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Protein

Photosystem II 12 kDa extrinsic protein

Gene

psbU

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

Functioni

Stabilizes the structure of photosystem II oxygen-evolving complex (OEC), the ion environment of oxygen evolution and protects the OEC against heat-induced inactivation. PSII is a light-driven water plastoquinone oxidoreductase, using light energy to abstract electrons from H2O, generating a proton gradient subsequently used for ATP formation.UniRule annotation3 Publications

Cofactori

Note: PSII binds multiple chlorophylls, carotenoids and specific lipids.UniRule annotation10 Publications

GO - Biological processi

Keywordsi

Biological processElectron transport, Photosynthesis, Transport

Enzyme and pathway databases

BioCyciTELO197221:G1G3I-2456-MONOMER

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem II 12 kDa extrinsic proteinUniRule annotation
Alternative name(s):
PS II complex 12 kDa extrinsic proteinUniRule annotation
PSII-UUniRule annotation
Gene namesi
Name:psbUUniRule annotation
Ordered Locus Names:tll2409
OrganismiThermosynechococcus elongatus (strain BP-1)
Taxonomic identifieri197221 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaSynechococcalesSynechococcaceaeThermosynechococcus
Proteomesi
  • UP000000440 Componenti: Chromosome

Subcellular locationi

GO - Cellular componenti

Keywords - Cellular componenti

Membrane, Photosystem II, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Signal peptidei1 – 30UniRule annotation1 PublicationAdd BLAST30
ChainiPRO_000002960231 – 134Photosystem II 12 kDa extrinsic proteinAdd BLAST104

Interactioni

Subunit structurei

The cyanobacterial oxygen-evolving complex is composed of PsbO, PsbP, PsbQ, PsbV and PsbU. PsbP and PsbQ are not seen in the crystal structures; however there is biochemical evidence that they are part of the OEC (By similarity). 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, 3 peripheral proteins PsbO, PsbU, PsbV and a large number of cofactors. It forms dimeric complexes.By similarity9 Publications

Protein-protein interaction databases

DIPiDIP-48501N
IntActiQ9F1L5, 1 interactor
STRINGi197221.tll2409

Structurei

Secondary structure

1134
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Helixi33 – 39Combined sources7
Helixi42 – 46Combined sources5
Helixi50 – 52Combined sources3
Beta strandi54 – 56Combined sources3
Turni57 – 59Combined sources3
Helixi62 – 67Combined sources6
Helixi74 – 82Combined sources9
Helixi88 – 93Combined sources6
Helixi99 – 107Combined sources9
Helixi109 – 111Combined sources3
Helixi119 – 122Combined sources4
Turni123 – 128Combined sources6

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1S5LX-ray3.50U/u1-134[»]
2AXTX-ray3.00U/u31-134[»]
3KZIX-ray3.60U31-134[»]
4FBYX-ray6.56U/h31-134[»]
4IXQX-ray5.70U/u1-134[»]
4IXRX-ray5.90U/u1-134[»]
4PBUX-ray5.00U/u38-134[»]
4PJ0X-ray2.44U/u1-134[»]
4RVYX-ray5.50U/u38-134[»]
4TNHX-ray4.90U/u1-134[»]
4TNIX-ray4.60U/u1-134[»]
4TNJX-ray4.50U/u1-134[»]
4TNKX-ray5.20U/u1-134[»]
4V62X-ray2.90AU/BU31-134[»]
4V82X-ray3.20AU/BU31-134[»]
5E79X-ray3.50U/u38-134[»]
5E7CX-ray4.50U/u38-134[»]
5H2FX-ray2.20U/u38-134[»]
5KAFX-ray3.00U/u1-134[»]
5KAIX-ray2.80U/u1-134[»]
5MX2X-ray2.20U/u1-134[»]
5TISX-ray2.25U/u1-134[»]
ProteinModelPortaliQ9F1L5
SMRiQ9F1L5
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiQ9F1L5

Family & Domainsi

Sequence similaritiesi

Belongs to the PsbU family.UniRule annotation

Keywords - Domaini

Signal

Phylogenomic databases

eggNOGiENOG41060KK Bacteria
ENOG41125ZV LUCA
HOGENOMiHOG000023243
KOiK02719
OMAiLLGCWGW
OrthoDBiPOG091H13VI

Family and domain databases

HAMAPiMF_00589 PSII_PsbU, 1 hit
InterProiView protein in InterPro
IPR010527 PSII_PsbU
PfamiView protein in Pfam
PF06514 PsbU, 1 hit

Sequencei

Sequence statusi: Complete.

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

Q9F1L5-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MQRLGRWLAL AYFVGVSLLG WINWSAPTLA ATASTEEELV NVVDEKLGTA
60 70 80 90 100
YGEKIDLNNT NIAAFIQYRG LYPTLAKLIV KNAPYESVED VLNIPGLTER
110 120 130
QKQILRENLE HFTVTEVETA LVEGGDRYNN GLYK
Length:134
Mass (Da):15,018
Last modified:March 1, 2001 - v1
Checksum:iC75346D2DA75447F
GO

Mass spectrometryi

Molecular mass is 11649±8 Da from positions 31 - 134. Determined by MALDI. 1 Publication
Molecular mass is 11641 Da from positions 31 - 134. Determined by MALDI. 1 Publication

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AB052848 Genomic DNA Translation: BAB20625.1
BA000039 Genomic DNA Translation: BAC09961.1
RefSeqiNP_683199.1, NC_004113.1
WP_011058241.1, NC_004113.1

Genome annotation databases

EnsemblBacteriaiBAC09961; BAC09961; BAC09961
GeneIDi1010437
KEGGitel:tll2409
PATRICifig|197221.4.peg.2532

Similar proteinsi

Entry informationi

Entry nameiPSBU_THEEB
AccessioniPrimary (citable) accession number: Q9F1L5
Entry historyiIntegrated into UniProtKB/Swiss-Prot: November 1, 2002
Last sequence update: March 1, 2001
Last modified: April 25, 2018
This is version 107 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
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Main funding by: National Institutes of Health