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A0T0W2

- PSBA_THAPS

UniProt

A0T0W2 - PSBA_THAPS

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Protein
Photosystem Q(B) protein
Gene
psbA
Organism
Thalassiosira pseudonana (Marine diatom) (Cyclotella nana)
Status
Reviewed - Annotation score: 3 out of 5 - Protein inferred from homologyi

Functioni

This is one of the two reaction center proteins of photosystem II By similarity.UniRule annotation

Catalytic activityi

2 H2O + 2 plastoquinone + 4 light = O2 + 2 plastoquinol.UniRule annotation

Cofactori

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.

Sites

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Metal bindingi170 – 1701Calcium-manganese-oxide cluster [Ca-4Mn-5O]; calcium By similarity
Metal bindingi170 – 1701Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 1 By similarity
Metal bindingi189 – 1891Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2 By similarity
Metal bindingi215 – 2151Iron; shared with heterodimeric partner By similarity
Metal bindingi272 – 2721Iron; shared with heterodimeric partner By similarity
Metal bindingi332 – 3321Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2; via tele nitrogen By similarity
Metal bindingi333 – 3331Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 1 By similarity
Metal bindingi333 – 3331Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 3 By similarity
Metal bindingi342 – 3421Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2 By similarity
Metal bindingi342 – 3421Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 4 By similarity
Sitei344 – 3452Cleavage; by ctpA By similarity
Metal bindingi344 – 3441Calcium-manganese-oxide cluster [Ca-4Mn-5O]; calcium; via carboxylate By similarity
Metal bindingi344 – 3441Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 4; via carboxylate By similarity

GO - Molecular functioni

  1. electron transporter, transferring electrons within the cyclic electron transport pathway of photosynthesis activity Source: InterPro
  2. iron ion binding Source: UniProtKB-HAMAP
  3. oxidoreductase activity Source: UniProtKB-KW
Complete GO annotation...

GO - Biological processi

  1. photosynthetic electron transport in photosystem II Source: InterPro
  2. response to herbicide Source: UniProtKB-KW
Complete GO annotation...

Keywords - Molecular functioni

Oxidoreductase

Keywords - Biological processi

Electron transport, Herbicide resistance, Photosynthesis, Transport

Keywords - Ligandi

Calcium, Iron, Manganese, Metal-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem Q(B) protein (EC:1.10.3.9)
Alternative name(s):
32 kDa thylakoid membrane protein
Photosystem II protein D1
Gene namesi
Name:psbA
Encoded oniPlastid; Chloroplast
OrganismiThalassiosira pseudonana (Marine diatom) (Cyclotella nana)
Taxonomic identifieri35128 [NCBI]
Taxonomic lineageiEukaryotaStramenopilesBacillariophytaCoscinodiscophyceaeThalassiosirophycidaeThalassiosiralesThalassiosiraceaeThalassiosira
ProteomesiUP000001449: Chloroplast

Subcellular locationi

Topology

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Transmembranei36 – 5621Helical; Reviewed prediction
Add
BLAST
Transmembranei109 – 12921Helical; Reviewed prediction
Add
BLAST
Transmembranei141 – 16424Helical; Reviewed prediction
Add
BLAST
Transmembranei192 – 21827Helical; Reviewed prediction
Add
BLAST
Transmembranei269 – 28921Helical; Reviewed prediction
Add
BLAST

GO - Cellular componenti

  1. chloroplast thylakoid membrane Source: UniProtKB-SubCell
  2. integral component of membrane Source: UniProtKB-KW
  3. photosystem II Source: UniProtKB-KW
Complete GO annotation...

Keywords - Cellular componenti

Chloroplast, Membrane, Photosystem II, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini1 – 344344Photosystem Q(B) proteinUniRule annotation
PRO_0000316521Add
BLAST
Propeptidei345 – 36016 Reviewed prediction
PRO_0000316522Add
BLAST

Interactioni

Subunit structurei

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.

