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A2C6Q1

- PSBA_PROM3

UniProt

A2C6Q1 - PSBA_PROM3

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Protein
Photosystem Q(B) protein
Gene
psbA1, P9303_04091
psbA2, P9303_18681
Organism
Prochlorococcus marinus (strain MIT 9303)
Status
Reviewed - Annotation score: 4 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 bindingi169 – 1691Calcium-manganese-oxide cluster [Ca-4Mn-5O]; calcium By similarity
Metal bindingi169 – 1691Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 1 By similarity
Metal bindingi188 – 1881Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2 By similarity
Metal bindingi214 – 2141Iron; shared with heterodimeric partner By similarity
Metal bindingi271 – 2711Iron; shared with heterodimeric partner By similarity
Metal bindingi331 – 3311Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2; via tele nitrogen By similarity
Metal bindingi332 – 3321Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 1 By similarity
Metal bindingi332 – 3321Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 3 By similarity
Metal bindingi341 – 3411Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2 By similarity
Metal bindingi341 – 3411Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 4 By similarity
Sitei343 – 3442Cleavage; by CtpA By similarity
Metal bindingi343 – 3431Calcium-manganese-oxide cluster [Ca-4Mn-5O]; calcium; via carboxylate By similarity
Metal bindingi343 – 3431Calcium-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

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

Enzyme and pathway databases

BioCyciPMAR59922:GH54-1968-MONOMER.
PMAR59922:GH54-467-MONOMER.

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:psbA1
Ordered Locus Names:P9303_04091
AND
Name:psbA2
Ordered Locus Names:P9303_18681
OrganismiProchlorococcus marinus (strain MIT 9303)
Taxonomic identifieri59922 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaProchloralesProchlorococcaceaeProchlorococcus
ProteomesiUP000002274: Chromosome

Subcellular locationi

Topology

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Transmembranei35 – 5521Helical; Reviewed prediction
Add
BLAST
Transmembranei108 – 12821Helical; Reviewed prediction
Add
BLAST
Transmembranei140 – 16324Helical; Reviewed prediction
Add
BLAST
Transmembranei191 – 21727Helical; Reviewed prediction
Add
BLAST
Transmembranei268 – 28821Helical; Reviewed prediction
Add
BLAST

GO - Cellular componenti

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

Keywords - Cellular componenti

Membrane, Photosystem II, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini1 – 343343Photosystem Q(B) proteinUniRule annotation
PRO_0000316359Add
BLAST
Propeptidei344 – 35815 Reviewed prediction
PRO_0000316360Add
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.

Protein-protein interaction databases

STRINGi59922.P9303_18681.

Structurei

3D structure databases

ProteinModelPortaliA2C6Q1.
SMRiA2C6Q1. Positions 13-343.

Family & Domainsi

Sequence similaritiesi

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

eggNOGiNOG04871.
HOGENOMiHOG000246913.
KOiK02703.
OMAiCFTIAFI.
OrthoDBiEOG6Q2SGP.

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.

A2C6Q1-1 [UniParc]FASTAAdd to Basket

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MTTTIRSGRL SSWESFCNWV TSTNNRIYVG WFGVLMVPTL LAAAICFTIA    50
FIAAPPVDID GIREPVAGSF LYGNNIISGA VVPSSNAIGL HFYPIWEAAS 100
VDEWLYNGGP YQLVVFHFLI GICCWLGRQW ELSYRLGMRP WICVAYSAPL 150
SAAFAVFLIY PVGQGSFSDG MPLGISGTFN FMLVFQAEHN ILMHPFHMIG 200
VAGMFGGSLF SAMHGSLVTS SLIRETTETE SQNYGYKFGQ EEETYNIVAA 250
HGYFGRLIFQ YASFNNSRSL HFFLAAWPVI CIWITSLGIS TMAFNLNGFN 300
FNQSVLDAQG RVVPTWADVL NRSNLGMEVM HERNAHNFPL DLAAAESTPV 350
ALIAPAIG 358
Length:358
Mass (Da):39,442
Last modified:February 20, 2007 - v1
Checksum:iDADC843F3EE9EBE4
GO

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
CP000554 Genomic DNA. Translation: ABM77161.1.
CP000554 Genomic DNA. Translation: ABM78610.1.
RefSeqiWP_011825086.1. NC_008820.1.
YP_001016426.1. NC_008820.1.
YP_001017875.1. NC_008820.1.

Genome annotation databases

EnsemblBacteriaiABM77161; ABM77161; P9303_04091.
ABM78610; ABM78610; P9303_18681.
GeneIDi4777504.
4777705.
KEGGipmf:P9303_04091.
pmf:P9303_18681.
PATRICi22998231. VBIProMar17757_0440.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
CP000554 Genomic DNA. Translation: ABM77161.1 .
CP000554 Genomic DNA. Translation: ABM78610.1 .
RefSeqi WP_011825086.1. NC_008820.1.
YP_001016426.1. NC_008820.1.
YP_001017875.1. NC_008820.1.

3D structure databases

ProteinModelPortali A2C6Q1.
SMRi A2C6Q1. Positions 13-343.
ModBasei Search...
MobiDBi Search...

Protein-protein interaction databases

STRINGi 59922.P9303_18681.

Protocols and materials databases

Structural Biology Knowledgebase Search...

Genome annotation databases

EnsemblBacteriai ABM77161 ; ABM77161 ; P9303_04091 .
ABM78610 ; ABM78610 ; P9303_18681 .
GeneIDi 4777504.
4777705.
KEGGi pmf:P9303_04091.
pmf:P9303_18681.
PATRICi 22998231. VBIProMar17757_0440.

Phylogenomic databases

eggNOGi NOG04871.
HOGENOMi HOG000246913.
KOi K02703.
OMAi CFTIAFI.
OrthoDBi EOG6Q2SGP.

Enzyme and pathway databases

BioCyci PMAR59922:GH54-1968-MONOMER.
PMAR59922:GH54-467-MONOMER.

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. Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
    Strain: MIT 9303.

Entry informationi

Entry nameiPSBA_PROM3
AccessioniPrimary (citable) accession number: A2C6Q1
Entry historyi
Integrated into UniProtKB/Swiss-Prot: February 5, 2008
Last sequence update: February 20, 2007
Last modified: September 3, 2014
This is version 60 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Miscellaneous

Herbicides such as atrazine, BNT, diuron or ioxynil bind to Q(B) and block electron transport By similarity.
Cyanobacteria usually contain more than 2 copies of the psbA gene.

Keywords - Technical termi

Complete proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families

External Data

Dasty 3

Similar proteinsi