A0A6P0KZ41 · A0A6P0KZ41_9CYAN

  • Protein
    Photosystem II protein D1
  • Gene
    psbA
  • Status
    UniProtKB unreviewed (TrEMBL)
  • Amino acids
  • Protein existence
    Inferred from homology
  • Annotation score
    4/5

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.

Miscellaneous

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

Caution

The sequence shown here is derived from an EMBL/GenBank/DDBJ whole genome shotgun (WGS) entry which is preliminary data.

Catalytic activity

Features

Showing features for binding site, site.

TypeIDPosition(s)Description
Binding site117Mg (UniProtKB | ChEBI) of chlorophyll a ChlzD1 (UniProtKB | ChEBI); axial binding residue
Binding site125pheophytin a D1 (UniProtKB | ChEBI)
Site160Tyrosine radical intermediate
Binding site169[CaMn4O5] cluster (UniProtKB | ChEBI)
Binding site188[CaMn4O5] cluster (UniProtKB | ChEBI)
Site189Stabilizes free radical intermediate
Binding site197Mg (UniProtKB | ChEBI) of chlorophyll a PD1 (UniProtKB | ChEBI); axial binding residue
Binding site214Fe cation (UniProtKB | ChEBI); ligand shared with heterodimeric partner
Binding site214a quinone B (UniProtKB | ChEBI)
Binding site263-264a quinone B (UniProtKB | ChEBI)
Binding site271Fe cation (UniProtKB | ChEBI); ligand shared with heterodimeric partner
Binding site331[CaMn4O5] cluster (UniProtKB | ChEBI)
Binding site332[CaMn4O5] cluster (UniProtKB | ChEBI)
Binding site341[CaMn4O5] cluster (UniProtKB | ChEBI)
Binding site343[CaMn4O5] cluster (UniProtKB | ChEBI)
Site343-344Cleavage; by CtpA

GO annotations

AspectTerm
Cellular Componentphotosystem II
Cellular Componentplasma membrane-derived thylakoid 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, 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
    • ORF names
      F6J90_18040
      , F6J90_26610
      , F6J90_26620
      , F6J90_31680
      , F6J90_31690

Organism names

  • Taxonomic identifier
  • Organism
  • Strain
    • SIOASIH
  • Taxonomic lineage
    Bacteria > Cyanobacteriota > Cyanophyceae > Oscillatoriophycideae > Oscillatoriales > Oscillatoriaceae > Moorena

Accessions

  • Primary accession
    A0A6P0KZ41

Proteomes

Subcellular Location

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

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane28-54Helical
Transmembrane108-126Helical
Transmembrane138-160Helical
Transmembrane197-217Helical
Transmembrane272-294Helical

Keywords

PTM/Processing

Features

Showing features for chain, propeptide.

TypeIDPosition(s)Description
ChainPRO_50347277241-343Photosystem II protein D1
PropeptidePRO_5034727725344-359

Post-translational modification

C-terminally processed by CtpA; processing is essential to allow assembly of the oxygen-evolving complex and thus photosynthetic growth.
Tyr-160 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, peripheral proteins PsbO, CyanoQ (PsbQ), PsbU, PsbV 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
    359
  • Mass (Da)
    39,516
  • Last updated
    2020-10-07 v1
  • Checksum
    6F45422672DD749F
MTTVLQQSNTSVWSQFCNWVTSTNNRLYVGWFGILMIPTLLAATTCFIIAFIAAPPVDIDGIREPVAGSLMYGNNIISGAVVPSSNAIGLHFYPIWEAASLDEWLYNGGPYQLVVFHFLIGVFAYMGREWELSYRLGMRPWICVAYSAPVAAASAVFLIYPIGQGSFSDGMPLGISGTFNFMFVFQAEHNILMHPFHMLGVAGVFGGSLFSAMHGSLVTSSLVRETTETESQNYGYKFGQEEETYNIVAAHGYFGRLIFQYASFNNSRSLHFFLGAWPVIGIWFTALGISTMAFNLNGFNFNQSIIDSQGHVINTWADVLNRANLGFEVMHERNAHNFPLDLAAAEATPVALTAPVING

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
JAAHIH010000003
EMBL· GenBank· DDBJ
NEO38127.1
EMBL· GenBank· DDBJ
Genomic DNA
JAAHIH010000004
EMBL· GenBank· DDBJ
NEO39708.1
EMBL· GenBank· DDBJ
Genomic DNA
JAAHIH010000004
EMBL· GenBank· DDBJ
NEO39709.1
EMBL· GenBank· DDBJ
Genomic DNA
JAAHIH010000006
EMBL· GenBank· DDBJ
NEO40650.1
EMBL· GenBank· DDBJ
Genomic DNA
JAAHIH010000006
EMBL· GenBank· DDBJ
NEO40651.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

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