A0A8F8SQS7 · A0A8F8SQS7_CONCI

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 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

Accessions

  • Primary accession
    A0A8F8SQS7

Subcellular Location

Membrane
; Multi-pass membrane protein
Plastid, chloroplast thylakoid 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
Transmembrane727-748Helical

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)
    83,222
  • Last updated
    2022-01-19 v1
  • Checksum
    AB5973153C81F55C
MTIRSPEPEVKIVVEKDPVKTSFEKWAKPGHFSRTLAKGPSTTTWIWNLHADAHDFDSHTNDLEEISRKVFSAHFGQLAIIFIWLSGMYFHGARFSNYEAWLSDPTHIKPSAQVVWPIVGQEILNGDVGGGFQGIQITSGFFQLWRASGITSELQLYCTAIGGLVFAALMLFAGWFHYHKAAPKLAWFQDVESMLNHHLAGLLGLGSLSWAGHQVHVSLPINQLLDAGVDPKEIPLPHEFILNRDLLAELYPSFAKGLTPFFTLNWSEYSDFLTFRGGLNPVTGGLWLTDTVHHHLAIAVLFLVAGHMYRTNWGIGHSFKEILEAHKGPFTGEGHKGLYEILTTSWHAQLALNLAMLGSLTIIVAHHMYSMPPYPYLATDYGTQLSLFTHHMWIGGFLIVGAAAHAAIFMVRDYDPTTQYNNLLDRVLRHRDAIISHLNWVCIFLGFHSFGLYIHNDTMSALGRPQDMFSDTAIQLQPVFAQWIQNTHALAPNFTAPNASASTSLTWGGGDVIAVGSKVALLPIPLGTADFLVHHIHAFTIHVTVLILLKGVLFARSSRLIPDKANLGFRFPCDGPGRGGTCQVSAWDHVFLGLFWMYNSISVVIFHFSWKMQSDVWGTLSDKGVVTHITGGNFAQSATTINGWLRDFLWAQASQVIQSYGSSLSAYGLLFLGAHFVWAFSLMFLFSGRGYWQELIESIVWAHNKLKVAPAIQPRALSITQGRAVGVAHYLLGGIATTWAFFLARIIAVG

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
MT023024
EMBL· GenBank· DDBJ
QYB18650.1
EMBL· GenBank· DDBJ
Genomic DNA
MT023025
EMBL· GenBank· DDBJ
QYB18737.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

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