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A0T0W2 (PSBA_THAPS) Reviewed, UniProtKB/Swiss-Prot

Last modified February 19, 2014. Version 49. Feed History...

Clusters with 100%, 90%, 50% identity | Documents (1) | Third-party data text xml rdf/xml gff fasta
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Names and origin

Protein namesRecommended name:
Photosystem Q(B) protein

EC=1.10.3.9
Alternative name(s):
32 kDa thylakoid membrane protein
Photosystem II protein D1
Gene names
Name:psbA
Encoded onPlastid; Chloroplast
OrganismThalassiosira pseudonana (Marine diatom) (Cyclotella nana) [Reference proteome]
Taxonomic identifier35128 [NCBI]
Taxonomic lineageEukaryotaStramenopilesBacillariophytaCoscinodiscophyceaeThalassiosirophycidaeThalassiosiralesThalassiosiraceaeThalassiosira

Protein attributes

Sequence length360 AA.
Sequence statusComplete.
Sequence processingThe displayed sequence is further processed into a mature form.
Protein existenceInferred from homology

General annotation (Comments)

Function

This is one of the two reaction center proteins of photosystem II By similarity. HAMAP-Rule MF_01379

Catalytic activity

2 H2O + 2 plastoquinone + 4 light = O2 + 2 plastoquinol. HAMAP-Rule MF_01379

Cofactor

The psbA/B heterodimer binds P680, the primary electron donor of PSII. It shares a non-heme iron and each subunit binds additional chlorophylls and pheophytin. PsbA provides most of the ligands for the Mn-cluster of the oxygen-evolving complex By similarity.

Subunit structure

The psbA/B heterodimer binds the P680 chlorophylls and subsequent electron acceptors. PSII consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation. PSII forms dimeric complexes By similarity.

Subcellular location

Plastidchloroplast thylakoid membrane; Multi-pass membrane protein By similarity HAMAP-Rule MF_01379.

Miscellaneous

Herbicides such as atrazine, BNT, diuron or ioxynil bind to Q(B) and block electron transport By similarity.

Sequence similarities

Belongs to the reaction center PufL/M/PsbA/D family.

Sequence annotation (Features)

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifier

Molecule processing

Chain1 – 344344Photosystem Q(B) protein HAMAP-Rule MF_01379
PRO_0000316521
Propeptide345 – 36016 Potential
PRO_0000316522

Regions

Transmembrane36 – 5621Helical; Potential
Transmembrane109 – 12921Helical; Potential
Transmembrane141 – 16424Helical; Potential
Transmembrane192 – 21827Helical; Potential
Transmembrane269 – 28921Helical; Potential

Sites

Metal binding1701Calcium-manganese-oxide cluster [Ca-4Mn-5O]; calcium By similarity
Metal binding1701Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 1 By similarity
Metal binding1891Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2 By similarity
Metal binding2151Iron; shared with heterodimeric partner By similarity
Metal binding2721Iron; shared with heterodimeric partner By similarity
Metal binding3321Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2; via tele nitrogen By similarity
Metal binding3331Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 1 By similarity
Metal binding3331Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 3 By similarity
Metal binding3421Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2 By similarity
Metal binding3421Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 4 By similarity
Metal binding3441Calcium-manganese-oxide cluster [Ca-4Mn-5O]; calcium; via carboxylate By similarity
Metal binding3441Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 4; via carboxylate By similarity
Site344 – 3452Cleavage; by ctpA By similarity

Sequences

Sequence LengthMass (Da)Tools
A0T0W2 [UniParc].

Last modified January 9, 2007. Version 1.
Checksum: 1274B0B0A53057DD

FASTA36039,699
        10         20         30         40         50         60 
MIATLERREG VSLWERFCAW ITSTENRLYI GWFGCLMFPT LLTATSCFII AFIAAPPVDI 

        70         80         90        100        110        120 
DGIREPVAGS LLYGNNIISG AVIPSSNAIG MHFYPIWEAA SVDEWLYNGG PYQLIVLHFL 

       130        140        150        160        170        180 
LGVASYMGRE WELSYRLGMR PWIFVAFSAP VAAASAVFLV YPIGQGSFSD GMPLGISGTF 

       190        200        210        220        230        240 
NFMLVFQAEH NILMHPFHMA GVAGVFGGSL FSAMHGSLVT SSLIRETTEN ESTNYGYKFG 

       250        260        270        280        290        300 
QEEETYNIVA AHGYFGRLIF QYASFNNSRA LHFFLALWPV LGIWLTAMGI STMAFNLNGF 

       310        320        330        340        350        360 
NFNQSVVDSQ GRVINTWADI INRADLGMEV MHERNAHNFP LDLASGDVLP VAFTAPAVNA 

« Hide

References

[1]"Chloroplast genomes of the diatoms Phaeodactylum tricornutum and Thalassiosira pseudonana: comparison with other plastid genomes of the red lineage."
Oudot-Le Secq M.-P., Grimwood J., Shapiro H., Armbrust E.V., Bowler C., Green B.R.
Mol. Genet. Genomics 277:427-439(2007) [PubMed] [Europe PMC] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
Strain: CCMP1335.

Cross-references

Sequence databases

EMBL
GenBank
DDBJ
EF067921 Genomic DNA. Translation: ABK20797.1.
EF067921 Genomic DNA. Translation: ABK20843.1.
RefSeqYP_874574.1. NC_008589.1.
YP_874620.1. NC_008589.1.

3D structure databases

ProteinModelPortalA0T0W2.
SMRA0T0W2. Positions 12-344.
ModBaseSearch...
MobiDBSearch...

Protocols and materials databases

StructuralBiologyKnowledgebaseSearch...

Genome annotation databases

GeneID4524822.
4524891.

Phylogenomic databases

HOGENOMHOG000246913.
ProtClustDBCHL00003.

Family and domain databases

Gene3D1.20.85.10. 1 hit.
HAMAPMF_01379. PSII_PsbA_D1.
InterProIPR000484. Photo_RC_L/M.
IPR005867. PSII_D1.
[Graphical view]
PfamPF00124. Photo_RC. 1 hit.
[Graphical view]
PRINTSPR00256. REACTNCENTRE.
SUPFAMSSF81483. SSF81483. 1 hit.
TIGRFAMsTIGR01151. psbA. 1 hit.
PROSITEPS00244. REACTION_CENTER. 1 hit.
[Graphical view]
ProtoNetSearch...

Entry information

Entry namePSBA_THAPS
AccessionPrimary (citable) accession number: A0T0W2
Entry history
Integrated into UniProtKB/Swiss-Prot: February 5, 2008
Last sequence update: January 9, 2007
Last modified: February 19, 2014
This is version 49 of the entry and version 1 of the sequence. [Complete history]
Entry statusReviewed (UniProtKB/Swiss-Prot)

Relevant documents

SIMILARITY comments

Index of protein domains and families