICifig|197221.4.peg.1129

Similar proteinsi

Entry informationi

Entry nameiPSBI_THEEB
AccessioniPrimary (citable) accession number: Q8DJZ6
Secondary accession number(s): Q9F1L2
Entry historyiIntegrated into UniProtKB/Swiss-Prot: July 3, 2003
Last sequence update: March 1, 2003
Last modified: April 25, 2018
This is version 98 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

3D-structure, Complete proteome, Direct protein sequencing, Reference proteome

Documents

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

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