A0A1Y1CV60 · A0A1Y1CV60_DENMN

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.

Miscellaneous

2 of the reaction center chlorophylls (ChlD1 and ChlD2) are entirely coordinated by water.
Herbicides such as atrazine, BNT, diuron or ioxynil bind in the Q(B) binding site and block subsequent electron transfer.

Catalytic activity

Features

Showing features for binding site, site.

TypeIDPosition(s)Description
Binding site133Mg (UniProtKB | ChEBI) of chlorophyll a ChlzD1 (UniProtKB | ChEBI); axial binding residue
Binding site141pheophytin a D1 (UniProtKB | ChEBI)
Site176Tyrosine radical intermediate
Binding site185[CaMn4O5] cluster (UniProtKB | ChEBI)
Binding site204[CaMn4O5] cluster (UniProtKB | ChEBI)
Site205Stabilizes free radical intermediate
Binding site213Mg (UniProtKB | ChEBI) of chlorophyll a PD1 (UniProtKB | ChEBI); axial binding residue
Binding site230Fe cation (UniProtKB | ChEBI); ligand shared with heterodimeric partner
Binding site230a quinone B (UniProtKB | ChEBI)
Binding site279-280a quinone B (UniProtKB | ChEBI)
Binding site287Fe cation (UniProtKB | ChEBI); ligand shared with heterodimeric partner
Binding site347[CaMn4O5] cluster (UniProtKB | ChEBI)
Binding site348[CaMn4O5] cluster (UniProtKB | ChEBI)
Binding site357[CaMn4O5] cluster (UniProtKB | ChEBI)
Binding site359[CaMn4O5] cluster (UniProtKB | ChEBI)
Site359-360Cleavage; by CtpA

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 Functionoxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor
Molecular Functionoxygen evolving activity
Biological Processphotosynthetic electron transport in photosystem II
Biological Processresponse to herbicide

Keywords

Enzyme and pathway databases

Names & Taxonomy

Protein names

  • Recommended name
    Photosystem II protein D1
  • EC number
  • Short names
    PSII D1 protein
  • Alternative names
    • Photosystem II Q(B) protein

Gene names

    • Name
      psbA

Encoded on

  • Chloroplast

Organism names

Accessions

  • Primary accession
    A0A1Y1CV60

Subcellular Location

Membrane
; Multi-pass membrane protein
Plastid, chloroplast thylakoid membrane
; Multi-pass membrane protein

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane44-70Helical
Transmembrane91-112Helical
Transmembrane124-144Helical
Transmembrane156-176Helical
Transmembrane213-233Helical
Transmembrane288-310Helical

Keywords

PTM/Processing

Features

Showing features for initiator methionine, modified residue, chain, propeptide.

TypeIDPosition(s)Description
Initiator methionine16Removed
Modified residue17N-acetylthreonine
Modified residue17Phosphothreonine
ChainPRO_502339571917-359Photosystem II protein D1
PropeptidePRO_5011014754360-368

Post-translational modification

C-terminally processed by CtpA; processing is essential to allow assembly of the oxygen-evolving complex and thus photosynthetic growth.
Tyr-176 forms a radical intermediate that is referred to as redox-active TyrZ, YZ or Y-Z.

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
    368
  • Mass (Da)
    40,538
  • Last updated
    2017-08-30 v1
  • Checksum
    77D8358DF8E4A625
MCLGVLENGINQDLTMTAILERRESTSLWGRFCNWITSTENRLYIGWFGVLMIPTLLTATSVFIIAFIAAPPVDIDGIREPVSGSLLYGNNIISGAIIPTSAAIGLHFYPIWEAASVDEWLYNGGPYELIVLHFLLGVACYMGREWELSFRLGMRPWIAVAYSAPVAAATAVFLIYPIGQGSFSDGMPLGISGTFNFMIVFQAEHNILMHPFHMLGVAGVFGGSLFSAMHGSLVTSSLIRETTENESANEGYRFGQEEETYNIVAAHGYFGRLIFQYASFNNSRSLHFFLAAWPVVGIWFTALGISTMAFNLNGFNFNQSVVDSQGRVINTWADIINRANLGMEVMHERNAHNFPLDLASVEAPSING

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
AB893950
EMBL· GenBank· DDBJ
BAX84154.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

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