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Protein

Photosystem II D2 protein

Gene

psbD

Organism
Euglena gracilis
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. D2 is needed for assembly of a stable PSII complex.UniRule annotation

Miscellaneous

2 of the reaction center chlorophylls (ChlD1 and ChlD2) are entirely coordinated by water.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. 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 bindingi117Magnesium (chlorophyll-a ChlzD2, axial ligand; peripheral); via tele nitrogenUniRule annotation1
Binding sitei129Pheophytin D2UniRule annotation1
Binding sitei142Pheophytin D2UniRule annotation1
Metal bindingi197Magnesium (chlorophyll-a PD2 axial ligand); via tele nitrogenUniRule annotation1
Metal bindingi214Iron; shared with heterodimeric partner; via tele nitrogenUniRule annotation1
Binding sitei214Plastoquinone Q(A)UniRule annotation1
Binding sitei261Plastoquinone Q(A); via amide nitrogenUniRule annotation1
Metal bindingi268Iron; shared with heterodimeric partner; via tele nitrogenUniRule annotation1

GO - Molecular functioni

GO - Biological processi

Keywordsi

Molecular functionOxidoreductase
Biological processElectron transport, Photosynthesis, Transport
LigandChlorophyll, Chromophore, Iron, Magnesium, Metal-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem II D2 proteinUniRule annotation (EC:1.10.3.9UniRule annotation)
Short name:
PSII D2 proteinUniRule annotation
Alternative name(s):
Photosystem Q(A) proteinUniRule annotation
Gene namesi
Name:psbDUniRule annotation
Encoded oniPlastid; Chloroplast
OrganismiEuglena gracilis
Taxonomic identifieri3039 [NCBI]
Taxonomic lineageiEukaryotaEuglenozoaEuglenidaEuglenalesEuglenaceaeEuglena

Subcellular locationi

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

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transmembranei40 – 60HelicalUniRule annotationAdd BLAST21
Transmembranei124 – 140HelicalUniRule annotationAdd BLAST17
Transmembranei152 – 165HelicalUniRule annotationAdd BLAST14
Transmembranei207 – 227HelicalUniRule annotationAdd BLAST21
Transmembranei278 – 294HelicalUniRule annotationAdd BLAST17

GO - Cellular componenti

Keywords - Cellular componenti

Chloroplast, Membrane, Photosystem II, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00000905031 – 352Photosystem II D2 proteinAdd BLAST352

Proteomic databases

PRIDEiP31557

Interactioni

Subunit structurei

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 of the oxygen-evolving complex and a large number of cofactors. It forms dimeric complexes.UniRule annotation

Structurei

3D structure databases

ProteinModelPortaliP31557
SMRiP31557
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

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

Keywords - Domaini

Transmembrane, Transmembrane helix

Family and domain databases

CDDicd09288 Photosystem-II_D2, 1 hit
Gene3Di1.20.85.10, 1 hit
HAMAPiMF_01383 PSII_PsbD_D2, 1 hit
InterProiView protein in InterPro
IPR036854 Photo_II_D1/D2_sf
IPR000484 Photo_RC_L/M
IPR005868 PSII_PsbD/D2
PANTHERiPTHR33149 PTHR33149, 1 hit
PfamiView protein in Pfam
PF00124 Photo_RC, 1 hit
PRINTSiPR00256 REACTNCENTRE
SUPFAMiSSF81483 SSF81483, 1 hit
TIGRFAMsiTIGR01152 psbD, 1 hit
PROSITEiView protein in PROSITE
PS00244 REACTION_CENTER, 1 hit

Sequencei

Sequence statusi: Complete.

P31557-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MTFTDLNTEN KNGWFDVADD WLKKDRFIFI GWSGLLLFPC SYLALGGWLT
60 70 80 90 100
GITFVTSWYT HGLASSFLEG CNALTAAVST PPNSMGHSLL LLLGSEAQWD
110 120 130 140 150
FTRWLQIGGL WPFIALHGAF GLIGFMLRQF EIAKAVQIRP YNAIAFSAPI
160 170 180 190 200
SVFVSVFLIY PLGQSGWFFA PSFGVAAIFR FILFFQGFHN WTLNPFHMMG
210 220 230 240 250
VAGVLGAALL CAIHGATVEN TIFEDGDSPN TFRAFNPLQS EETYSMVTAN
260 270 280 290 300
RFWSQIFGVA FSNKRWLHFF MVFVPVTGLR MSALGIVGLA LNLRAYDFVS
310 320 330 340 350
QEIRAAEDPE FETFYTKNIL LNEGIRAWMA AQDQPHEQFI FPEEVLPRGN

AL
Length:352
Mass (Da):39,474
Last modified:July 1, 1993 - v1
Checksum:i16A9407D49AA2C27
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
Z11874 Genomic DNA No translation available.
X70810 Genomic DNA Translation: CAA50076.1
PIRiS34495
RefSeqiNP_041889.2, NC_001603.2

Genome annotation databases

GeneIDi807490

Similar proteinsi

Entry informationi

Entry nameiPSBD_EUGGR
AccessioniPrimary (citable) accession number: P31557
Entry historyiIntegrated into UniProtKB/Swiss-Prot: July 1, 1993
Last sequence update: July 1, 1993
Last modified: February 28, 2018
This is version 102 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)

Miscellaneousi

Documents

  1. SIMILARITY comments
    Index of protein domains and families

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