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Protein

Photosystem II protein D1

Gene

psbA1

more
Organism
Prochlorococcus marinus (strain NATL2A)
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 bindingi119Magnesium (chlorophyll-a ChlzD1 axial ligand); via tele nitrogenUniRule annotation1
Binding sitei127Pheophytin D1UniRule annotation1
Sitei162Tyrosine radical intermediateUniRule annotation1
Metal bindingi171Calcium-manganese-oxide [Ca-4Mn-5O]; calciumUniRule annotation1
Metal bindingi171Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 4UniRule annotation1
Metal bindingi190Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 1UniRule annotation1
Sitei191Stabilizes free radical intermediateUniRule annotation1
Metal bindingi199Magnesium (chlorophyll-a PD1 axial ligand); via tele nitrogenUniRule annotation1
Metal bindingi216Iron; shared with heterodimeric partner; via tele nitrogenUniRule annotation1
Binding sitei216Quinone (B)UniRule annotation1
Metal bindingi273Iron; shared with heterodimeric partner; via tele nitrogenUniRule annotation1
Metal bindingi333Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 1; via tele nitrogenUniRule annotation1
Metal bindingi334Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 3UniRule annotation1
Metal bindingi334Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 4UniRule annotation1
Metal bindingi343Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 1UniRule annotation1
Metal bindingi343Calcium-manganese-oxide [Ca-4Mn-5O]; manganese 2UniRule annotation1
Metal bindingi345Calcium-manganese-oxide [Ca-4Mn-5O]; calcium; via carboxylateUniRule annotation1
Metal bindingi345Calcium-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 D1UniRule annotation (EC:1.10.3.9UniRule annotation)
Short name:
PSII D1 proteinUniRule annotation
Alternative name(s):
Photosystem II Q(B) proteinUniRule annotation
Gene namesi
Name:psbA1UniRule annotationCurated
Ordered Locus Names:PMN2A_0558
AND
Name:psbA2UniRule annotationCurated
Ordered Locus Names:PMN2A_0735
AND
Name:psbA3UniRule annotationCurated
Ordered Locus Names:PMN2A_1592
OrganismiProchlorococcus marinus (strain NATL2A)
Taxonomic identifieri59920 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaSynechococcalesProchloraceaeProchlorococcus
Proteomesi
  • UP000002535 Componenti: Chromosome

Subcellular locationi

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

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transmembranei30 – 47HelicalUniRule annotationAdd BLAST18
Transmembranei119 – 134HelicalUniRule annotationAdd BLAST16
Transmembranei143 – 157HelicalUniRule annotationAdd BLAST15
Transmembranei198 – 219HelicalUniRule annotationAdd BLAST22
Transmembranei275 – 289HelicalUniRule annotationAdd BLAST15

GO - Cellular componenti

Keywords - Cellular componenti

Membrane, Photosystem II, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00003163691 – 345Photosystem II protein D1UniRule annotationAdd BLAST345
PropeptideiPRO_0000316370346 – 360UniRule annotationAdd BLAST15

Post-translational modificationi

Tyr-162 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
Sitei345 – 346Cleavage; 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

Structurei

3D structure databases

ProteinModelPortaliQ46JV2
SMRiQ46JV2
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Regioni265 – 266Quinone (B)UniRule annotation2

Sequence similaritiesi

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

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

HOGENOMiHOG000246913
KOiK02703
OMAiGIWFTSM
OrthoDBiPOG091H15P4
PhylomeDBiQ46JV2

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.

Q46JV2-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MTTIQQQRSS LLKGWPQFCE WVTSTNNRIY VGWFGVLMIP CLLAATTCFI
60 70 80 90 100
VAFIAAPPVD IDGIREPVAG SFMYGNNIIS GAVVPSSNAI GLHFYPIWEA
110 120 130 140 150
ATLDEWLYNG GPYQLVIFHF LIGISAYMGR QWELSYRLGM RPWICVAYSA
160 170 180 190 200
PVSAAFAVFL VYPFGQGSFS DGMPLGISGT FNFMFVFQAE HNILMHPFHM
210 220 230 240 250
AGVAGMFGGA LFSAMHGSLV TSSLIRETTG LDSQNYGYKF GQEEETYNIV
260 270 280 290 300
AAHGYFGRLI FQYASFNNSR SLHFFLASWP VICVWLTSMG ICTMAFNLNG
310 320 330 340 350
FNFNQSVVDT SGKVVPTWGD VLNRANLGME VMHERNAHNF PLDLAAAEST
360
SVALVAPAIG
Length:360
Mass (Da):39,638
Last modified:September 13, 2005 - v1
Checksum:i536BE7C71DF4D18E
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CP000095 Genomic DNA Translation: AAZ58049.1
CP000095 Genomic DNA Translation: AAZ58226.1
CP000095 Genomic DNA Translation: AAZ59080.1
RefSeqiWP_011294225.1, NC_007335.2

Genome annotation databases

EnsemblBacteriaiAAZ58049; AAZ58049; PMN2A_0558
AAZ58226; AAZ58226; PMN2A_0735
AAZ59080; AAZ59080; PMN2A_1592
KEGGipmn:PMN2A_0558
pmn:PMN2A_0735
pmn:PMN2A_1592

Similar proteinsi

Entry informationi

Entry nameiPSBA_PROMT
AccessioniPrimary (citable) accession number: Q46JV2
Entry historyiIntegrated into UniProtKB/Swiss-Prot: February 5, 2008
Last sequence update: September 13, 2005
Last modified: February 28, 2018
This is version 91 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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