Structurei

3D structure databases

ProteinModelPortaliA0T0W2.
SMRiA0T0W2. Positions 12-344.

Family & Domainsi

Sequence similaritiesi

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

HOGENOMiHOG000246913.

Family and domain databases

Gene3Di1.20.85.10. 1 hit.
HAMAPiMF_01379. PSII_PsbA_D1.
InterProiIPR000484. Photo_RC_L/M.
IPR005867. PSII_D1.
[Graphical view]
PfamiPF00124. Photo_RC. 1 hit.
[Graphical view]
PRINTSiPR00256. REACTNCENTRE.
SUPFAMiSSF81483. SSF81483. 1 hit.
TIGRFAMsiTIGR01151. psbA. 1 hit.
PROSITEiPS00244. REACTION_CENTER. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

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

A0T0W2-1 [UniParc]FASTAAdd to Basket

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MIATLERREG VSLWERFCAW ITSTENRLYI GWFGCLMFPT LLTATSCFII    50
AFIAAPPVDI DGIREPVAGS LLYGNNIISG AVIPSSNAIG MHFYPIWEAA 100
SVDEWLYNGG PYQLIVLHFL LGVASYMGRE WELSYRLGMR PWIFVAFSAP 150
VAAASAVFLV YPIGQGSFSD GMPLGISGTF NFMLVFQAEH NILMHPFHMA 200
GVAGVFGGSL FSAMHGSLVT SSLIRETTEN ESTNYGYKFG QEEETYNIVA 250
AHGYFGRLIF QYASFNNSRA LHFFLALWPV LGIWLTAMGI STMAFNLNGF 300
NFNQSVVDSQ GRVINTWADI INRADLGMEV MHERNAHNFP LDLASGDVLP 350
VAFTAPAVNA 360
Length:360
Mass (Da):39,699
Last modified:January 9, 2007 - v1
Checksum:i1274B0B0A53057DD
GO

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
EF067921 Genomic DNA. Translation: ABK20797.1.
EF067921 Genomic DNA. Translation: ABK20843.1.
RefSeqiYP_874574.1. NC_008589.1.
YP_874620.1. NC_008589.1.

Genome annotation databases

GeneIDi4524822.
4524891.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
EF067921 Genomic DNA. Translation: ABK20797.1 .
EF067921 Genomic DNA. Translation: ABK20843.1 .
RefSeqi YP_874574.1. NC_008589.1.
YP_874620.1. NC_008589.1.

3D structure databases

ProteinModelPortali A0T0W2.
SMRi A0T0W2. Positions 12-344.
ModBasei Search...

Protocols and materials databases

Structural Biology Knowledgebase Search...

Genome annotation databases

GeneIDi 4524822.
4524891.

Phylogenomic databases

HOGENOMi HOG000246913.

Family and domain databases

Gene3Di 1.20.85.10. 1 hit.
HAMAPi MF_01379. PSII_PsbA_D1.
InterProi IPR000484. Photo_RC_L/M.
IPR005867. PSII_D1.
[Graphical view ]
Pfami PF00124. Photo_RC. 1 hit.
[Graphical view ]
PRINTSi PR00256. REACTNCENTRE.
SUPFAMi SSF81483. SSF81483. 1 hit.
TIGRFAMsi TIGR01151. psbA. 1 hit.
PROSITEi PS00244. REACTION_CENTER. 1 hit.
[Graphical view ]
ProtoNeti Search...

Publicationsi

  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.

Entry informationi

Entry nameiPSBA_THAPS
AccessioniPrimary (citable) accession number: A0T0W2
Entry historyi
Integrated into UniProtKB/Swiss-Prot: February 5, 2008
Last sequence update: January 9, 2007
Last modified: May 14, 2014
This is version 50 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)

Miscellaneousi

Miscellaneous

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

Keywords - Technical termi

Complete proteome, Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families

External Data

Dasty 3

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