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Protein

Photosystem II reaction center protein K

Gene

psbK

Organism
Thermosynechococcus elongatus (strain BP-1)
Status
Reviewed-Annotation score: Annotation score: 5 out of 5-Experimental evidence at protein leveli

Functioni

One of the components of the core complex 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. Required for association of PsbZ and Ycf12 with PSII (PubMed:20194360).UniRule annotation4 Publications

Cofactori

Note: PSII binds multiple chlorophylls, carotenoids and specific lipids.11 Publications

GO - Biological processi

Keywordsi

Biological processPhotosynthesis

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem II reaction center protein KUniRule annotation
Short name:
PSII-KUniRule annotation
Gene namesi
Name:psbKUniRule annotation
Ordered Locus Names:tsl0176
OrganismiThermosynechococcus elongatus (strain BP-1)
Taxonomic identifieri197221 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaSynechococcalesSynechococcaceaeThermosynechococcus
Proteomesi
  • UP000000440 Componenti: Chromosome

Subcellular locationi

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Topological domaini10 – 24Lumenal1 PublicationAdd BLAST15
Transmembranei25 – 38Helical1 PublicationAdd BLAST14
Topological domaini39 – 46Cytoplasmic1 Publication8

GO - Cellular componenti

Keywords - Cellular componenti

Membrane, Photosystem II, Reaction center, Thylakoid

Pathology & Biotechi

Disruption phenotypei

No changes in growth under low, medium or high light regimes (3-300 µmol photon7/2/s). PsbZ and Ycf12 are missing from isolated PSII, although low levels of PsbZ can be detected in thylakoid membranes.1 Publication

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
PropeptideiPRO_00000295431 – 9UniRule annotation2 Publications9
ChainiPRO_000002954410 – 46Photosystem II reaction center protein KUniRule annotationAdd BLAST37

Proteomic databases

PRIDEiQ9F1K9.

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-48496N.
STRINGi197221.tsl0176.

Structurei

Secondary structure

146
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Helixi13 – 18Combined sources6
Helixi19 – 22Combined sources4
Helixi25 – 27Combined sources3
Helixi28 – 43Combined sources16

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1S5LX-ray3.50K/k10-46[»]
2AXTX-ray3.00K/k10-46[»]
3KZIX-ray3.60K10-46[»]
4FBYX-ray6.56K/c10-46[»]
4IXQX-ray5.70K/k1-46[»]
4IXRX-ray5.90K/k1-46[»]
4PBUX-ray5.00K/k10-46[»]
4PJ0X-ray2.44K/k1-46[»]
4RVYX-ray5.50K/k10-46[»]
4TNHX-ray4.90K/k1-46[»]
4TNIX-ray4.60K/k1-46[»]
4TNJX-ray4.50K/k1-46[»]
4TNKX-ray5.20K/k1-46[»]
4V62X-ray2.90AK/BK10-46[»]
4V82X-ray3.20AK/BK10-46[»]
5E7CX-ray4.50K/k10-46[»]
5KAFX-ray3.00K/k1-46[»]
5KAIX-ray2.80K/k1-46[»]
5TISX-ray2.25K/k1-46[»]
ProteinModelPortaliQ9F1K9.
SMRiQ9F1K9.
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiQ9F1K9.

Family & Domainsi

Sequence similaritiesi

Belongs to the PsbK family.UniRule annotation

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

eggNOGiENOG4106815. Bacteria.
ENOG410XW72. LUCA.
HOGENOMiHOG000111611.
KOiK02712.

Family and domain databases

HAMAPiMF_00441. PSII_PsbK. 1 hit.
InterProiView protein in InterPro
IPR003687. PSII_PsbK.
PfamiView protein in Pfam
PF02533. PsbK. 1 hit.
ProDomiView protein in ProDom or Entries sharing at least one domain
PD004458. PSII_PsbK. 1 hit.

Sequencei

Sequence statusi: Complete.

Sequence processingi: The displayed sequence is further processed into a mature form.

Q9F1K9-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40 
MIDALVLVAK LPEAYAIFDP LVDVLPVIPV LFLALAFVWQ AAVGFR
Length:46
Mass (Da):5,026
Last modified:March 1, 2001 - v1
Checksum:i45C5197F4B50E398
GO

Mass spectrometryi

Molecular mass is 4103±4 Da from positions 10 - 46. Determined by MALDI. 1 Publication
Molecular mass is 4101 Da from positions 10 - 46. Determined by MALDI. 1 Publication

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AB052850 Genomic DNA. Translation: BAB20628.1.
BA000039 Genomic DNA. Translation: BAC07729.1.
RefSeqiNP_680967.1. NC_004113.1.
WP_011056031.1. NC_004113.1.

Genome annotation databases

EnsemblBacteriaiBAC07729; BAC07729; BAC07729.
GeneIDi1010273.
KEGGitel:tsl0176.
PATRICi23925544. VBITheElo119873_0182.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AB052850 Genomic DNA. Translation: BAB20628.1.
BA000039 Genomic DNA. Translation: BAC07729.1.
RefSeqiNP_680967.1. NC_004113.1.
WP_011056031.1. NC_004113.1.

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1S5LX-ray3.50K/k10-46[»]
2AXTX-ray3.00K/k10-46[»]
3KZIX-ray3.60K10-46[»]
4FBYX-ray6.56K/c10-46[»]
4IXQX-ray5.70K/k1-46[»]
4IXRX-ray5.90K/k1-46[»]
4PBUX-ray5.00K/k10-46[»]
4PJ0X-ray2.44K/k1-46[»]
4RVYX-ray5.50K/k10-46[»]
4TNHX-ray4.90K/k1-46[»]
4TNIX-ray4.60K/k1-46[»]
4TNJX-ray4.50K/k1-46[»]
4TNKX-ray5.20K/k1-46[»]
4V62X-ray2.90AK/BK10-46[»]
4V82X-ray3.20AK/BK10-46[»]
5E7CX-ray4.50K/k10-46[»]
5KAFX-ray3.00K/k1-46[»]
5KAIX-ray2.80K/k1-46[»]
5TISX-ray2.25K/k1-46[»]
ProteinModelPortaliQ9F1K9.
SMRiQ9F1K9.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

DIPiDIP-48496N.
STRINGi197221.tsl0176.

Proteomic databases

PRIDEiQ9F1K9.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiBAC07729; BAC07729; BAC07729.
GeneIDi1010273.
KEGGitel:tsl0176.
PATRICi23925544. VBITheElo119873_0182.

Phylogenomic databases

eggNOGiENOG4106815. Bacteria.
ENOG410XW72. LUCA.
HOGENOMiHOG000111611.
KOiK02712.

Miscellaneous databases

EvolutionaryTraceiQ9F1K9.

Family and domain databases

HAMAPiMF_00441. PSII_PsbK. 1 hit.
InterProiView protein in InterPro
IPR003687. PSII_PsbK.
PfamiView protein in Pfam
PF02533. PsbK. 1 hit.
ProDomiView protein in ProDom or Entries sharing at least one domain
PD004458. PSII_PsbK. 1 hit.
ProtoNetiSearch...

Entry informationi

Entry nameiPSBK_THEEB
AccessioniPrimary (citable) accession number: Q9F1K9
Entry historyiIntegrated into UniProtKB/Swiss-Prot: August 29, 2001
Last sequence update: March 1, 2001
Last modified: March 15, 2017
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

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.