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Protein

Photosystem II reaction center X protein

Gene

psbX

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

Functioni

Involved in the binding and/or turnover of quinones at the Q(B) site of Photosystem II. 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.4 Publications

Cofactori

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

GO - Biological processi

Keywordsi

Biological processPhotosynthesis

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem II reaction center X protein
Gene namesi
Name:psbX
Ordered Locus Names:tsr2013
OrganismiThermosynechococcus elongatus (strain BP-1)
Taxonomic identifieri197221 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaSynechococcalesSynechococcaceaeThermosynechococcus
Proteomesi
  • UP000000440 Componenti: Chromosome

Subcellular locationi

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Topological domaini2 – 12Lumenal1 PublicationAdd BLAST11
Transmembranei13 – 27Helical1 PublicationAdd BLAST15
Topological domaini28 – 41Cytoplasmic1 PublicationAdd BLAST14

GO - Cellular componenti

Keywords - Cellular componenti

Membrane, Photosystem II, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Initiator methionineiRemoved2 Publications
ChainiPRO_00003453782 – 41Photosystem II reaction center X proteinAdd BLAST40

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, 3 peripheral proteins PsbO, PsbU, PsbV and a large number of cofactors. It forms dimeric complexes.8 Publications

Protein-protein interaction databases

DIPiDIP-48503N.
STRINGi197221.tsr2013.

Structurei

Secondary structure

141
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Helixi5 – 34Combined sources30

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1S5LX-ray3.50X/x2-41[»]
3KZIX-ray3.60X2-41[»]
4FBYX-ray6.56X/j2-41[»]
4IXQX-ray5.70X/x1-41[»]
4IXRX-ray5.90X/x1-41[»]
4PBUX-ray5.00X/x2-40[»]
4PJ0X-ray2.44X/x1-41[»]
4RVYX-ray5.50X/x2-40[»]
4TNHX-ray4.90X/x1-41[»]
4TNIX-ray4.60X/x1-41[»]
4TNJX-ray4.50X/x1-41[»]
4TNKX-ray5.20X/x1-41[»]
4V62X-ray2.90AX/BX2-41[»]
4V82X-ray3.20AX/BX1-41[»]
5E7CX-ray4.50X/x2-40[»]
5KAFX-ray3.00X/x1-41[»]
5KAIX-ray2.80X/x1-41[»]
5TISX-ray2.25X/x1-41[»]
ProteinModelPortaliQ9F1R6.
SMRiQ9F1R6.
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiQ9F1R6.

Family & Domainsi

Sequence similaritiesi

Belongs to the PsbX family. Type 1 subfamily.Curated

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

KOiK02722.
OrthoDBiPOG091H15OC.

Family and domain databases

HAMAPiMF_01386. PSII_PsbX_1. 1 hit.
InterProiView protein in InterPro
IPR009518. PSII_PsbX.
IPR023431. PSII_PsbX_type_1_subfam.
PfamiView protein in Pfam
PF06596. PsbX. 1 hit.

Sequencei

Sequence statusi: Complete.

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

Q9F1R6-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40 
MTITPSLKGF FIGLLSGAVV LGLTFAVLIA ISQIDKVQRS L
Length:41
Mass (Da):4,319
Last modified:July 22, 2008 - v2
Checksum:i1DDD01F2CC391048
GO

Sequence cautioni

The sequence BAB16114 differs from that shown. Reason: Erroneous initiation. Translation N-terminally shortened.Curated
The sequence BAC09565 differs from that shown. Reason: Erroneous initiation. Translation N-terminally shortened.Curated

Mass spectrometryi

Molecular mass is 4192±4 Da from positions 2 - 41. Determined by MALDI. Authors suggest the N-terminus may result from processing of a signal peptide.1 Publication
Molecular mass is 4190 Da from positions 2 - 41. Determined by MALDI. Authors suggest the N-terminus may result from processing of a signal peptide.1 Publication

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AB046708 Genomic DNA. Translation: BAB16114.1. Different initiation.
BA000039 Genomic DNA. Translation: BAC09565.1. Different initiation.
RefSeqiNP_682803.1. NC_004113.1.
WP_011057848.1. NC_004113.1.

Genome annotation databases

EnsemblBacteriaiBAC09565; BAC09565; BAC09565.
GeneIDi1011760.
KEGGitel:tsr2013.
PATRICi23929440. VBITheElo119873_2106.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AB046708 Genomic DNA. Translation: BAB16114.1. Different initiation.
BA000039 Genomic DNA. Translation: BAC09565.1. Different initiation.
RefSeqiNP_682803.1. NC_004113.1.
WP_011057848.1. NC_004113.1.

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1S5LX-ray3.50X/x2-41[»]
3KZIX-ray3.60X2-41[»]
4FBYX-ray6.56X/j2-41[»]
4IXQX-ray5.70X/x1-41[»]
4IXRX-ray5.90X/x1-41[»]
4PBUX-ray5.00X/x2-40[»]
4PJ0X-ray2.44X/x1-41[»]
4RVYX-ray5.50X/x2-40[»]
4TNHX-ray4.90X/x1-41[»]
4TNIX-ray4.60X/x1-41[»]
4TNJX-ray4.50X/x1-41[»]
4TNKX-ray5.20X/x1-41[»]
4V62X-ray2.90AX/BX2-41[»]
4V82X-ray3.20AX/BX1-41[»]
5E7CX-ray4.50X/x2-40[»]
5KAFX-ray3.00X/x1-41[»]
5KAIX-ray2.80X/x1-41[»]
5TISX-ray2.25X/x1-41[»]
ProteinModelPortaliQ9F1R6.
SMRiQ9F1R6.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

DIPiDIP-48503N.
STRINGi197221.tsr2013.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiBAC09565; BAC09565; BAC09565.
GeneIDi1011760.
KEGGitel:tsr2013.
PATRICi23929440. VBITheElo119873_2106.

Phylogenomic databases

KOiK02722.
OrthoDBiPOG091H15OC.

Miscellaneous databases

EvolutionaryTraceiQ9F1R6.

Family and domain databases

HAMAPiMF_01386. PSII_PsbX_1. 1 hit.
InterProiView protein in InterPro
IPR009518. PSII_PsbX.
IPR023431. PSII_PsbX_type_1_subfam.
PfamiView protein in Pfam
PF06596. PsbX. 1 hit.
ProtoNetiSearch...

Entry informationi

Entry nameiPSBX_THEEB
AccessioniPrimary (citable) accession number: Q9F1R6
Secondary accession number(s): Q8DHE6
Entry historyiIntegrated into UniProtKB/Swiss-Prot: July 22, 2008
Last sequence update: July 22, 2008
Last modified: March 15, 2017
This is version 72 of the entry and version 2 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.