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Protein

Photosystem II protein D1 1

Gene

psbA1

more
Organism
Synechococcus sp. (strain CC9605)
Status
Reviewed-Annotation score: -Protein inferred from homologyi

Functioni

Photosystem II (PSII) is a light-driven water: plastoquinone oxidoreductase that uses light energy to abstract electrons from H2O, generating O2 and a proton gradient subsequently used for ATP formation. It consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation. The D1/D2 (PsbA/PsbA) reaction center heterodimer binds P680, the primary electron donor of PSII as well as several subsequent electron acceptors.UniRule annotation

Miscellaneous

Cyanobacteria usually contain more than 2 copies of the psbA gene.UniRule annotation
2 of the reaction center chlorophylls (ChlD1 and ChlD2) are entirely coordinated by water.UniRule annotation
Herbicides such as atrazine, BNT, diuron or ioxynil bind in the Q(B) binding site and block subsequent electron transfer.UniRule annotation

Catalytic activityi

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

Cofactori

Note: The D1/D2 heterodimer binds P680, chlorophylls that are the primary electron donor of PSII, and subsequent electron acceptors. It shares a non-heme iron and each subunit binds pheophytin, quinone, additional chlorophylls, carotenoids and lipids. D1 provides most of the ligands for the Mn4-Ca-O5 cluster of the oxygen-evolving complex (OEC). There is also a Cl(-1) ion associated with D1 and D2, which is required for oxygen evolution. The PSII complex binds additional chlorophylls, carotenoids and specific lipids.UniRule annotation

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Metal bindingi118Magnesium (chlorophyll-a ChlzD1 axial ligand); via tele nitrogenUniRule annotation1
Binding sitei126Pheophytin D1UniRule annotation1
Sitei161Tyrosine radical intermediateUniRule annotation1
Metal bindingi170Calcium-manganese-oxide [Ca-4Mn-5O]; calciumUniRule annotation1
Metal bindingi170Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 4UniRule annotation1
Metal bindingi189Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 1UniRule annotation1
Sitei190Stabilizes free radical intermediateUniRule annotation1
Metal bindingi198Magnesium (chlorophyll-a PD1 axial ligand); via tele nitrogenUniRule annotation1
Metal bindingi215Iron; shared with heterodimeric partner; via tele nitrogenUniRule annotation1
Binding sitei215Quinone (B)UniRule annotation1
Metal bindingi272Iron; shared with heterodimeric partner; via tele nitrogenUniRule annotation1
Metal bindingi332Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 1; via tele nitrogenUniRule annotation1
Metal bindingi333Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 3UniRule annotation1
Metal bindingi333Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 4UniRule annotation1
Metal bindingi342Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 1UniRule annotation1
Metal bindingi342Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 2UniRule annotation1
Metal bindingi344Calcium-manganese-oxide [Ca-4Mn-5O]; calcium; via carboxylateUniRule annotation1
Metal bindingi344Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 2; via carboxylateUniRule annotation1

GO - Molecular functioni

GO - Biological processi

Keywordsi

Molecular functionOxidoreductase
Biological processElectron transport, Herbicide resistance, Photosynthesis, Transport
LigandCalcium, Chlorophyll, Chromophore, Iron, Magnesium, Manganese, Metal-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem II protein D1 1UniRule annotation (EC:1.10.3.9UniRule annotation)
Short name:
PSII D1 protein 1UniRule annotation
Alternative name(s):
Photosystem II Q(B) protein 1UniRule annotation
Gene namesi
Name:psbA1UniRule annotationCurated
Ordered Locus Names:Syncc9605_0307
AND
Name:psbA2UniRule annotationCurated
Ordered Locus Names:Syncc9605_0519
OrganismiSynechococcus sp. (strain CC9605)
Taxonomic identifieri110662 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaSynechococcalesSynechococcaceaeSynechococcus
Proteomesi
  • UP000002711 Componenti: Chromosome

Subcellular locationi

  • Cellular thylakoid membrane UniRule annotation; Multi-pass membrane protein UniRule annotation

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transmembranei29 – 46HelicalUniRule annotationAdd BLAST18
Transmembranei118 – 133HelicalUniRule annotationAdd BLAST16
Transmembranei142 – 156HelicalUniRule annotationAdd BLAST15
Transmembranei197 – 218HelicalUniRule annotationAdd BLAST22
Transmembranei274 – 288HelicalUniRule annotationAdd BLAST15

