A0A0R6LUS4 · A0A0R6LUS4_UNDPI

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.

Type
IDPosition(s)Description
Binding site119Mg (UniProtKB | ChEBI) of chlorophyll a ChlzD1 (UniProtKB | ChEBI); axial binding residue
Binding site127pheophytin a D1 (UniProtKB | ChEBI)
Site162Tyrosine radical intermediate
Binding site171[CaMn4O5] cluster (UniProtKB | ChEBI)
Binding site190[CaMn4O5] cluster (UniProtKB | ChEBI)
Site191Stabilizes free radical intermediate
Binding site199Mg (UniProtKB | ChEBI) of chlorophyll a PD1 (UniProtKB | ChEBI); axial binding residue
Binding site216Fe cation (UniProtKB | ChEBI); ligand shared with heterodimeric partner
Binding site216a quinone B (UniProtKB | ChEBI)
Binding site265-266a quinone B (UniProtKB | ChEBI)
Binding site273Fe cation (UniProtKB | ChEBI); ligand shared with heterodimeric partner
Binding site333[CaMn4O5] cluster (UniProtKB | ChEBI)
Binding site334[CaMn4O5] cluster (UniProtKB | ChEBI)
Binding site343[CaMn4O5] cluster (UniProtKB | ChEBI)
Binding site345[CaMn4O5] cluster (UniProtKB | ChEBI)
Site345-346Cleavage; 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
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
    • ORF names
      LEIZ85

Encoded on

  • Chloroplast

Organism names

Accessions

  • Primary accession
    A0A0R6LUS4

Subcellular Location

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

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane30-56Helical
Transmembrane110-130Helical
Transmembrane142-165Helical
Transmembrane201-225Helical
Transmembrane271-296Helical

Keywords

PTM/Processing

Features

Showing features for chain, propeptide.

Type
IDPosition(s)Description
ChainPRO_50345263991-345Photosystem II protein D1
PropeptidePRO_5034526400346-361

Post-translational modification

C-terminally processed by CtpA; processing is essential to allow assembly of the oxygen-evolving complex and thus photosynthetic growth.
Tyr-162 forms a radical intermediate that is referred to as redox-active TyrZ, YZ or Y-Z.

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
    361
  • Mass (Da)
    39,742
  • Last updated
    2016-02-17 v1
  • Checksum
    701DF6072A424646
MVATLERRESEKRDWGTFATWITSTENRLYIGWFGCLMIPTLLTAASCYIIAFIAAPPVDIDGIREPVAGSLLYGNNIISGAVIPSSNAIGIHFYPIWEAASVEEWLYNGGPYQLIVFHFLIGVACWMGREWELSYRLGMRPWIFVAFSAPVAAASAVFLVYPIGQGSFSDGMPLGISGTFNFMIVFQAEHNILMHPFHMAGVAGVFGGSLFSAMHGSLVTSSLIRETSEVESVNYGYKFGQEEETYNIVAAHGYFGRLIFQYASFNNSRALHFFLAAWPVVGIWLTALGVSTMAFNLNGFNFNQSVVDSEGRVINTWADIINRADLGMEVMHERNAHNFPLDLASNEILPVAISAPSVVG

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
KP298002
EMBL· GenBank· DDBJ
AKG49980.1
EMBL· GenBank· DDBJ
Genomic DNA
KU200463
EMBL· GenBank· DDBJ
AMM05437.1
EMBL· GenBank· DDBJ
Genomic DNA

Genome annotation databases

Similar Proteins

Disclaimer

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