A0A8A0WT26 · A0A8A0WT26_9FABA

  • Protein
    Photosystem I P700 chlorophyll a apoprotein A1
  • Gene
    psaA
  • Status
    UniProtKB unreviewed (TrEMBL)
  • Amino acids
  • Protein existence
    Inferred from homology
  • Annotation score
    3/5

Function

function

PsaA and PsaB bind P700, the primary electron donor of photosystem I (PSI), as well as the electron acceptors A0, A1 and FX. PSI is a plastocyanin-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn. Oxidized P700 is reduced on the lumenal side of the thylakoid membrane by plastocyanin.

Catalytic activity

Features

Showing features for binding site.

1758100200300400500600700
TypeIDPosition(s)Description
Binding site581[4Fe-4S] cluster (UniProtKB | ChEBI); ligand shared between dimeric partners
Binding site590[4Fe-4S] cluster (UniProtKB | ChEBI); ligand shared between dimeric partners
Binding site683Mg (UniProtKB | ChEBI) of chlorophyll a' A1 (UniProtKB | ChEBI); axial binding residue
Binding site691Mg (UniProtKB | ChEBI) of chlorophyll a A3 (UniProtKB | ChEBI); axial binding residue
Binding site699chlorophyll a A3 (UniProtKB | ChEBI)
Binding site700phylloquinone A (UniProtKB | ChEBI)

GO annotations

AspectTerm
Cellular Componentchloroplast thylakoid membrane
Cellular Componentphotosystem I
Molecular Function4 iron, 4 sulfur cluster binding
Molecular Functionchlorophyll binding
Molecular Functionelectron transfer activity
Molecular Functionmagnesium ion binding
Molecular Functionoxidoreductase activity
Biological Processphotosynthesis

Keywords

Enzyme and pathway databases

Names & Taxonomy

Protein names

  • Recommended name
    Photosystem I P700 chlorophyll a apoprotein A1
  • EC number
  • Alternative names
    • PSI-A
    • PsaA

Gene names

    • Name
      psaA

Encoded on

  • Chloroplast

Organism names

  • Taxonomic identifier
  • Organism
  • Taxonomic lineage
    Eukaryota > Viridiplantae > Streptophyta > Embryophyta > Tracheophyta > Spermatophyta > Magnoliopsida > eudicotyledons > Gunneridae > Pentapetalae > rosids > fabids > Fabales > Fabaceae > Papilionoideae > 50 kb inversion clade > NPAAA clade > Hologalegina > IRL clade > Fabeae > Vicia

Accessions

  • Primary accession
    A0A8A0WT26

Subcellular Location

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

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane162-184Helical
Transmembrane358-378Helical
Transmembrane398-420Helical
Transmembrane441-462Helical
Transmembrane539-557Helical
Transmembrane598-618Helical
Transmembrane672-694Helical
Transmembrane738-756Helical

Keywords

Interaction

Subunit

The PsaA/B heterodimer binds the P700 chlorophyll special pair and subsequent electron acceptors. PSI consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation. The eukaryotic PSI reaction center is composed of at least 11 subunits.

Family & Domains

Sequence similarities

Belongs to the PsaA/PsaB family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    758
  • Mass (Da)
    84,165
  • Last updated
    2021-09-29 v1
  • MD5 Checksum
    F70307CB76A8E0D8408FE29D6854C029
MIIRSPEPEVKILVDPEVKILVDRDPIKTSFEQWAKPGHFSRTIAKGPDTTTWIWNLHADAHDFDSHTSDLEEISRKIFSAHFGQLSIIFLWLSGMYFHGARFSNYEAWLNDPTHIRPSAQVVWPIVGQEILNGDVGGGFRGIQITSGFFQIWRASGITSELQLYCTAIGALVFGALMLFAGWFHYHKAAPKLAWFQDVESMLNHHLAGLLGLGSLSWAGHQVHVSLPINEFLNAGVDPKEIPLPHEFILNRDLLAQLYPSFAEGATPFFTLNWSKYADFLTFRGGLDPLTGGLWLTDIAHHHLAIAILFLIAGHMYRTNWGIGHGIKDILEAHKGPFTGQGHKGLYEILTTSWHAQLSINLAMLGSLTIIVAHHMYAMPPYPYLATDYGTQLSLFTHHMWIGGFLIVGAAAHAAIFMVRDYDPTTRYNDLLDRVLRHRDAIISHLNWVCLFLGFHSFGLYIHNDTMSALGRPQDMFSDTAIQLQPVFAQWIQNTHALAPGTTAPGATTSTSLTWGGGDLVAVGGKVALLPIPLGTADFLVHHIHAFTIHVTVLILLKGVLFARSSRLIPDKANLGFRFPCDGPGRGGTCQVSAWDHVFLGLFWMYNAISVVIFHFSWKMQSDVWGSLNDQGVVTHITGGNFAQSSITINGWLRDFLWAQASQVIQSYGSSLSAYGLFFLGAHFVWAFSLMFLFSGRGYWQELIESIVWAHNKLKVAPATQPRALSIVQGRAVGVTHYLLGGIATTWAFFLARIIAVG

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
MT742292
EMBL· GenBank· DDBJ
QSQ72466.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

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