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Protein

Photosystem II D2 protein

Gene

psbD

Organism
Cuscuta sandwichiana (Kauna'oa)
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

Caution

This organism being probably non-photosynthetic, the role of this protein is uncertain.Curated

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 bindingi118Magnesium (chlorophyll-a ChlzD2, axial ligand; peripheral); via tele nitrogenUniRule annotation1
Binding sitei130Pheophytin D2UniRule annotation1
Binding sitei143Pheophytin D2UniRule annotation1
Metal bindingi198Magnesium (chlorophyll-a PD2 axial ligand); via tele nitrogenUniRule annotation1
Metal bindingi215Iron; shared with heterodimeric partner; via tele nitrogenUniRule annotation1
Binding sitei215Plastoquinone Q(A)UniRule annotation1
Binding sitei262Plastoquinone Q(A); via amide nitrogenUniRule annotation1
Metal bindingi269Iron; 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
OrganismiCuscuta sandwichiana (Kauna'oa)
Taxonomic identifieri197374 [NCBI]
Taxonomic lineageiEukaryotaViridiplantaeStreptophytaEmbryophytaTracheophytaSpermatophytaMagnoliophytaeudicotyledonsGunneridaePentapetalaeasteridslamiidsSolanalesConvolvulaceaeCuscuteaeCuscutaGrammicaCuscuta sect. Cleistogrammica

Subcellular locationi

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transmembranei41 – 61HelicalUniRule annotationAdd BLAST21
Transmembranei125 – 141HelicalUniRule annotationAdd BLAST17
Transmembranei153 – 166HelicalUniRule annotationAdd BLAST14
Transmembranei208 – 228HelicalUniRule annotationAdd BLAST21
Transmembranei279 – 295HelicalUniRule annotationAdd BLAST17

Keywords - Cellular componenti

Membrane, Photosystem II, Plastid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Initiator methionineiRemovedBy similarity
ChainiPRO_00003596452 – 353Photosystem II D2 proteinAdd BLAST352

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Modified residuei2N-acetylthreonineBy similarity1
Modified residuei2PhosphothreonineBy similarity1

Keywords - PTMi

Acetylation, Phosphoprotein

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

ProteinModelPortaliQ49CA8
SMRiQ49CA8
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

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

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.

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

Q49CA8-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MTITLGQSTK NDKDLFDTMD DWLRRDRFLF VGWSGLLLFP CAYFALGGWF
60 70 80 90 100
TGTTFVTSWY THGLASSYLE GCNFLTAAVS TPANSLAHSL LLLWGPEAQG
110 120 130 140 150
DFTRWCKLGG LWTFVALHGA FGLIGFMLRQ FELARSVQLR PYNAIAFSAP
160 170 180 190 200
IAVFVSVFFI YPLGQSGWFF APSFGVAAIF RFILFFQGFH NWTLNPFHMM
210 220 230 240 250
GVSGVLGAAL LCAIHGATVE NTLFEDGDGA NTFRAFNPTQ SEETYSMVTA
260 270 280 290 300
NRFWSQIFGV AFSNKRWLHF FMLFVPVTGL WMSALGVVGL ALNLRAYDFV
310 320 330 340 350
SQEIRASEDP EFETFYTKNI LLNEGIRAWM AAQDQPHENL IFPEEVLPRG

NAL
Length:353
Mass (Da):39,616
Last modified:September 13, 2005 - v1
Checksum:i6792A10612A84782
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AY936348 Genomic DNA Translation: AAY58026.1

Similar proteinsi

Entry informationi

Entry nameiPSBD_CUSSA
AccessioniPrimary (citable) accession number: Q49CA8
Entry historyiIntegrated into UniProtKB/Swiss-Prot: January 20, 2009
Last sequence update: September 13, 2005
Last modified: February 28, 2018
This is version 60 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program

Miscellaneousi

Documents

  1. SIMILARITY comments
    Index of protein domains and families

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