A0A7S9EXM5 · A0A7S9EXM5_9APIA

  • 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.

1750100200300400500600700
TypeIDPosition(s)Description
Binding site573[4Fe-4S] cluster (UniProtKB | ChEBI); ligand shared between dimeric partners
Binding site582[4Fe-4S] cluster (UniProtKB | ChEBI); ligand shared between dimeric partners
Binding site675Mg (UniProtKB | ChEBI) of chlorophyll a' A1 (UniProtKB | ChEBI); axial binding residue
Binding site683Mg (UniProtKB | ChEBI) of chlorophyll a A3 (UniProtKB | ChEBI); axial binding residue
Binding site691chlorophyll a A3 (UniProtKB | ChEBI)
Binding site692phylloquinone A (UniProtKB | ChEBI)

GO annotations

AspectTerm
Cellular Componentchloroplast
Cellular Componentphotosystem I
Cellular Componentthylakoid membrane
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
    • PsaA

Gene names

    • Name
      psaA

Encoded on

  • Plastid

Organism names

  • Taxonomic identifier
  • Organism
  • Taxonomic lineage
    Eukaryota > Viridiplantae > Streptophyta > Embryophyta > Tracheophyta > Spermatophyta > Magnoliopsida > eudicotyledons > Gunneridae > Pentapetalae > asterids > campanulids > Apiales > Apiaceae > Apioideae > Acronema clade > Meeboldia

Accessions

  • Primary accession
    A0A7S9EXM5

Subcellular Location

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

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane70-90Helical
Transmembrane154-176Helical
Transmembrane350-370Helical
Transmembrane390-412Helical
Transmembrane433-454Helical
Transmembrane531-549Helical
Transmembrane590-610Helical
Transmembrane664-686Helical
Transmembrane730-748Helical

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
    750
  • Mass (Da)
    83,162
  • Last updated
    2021-06-02 v1
  • Checksum
    56E5EEA4BB2A4830
MIIRSPEPEVKILVDRDHIKTSFEEWARPGHFSRTLAKGPDTTTWIWNLHADAHDFDSHTSDLEEISRKVFSAHFGQLSIIFLWLSGMYFHGARFSNYEAWLSDPTHIGPSAQVVWPIVGQEILNGDVGGGFRGIQITSGFFQLWRASGITSELQLYCTAIGALIFAALMLFAGWFHYHKAAPKLAWFQDVESMLNHHLAGLLGLGSLSWAGHQVHVSLPINQFLNAGVDPKEIPLPHEFILNRDLLAQLYPSFAEGATPFFTLNWSKYSDFLTFRGGLDPVTGGLWLTDIAHHHLAIAILFLIAGHMYKTNWGIGHGLKDILEAHKGPFTGQGHKGLYEILTTSWHAQLSLNLAMLGSLTIIVAHHMYSMPPYPYLATDYGTQLSLFTHHMWIGGFLIVGAAAHAAIFMVRDYDPTTRYNDLLDRVLRHRDAIISHLNWACIFLGFHSFGLYIHNDTMSALGRPQDMFSDTAIQLQPVFAQWIQNTHALAPSATAPGATTSTSLTWGGGDLVAVGGKVALLPIPLGTADFLVHHIHAFTIHVTVLILLKGVLFARSSRLIPDKANLGFRFPCDGPGRGGTCQVSAWDHVFLGLFWMYNAISVVIFHFSWKMQSDVWGSISDQGVVTHITGGNFAQSSITINGWLRDFLWAQASQVIQSYGSSLSAYGLFFLGAHFVWAFSLMFLFSGRGYWQELIESIVWAHNKLKVAPATQPRALSIVQGRAVGVTHYLLGGIATTWAFFLARIIAVG

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
MT843764
EMBL· GenBank· DDBJ
QPG24093.1
EMBL· GenBank· DDBJ
Genomic DNA
MK993275
EMBL· GenBank· DDBJ
QPL15501.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

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