A0A097KPX8 · A0A097KPX8_GEMMI

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/cytochrome c6-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 or cytochrome c6.

Catalytic activity

Features

Showing features for binding site.

1751100200300400500600700
TypeIDPosition(s)Description
Binding site575[4Fe-4S] cluster (UniProtKB | ChEBI); ligand shared between dimeric partners
Binding site584[4Fe-4S] cluster (UniProtKB | ChEBI); ligand shared between dimeric partners
Binding site676Mg (UniProtKB | ChEBI) of chlorophyll a' A1 (UniProtKB | ChEBI); axial binding residue
Binding site684Mg (UniProtKB | ChEBI) of chlorophyll a A3 (UniProtKB | ChEBI); axial binding residue
Binding site692chlorophyll a A3 (UniProtKB | ChEBI)
Binding site693phylloquinone 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
    A0A097KPX8

Subcellular Location

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane73-93Helical
Transmembrane157-179Helical
Transmembrane353-373Helical
Transmembrane393-415Helical
Transmembrane436-457Helical
Transmembrane533-551Helical
Transmembrane592-612Helical
Transmembrane665-687Helical
Transmembrane728-749Helical

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
    751
  • Mass (Da)
    83,179
  • Last updated
    2015-01-07 v1
  • Checksum
    F637D1140AE3E624
MTISPPEREAKKVKIVVDRNPIETSFEKWAKPGHFSRTLSKGPSTTTWIWNLHADAHDFDSHTSDLEEISRKVFSAHFGQLGIILIWLSGMYFHGARFSNYEAWLNDPTHIKPSAQVVWPIVGQEILNGDVGGGFQGIQITSGFFQLWRASGITSELQLYSTAIGGLVLAAAMFFAGWFHYHKAAPKLEWFQNVESMLNHHLAGLLGLGSLAWAGHQIHVSLPINKLLDAGVDPKEIPLPHELILNRDLIAQLYPSFSKGLAPFFTINWAEYSDFLTFKGGLNPVTGGLWLTDTAHHHLAIAVLFLIAGHMYRTNWGIGHSLKEILEAHKGPFTGEGHKGLYEILTTSWHAQLAINLALFGSLSIIVAHHMYSMPPYPYLATDYGTQLSLFTHHTWIGGFCIVGAGAHAAIFMVRDYDPTNNYNNLLDRVIRHRDSIISHLNWVCIFLGFHSFGLYIHNDTLSALGRPQDMFSDTAIQLQPVFAQWVQNTHFLAPGFTAPNALASTSPSWGGDIVAVGGKIAMMPISLGTADFLVHHIHAFTIHVTVLILLKGVLYARSSRLIPDKANLGFRFPCDGPGRGGTCQVSAWDHVFLGLFWMYNSLSIVIFHFSWKMQSDVWGTVTASGVSHITGGNFAQSANTINGWLRDFLWAQSSQVIQSYGSALSAYGLMFLGAHFVWAFSLMFLFSGRGYWQELIESIVWAHNKLKVAPAIQPRALSITQGRAVGVAHYLLGGIATTWSFFLARILAVG

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
KM462883
EMBL· GenBank· DDBJ
AIT95248.1
EMBL· GenBank· DDBJ
Genomic DNA

Genome annotation databases

Similar Proteins

Disclaimer

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