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A2BUK1

- PSBA_PROM5

UniProt

A2BUK1 - PSBA_PROM5

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Protein

Photosystem Q(B) protein

Gene
psbA1, P9515_02531
psbA2, P9515_02551
Organism
Prochlorococcus marinus (strain MIT 9515)
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 bindingi171 – 1711Calcium-manganese-oxide cluster [Ca-4Mn-5O]; calcium By similarity
Metal bindingi171 – 1711Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 1 By similarity
Metal bindingi190 – 1901Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2 By similarity
Metal bindingi216 – 2161Iron; shared with heterodimeric partner By similarity
Metal bindingi273 – 2731Iron; shared with heterodimeric partner By similarity
Metal bindingi333 – 3331Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2; via tele nitrogen By similarity
Metal bindingi334 – 3341Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 1 By similarity
Metal bindingi334 – 3341Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 3 By similarity
Metal bindingi343 – 3431Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 2 By similarity
Metal bindingi343 – 3431Calcium-manganese-oxide cluster [Ca-4Mn-5O]; manganese 4 By similarity
Sitei345 – 3462Cleavage; by CtpA By similarity
Metal bindingi345 – 3451Calcium-manganese-oxide cluster [Ca-4Mn-5O]; calcium; via carboxylate By similarity
Metal bindingi345 – 3451Calcium-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

BioCyciPMAR167542:GI3N-256-MONOMER.
PMAR167542:GI3N-258-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:P9515_02531
AND
Name:psbA2
Ordered Locus Names:P9515_02551
OrganismiProchlorococcus marinus (strain MIT 9515)
Taxonomic identifieri167542 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaProchloralesProchlorococcaceaeProchlorococcus
ProteomesiUP000001589: Chromosome

Subcellular locationi

Topology

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Transmembranei37 – 5721Helical; Reviewed predictionAdd
BLAST
Transmembranei110 – 13021Helical; Reviewed predictionAdd
BLAST
Transmembranei142 – 16524Helical; Reviewed predictionAdd
BLAST
Transmembranei193 – 21927Helical; Reviewed predictionAdd
BLAST
Transmembranei270 – 29021Helical; Reviewed predictionAdd
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 – 345345Photosystem Q(B) proteinUniRule annotationPRO_0000316365Add
BLAST
Propeptidei346 – 36015 Reviewed predictionPRO_0000316366Add
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

STRINGi167542.P9515_02551.

Structurei

3D structure databases

ProteinModelPortaliA2BUK1.
SMRiA2BUK1. Positions 15-345.

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.

A2BUK1-1 [UniParc]FASTAAdd to Basket

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MTTIQQQRTS LLKGWPQFCE WVTSTNNRIY VGWFGVLMIP CLLAAAACFI    50
VAFIAAPPVD IDGIREPVAG SFLYGNNIIS GAVVPSSNAI GLHFYPIWEA 100
ATVDEWLYNG GPYQLVIFHF LIGISAYMGR QWELSYRLGM RPWICVAYSA 150
PVSAAFAVFL VYPFGQGSFS DGMPLGISGT FNFMFVFQAE HNILMHPFHM 200
AGVAGMFGGS LFSAMHGSLV TSSLIRETTE TESQNYGYKF GQEEETYNIV 250
AAHGYFGRLI FQYASFNNSR SLHFFLAVFP VVCVWLTSMG ICTMAFNLNG 300
FNFNQSVVDA NGKIVPTWGD VLNRANLGME VMHERNAHNF PLDLAAAEST 350
TVALTAPAIG 360
Length:360
Mass (Da):39,636
Last modified:February 20, 2007 - v1
Checksum:i1F753283412DF22A
GO

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
CP000552 Genomic DNA. Translation: ABM71462.1.
CP000552 Genomic DNA. Translation: ABM71464.1.
RefSeqiYP_001010569.1. NC_008817.1.
YP_001010571.1. NC_008817.1.

Genome annotation databases

EnsemblBacteriaiABM71462; ABM71462; P9515_02531.
ABM71464; ABM71464; P9515_02551.
GeneIDi4720389.
4720391.
KEGGipmc:P9515_02531.
pmc:P9515_02551.
PATRICi23014026. VBIProMar113831_0256.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
CP000552 Genomic DNA. Translation: ABM71462.1 .
CP000552 Genomic DNA. Translation: ABM71464.1 .
RefSeqi YP_001010569.1. NC_008817.1.
YP_001010571.1. NC_008817.1.

3D structure databases

ProteinModelPortali A2BUK1.
SMRi A2BUK1. Positions 15-345.
ModBasei Search...
MobiDBi Search...

Protein-protein interaction databases

STRINGi 167542.P9515_02551.

Protocols and materials databases

Structural Biology Knowledgebase Search...

Genome annotation databases

EnsemblBacteriai ABM71462 ; ABM71462 ; P9515_02531 .
ABM71464 ; ABM71464 ; P9515_02551 .
GeneIDi 4720389.
4720391.
KEGGi pmc:P9515_02531.
pmc:P9515_02551.
PATRICi 23014026. VBIProMar113831_0256.

Phylogenomic databases

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

Enzyme and pathway databases

BioCyci PMAR167542:GI3N-256-MONOMER.
PMAR167542:GI3N-258-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 9515.

Entry informationi

Entry nameiPSBA_PROM5
AccessioniPrimary (citable) accession number: A2BUK1
Entry historyi
Integrated into UniProtKB/Swiss-Prot: February 5, 2008
Last sequence update: February 20, 2007
Last modified: May 14, 2014
This is version 58 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