A0A8H2SIE1 · A0A8H2SIE1_9STRA

  • Protein
    Photosystem II D2 protein
  • Gene
    psbD
  • Status
    UniProtKB unreviewed (TrEMBL)
  • 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

Features

Showing features for binding site.

135150100150200250300350
TypeIDPosition(s)Description
Binding site116Mg (UniProtKB | ChEBI) of chlorophyll a ChlzD2 (UniProtKB | ChEBI); axial binding residue
Binding site128pheophytin a D2 (UniProtKB | ChEBI)
Binding site141pheophytin a D2 (UniProtKB | ChEBI)
Binding site196Mg (UniProtKB | ChEBI) of chlorophyll a PD2 (UniProtKB | ChEBI); axial binding residue
Binding site213Fe cation (UniProtKB | ChEBI); ligand shared with heterodimeric partner
Binding site213a plastoquinone Q(A) (UniProtKB | ChEBI)
Binding site260a plastoquinone Q(A) (UniProtKB | ChEBI)
Binding site267Fe cation (UniProtKB | ChEBI); ligand shared with heterodimeric partner

GO annotations

AspectTerm
Cellular Componentphotosystem II
Cellular Componentplastid
Cellular Componentthylakoid membrane
Molecular Functionchlorophyll binding
Molecular Functionelectron transporter, transferring electrons within the cyclic electron transport pathway of photosynthesis activity
Molecular Functioniron ion binding
Molecular Functionoxidoreductase 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
    • ORF names
      IV203_000130

Encoded on

  • Plastid

Organism names

  • Taxonomic identifier
  • Organism
  • Strain
    • Hildebrandi
  • Taxonomic lineage
    Eukaryota > Sar > Stramenopiles > Ochrophyta > Bacillariophyta > Bacillariophyceae > Bacillariophycidae > Bacillariales > Bacillariaceae > Nitzschia

Accessions

  • Primary accession
    A0A8H2SIE1

Proteomes

Subcellular Location

Cellular thylakoid membrane
; Multi-pass membrane protein
Membrane
; Multi-pass membrane protein

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane26-48Helical
Transmembrane109-127Helical
Transmembrane139-159Helical
Transmembrane165-183Helical
Transmembrane195-215Helical
Transmembrane265-290Helical

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.

Family & Domains

Sequence similarities

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

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    351
  • Mass (Da)
    39,034
  • Last updated
    2022-01-19 v1
  • Checksum
    D2AD870CA17062F7
MTIAIGQNQERGLFDLVDDWLKKDRFVFVGWSGLLLFPTAYLAAGGWMTGTTFVTSWYTHGLASSYLEGCNFLTAAVSTPANSMGHSLLLLWGPEAQGDFTRWCQIGGLWTFVALHGAFGLIGFCLRQFEIARLVGIRPYNAIAFSGPIAVFVSVFLLYPLGQASWFFAPSFGVAAIFRFLLFLQGFHNWTLNPFHMMGVAGILGGALLCAIHGATVENTLFEDGDAANTFRAFTPTQSEETYSMVTANRFWSQIFGVAFSNKRWLHFFMLFVPVTGLWTSAIGIVGLALNLRAYDFVSQELRAAEDPEFETFYTKNILLNEGIRAWMAAQDQPHENFVFPEEVLPRGNAL

Computationally mapped potential isoform sequences

There is 1 potential isoform mapped to this entry

View all
EntryEntry nameGene nameLength
A0A9K3L4C7A0A9K3L4C7_9STRAIV203_000130299

Keywords

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
MW971520
EMBL· GenBank· DDBJ
QXE46201.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

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