B1A930 · PSBD_CARPA

  • Protein
    Photosystem II D2 protein
  • Gene
    psbD
  • Status
    UniProtKB reviewed (Swiss-Prot)
  • Amino acids
  • Protein existence
    Inferred from homology
  • Annotation score
    3/5

Function

function

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/PsbD) 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.

Miscellaneous

2 of the reaction center chlorophylls (ChlD1 and ChlD2) are entirely coordinated by water.

Catalytic activity

Cofactor

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.

Features

Showing features for binding site.

TypeIDPosition(s)Description
Binding site118Mg (UniProtKB | ChEBI) of chlorophyll a ChlzD2 (UniProtKB | ChEBI); axial binding residue
Binding site130pheophytin a D2 (UniProtKB | ChEBI)
Binding site143pheophytin a D2 (UniProtKB | ChEBI)
Binding site198Mg (UniProtKB | ChEBI) of chlorophyll a PD2 (UniProtKB | ChEBI); axial binding residue
Binding site215a plastoquinone Q(A) (UniProtKB | ChEBI)
Binding site215Fe cation (UniProtKB | ChEBI); ligand shared with heterodimeric partner
Binding site262a plastoquinone Q(A) (UniProtKB | ChEBI)
Binding site269Fe cation (UniProtKB | ChEBI); ligand shared with heterodimeric partner

GO annotations

AspectTerm
Cellular Componentchloroplast thylakoid membrane
Cellular Componentphotosystem II
Molecular Functionchlorophyll binding
Molecular Functionelectron transporter, transferring electrons within the cyclic electron transport pathway of photosynthesis activity
Molecular Functioniron ion binding
Molecular Functionoxygen evolving activity
Biological Processphotosynthetic electron transport in photosystem II

Keywords

Enzyme and pathway databases

Names & Taxonomy

Protein names

  • Recommended name
    Photosystem II D2 protein
  • EC number
  • Short names
    PSII D2 protein
  • Alternative names
    • Photosystem Q(A) protein

Gene names

    • Name
      psbD

Encoded on

  • Chloroplast

Organism names

  • Taxonomic identifier
  • Strain
    • cv. SunUp
  • Taxonomic lineage
    Eukaryota > Viridiplantae > Streptophyta > Embryophyta > Tracheophyta > Spermatophyta > Magnoliopsida > eudicotyledons > Gunneridae > Pentapetalae > rosids > malvids > Brassicales > Caricaceae > Carica

Accessions

  • Primary accession
    B1A930

Subcellular Location

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane41-61Helical
Transmembrane125-141Helical
Transmembrane153-166Helical
Transmembrane208-228Helical
Transmembrane279-295Helical

Keywords

PTM/Processing

Features

Showing features for initiator methionine, modified residue, chain.

TypeIDPosition(s)Description
Initiator methionine1Removed
Modified residue2N-acetylthreonine
Modified residue2Phosphothreonine
ChainPRO_00003596292-353Photosystem II D2 protein

Keywords

Interaction

Subunit

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, Psb30/Ycf12, at least 3 peripheral proteins of the oxygen-evolving complex and a large number of cofactors. It forms dimeric complexes.

Structure

Family & Domains

Sequence similarities

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

Keywords

Phylogenomic databases

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    353
  • Mass (Da)
    39,549
  • Last updated
    2008-04-08 v1
  • Checksum
    51BBCB462A40A1C6
MTIALGKFTKDENDLFDIMDDWLRRDRFVFVGWSGLLLFPCAYFAIGGWFTGTTFVTSWYTHGLASSYLEGCNFLTAAVSTPANSLAHSLLLLWGPEAQGDFTRWCQLGGLWTFVALHGAFGLIGFMLRQFELARSVQLRPYNAIAFSGPIAVFVSVFLIYPLGQSGWFFAPSFGVAAIFRFILFFQGFHNWTLNPFHMMGVAGVLGAALLCAIHGATVENTLFEDGDGANTFRAFNPTQAEETYSMVTANRFWSQIFGVAFSNKRWLHFFMLFVPVTGLWMSALGVVGLALNLRAYDFVSQEIRAAEDPEFETFYTKNILLNEGIRAWMAAQDQPHENLIFPEEVLPRGNAL

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
EU431223
EMBL· GenBank· DDBJ
ABY86777.1
EMBL· GenBank· DDBJ
Genomic DNA

Genome annotation databases

Similar Proteins

Disclaimer

Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care. Our staff consists of biologists and biochemists that are not trained to give medical advice.
We'd like to inform you that we have updated our Privacy Notice to comply with Europe’s new General Data Protection Regulation (GDPR) that applies since 25 May 2018.
FeedbackHelp