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Protein

Photosystem II 12 kDa extrinsic protein, chloroplastic

Gene

psbU

Organism
Cyanidium caldarium (Red alga)
Status
Reviewed-Annotation score: Annotation score: 4 out of 5-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 (By similarity). Does not bind by itself to PSII; it requires all other members of the OEC.By similarity

GO - Biological processi

Keywordsi

Biological processElectron transport, Photosynthesis, Transport

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem II 12 kDa extrinsic protein, chloroplastic1 Publication
Alternative name(s):
PS II complex 12 kDa extrinsic protein1 Publication
PSII-U
Gene namesi
Name:psbU1 Publication
OrganismiCyanidium caldarium (Red alga)
Taxonomic identifieri2771 [NCBI]
Taxonomic lineageiEukaryotaRhodophytaBangiophyceaeCyanidialesCyanidiaceaeCyanidium

Subcellular locationi

GO - Cellular componenti

Keywords - Cellular componenti

Chloroplast, Membrane, Photosystem II, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transit peptidei1 – 36ChloroplastSequence analysisAdd BLAST36
Transit peptidei37 – 61Thylakoid1 PublicationAdd BLAST25
ChainiPRO_000002960962 – 154Photosystem II 12 kDa extrinsic protein, chloroplasticAdd BLAST93

Post-translational modificationi

Predicted to be translocated into the thylakoid lumen by the Tat system. The position of the first transit peptide cleavage has not been experimentally proven.Curated

Interactioni

Subunit structurei

The oxygen-evolving complex in red algae is composed of PsbO (OEC33), PsbQ', cytochrome c-550 and PsbU.1 Publication

Structurei

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
4YUUX-ray2.77U1/U2/u1/u21-154[»]
ProteinModelPortaliQ9ZQS5.
SMRiQ9ZQS5.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the PsbU family.Curated

Keywords - Domaini

Transit peptide

Family and domain databases

InterProiView protein in InterPro
IPR010527. PSII_PsbU.
IPR006311. TAT_signal.
PfamiView protein in Pfam
PF06514. PsbU. 1 hit.
PROSITEiView protein in PROSITE
PS51318. TAT. 1 hit.

Sequencei

Sequence statusi: Complete.

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

Q9ZQS5-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MAFISTPLGK VTVKSATVSA NRRGLRMQSD SEPVVSRRAL LSGALAAAVA
60 70 80 90 100
AALARARPAQ ARIDYEGIGY LGGGDKIDVN NANVRAYRKF PGLYPTAAKK
110 120 130 140 150
IVQGGPYGTP DDILKNPELS ERDKEVIKKY MDRFVALPPT PEYFTDRVNN

GIYK
Length:154
Mass (Da):16,715
Last modified:June 1, 2001 - v2
Checksum:iEF28D01ABEC0977F
GO

Sequence cautioni

The sequence BAA75398 differs from that shown. Reason: Erroneous initiation.Curated

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sequence conflicti80N → D AA sequence (PubMed:8534673).Curated1
Sequence conflicti90F → I AA sequence (PubMed:8534673).Curated1

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AB023805 mRNA. Translation: BAA75398.1. Different initiation.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AB023805 mRNA. Translation: BAA75398.1. Different initiation.

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
4YUUX-ray2.77U1/U2/u1/u21-154[»]
ProteinModelPortaliQ9ZQS5.
SMRiQ9ZQS5.
ModBaseiSearch...
MobiDBiSearch...

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Family and domain databases

InterProiView protein in InterPro
IPR010527. PSII_PsbU.
IPR006311. TAT_signal.
PfamiView protein in Pfam
PF06514. PsbU. 1 hit.
PROSITEiView protein in PROSITE
PS51318. TAT. 1 hit.
ProtoNetiSearch...

Entry informationi

Entry nameiPSBU_CYACA
AccessioniPrimary (citable) accession number: Q9ZQS5
Secondary accession number(s): Q9T2H0
Entry historyiIntegrated into UniProtKB/Swiss-Prot: June 1, 2001
Last sequence update: June 1, 2001
Last modified: March 15, 2017
This is version 65 of the entry and version 2 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)

Miscellaneousi

Keywords - Technical termi

3D-structure, Direct protein sequencing

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.