GO - Cellular componenti

Keywords - Cellular componenti

Membrane, Photosystem II, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00003163921 – 344Photosystem II protein D1 1UniRule annotationAdd BLAST344
PropeptideiPRO_0000316393345 – 359UniRule annotationAdd BLAST15

Post-translational modificationi

Tyr-161 forms a radical intermediate that is referred to as redox-active TyrZ, YZ or Y-Z.UniRule annotation
C-terminally processed by CtpA; processing is essential to allow assembly of the oxygen-evolving complex and thus photosynthetic growth.UniRule annotation

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sitei344 – 345Cleavage; by CtpAUniRule annotation2

Interactioni

Subunit structurei

Cyanobacterial PSII is composed of 1 copy each of membrane proteins PsbA, PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK, PsbL, PsbM, PsbT, PsbX, PsbY, PsbZ, Ycf12, at least 3 peripheral proteins PsbO, PsbU, PsbV and a large number of cofactors. It forms dimeric complexes.UniRule annotation

Protein-protein interaction databases

STRINGi110662.Syncc9605_0519

Structurei

3D structure databases

ProteinModelPortaliQ3AM89
SMRiQ3AM89
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Regioni264 – 265Quinone (B)UniRule annotation2

Sequence similaritiesi

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

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

eggNOGiENOG4105EY5 Bacteria
ENOG410XPX5 LUCA
HOGENOMiHOG000246913
KOiK02703
OMAiRSGANGW
OrthoDBiPOG091H15P4

Family and domain databases

Gene3Di1.20.85.10, 1 hit
HAMAPiMF_01379 PSII_PsbA_D1, 1 hit
InterProiView protein in InterPro
IPR036854 Photo_II_D1/D2_sf
IPR000484 Photo_RC_L/M
IPR005867 PSII_D1
PANTHERiPTHR33149 PTHR33149, 1 hit
PfamiView protein in Pfam
PF00124 Photo_RC, 1 hit
PRINTSiPR00256 REACTNCENTRE
SUPFAMiSSF81483 SSF81483, 1 hit
TIGRFAMsiTIGR01151 psbA, 1 hit
PROSITEiView protein in PROSITE
PS00244 REACTION_CENTER, 1 hit

Sequencei

Sequence statusi: Complete.

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

Q3AM89-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MTTTLQQRSG ASSWQAFCEW VTSTNNRLYV GWFGVLMIPT LLAATICFVI
60 70 80 90 100
AFVAAPPVDI DGIREPVAGS LIYGNNIISG AVVPSSNAIG LHFYPIWEAA
110 120 130 140 150
SLDEWLYNGG PFQLVVFHFL IGIYAYMGRE WELSYRLGMR PWICVAYSAP
160 170 180 190 200
VAAASAVFLV YPFGQGSFSD AMPLGISGTF NYMLVFQAEH NILMHPFHML
210 220 230 240 250
GVAGVFGGSL FSAMHGSLVT SSLVRETTES ESQNYGYKFG QEEETYNIVA
260 270 280 290 300
AHGYFGRLIF QYASFNNSRS LHFFLAAWPV VGIWFTALGV STMAFNLNGF
310 320 330 340 350
NFNQSILDGQ GRVLNTWADV LNRAGLGMEV MHERNAHNFP LDLAAAESTP

VALQAPAIG
Length:359
Mass (Da):39,345
Last modified:November 22, 2005 - v1
Checksum:i51ED5CFA82DCA975
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CP000110 Genomic DNA Translation: ABB34083.1
CP000110 Genomic DNA Translation: ABB34293.1
RefSeqiWP_006850357.1, NC_007516.1

Genome annotation databases

EnsemblBacteriaiABB34083; ABB34083; Syncc9605_0307
ABB34293; ABB34293; Syncc9605_0519
KEGGisyd:Syncc9605_0307
syd:Syncc9605_0519

Similar proteinsi

Entry informationi

Entry nameiPSBA1_SYNSC
AccessioniPrimary (citable) accession number: Q3AM89
Entry historyiIntegrated into UniProtKB/Swiss-Prot: February 5, 2008
Last sequence update: November 22, 2005
Last modified: April 25, 2018
This is version 90 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

Complete proteome, Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families

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