O96804 · PSAC_SKECO

Function

function

Apoprotein for the two 4Fe-4S centers FA and FB of photosystem I (PSI); essential for photochemical activity. FB is the terminal electron acceptor of PSI, donating electrons to ferredoxin. The C-terminus interacts with PsaA/B/D and helps assemble the protein into the PSI complex. Required for binding of PsaD and PsaE to PSI. 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.

Catalytic activity

Cofactor

[4Fe-4S] cluster (UniProtKB | Rhea| CHEBI:49883 )

Note: Binds 2 [4Fe-4S] clusters. Cluster 2 is most probably the spectroscopically characterized electron acceptor FA and cluster 1 is most probably FB.

Features

Showing features for binding site.

TypeIDPosition(s)Description
Binding site11[4Fe-4S] cluster 1 (UniProtKB | ChEBI)
Binding site14[4Fe-4S] cluster 1 (UniProtKB | ChEBI)
Binding site17[4Fe-4S] cluster 1 (UniProtKB | ChEBI)
Binding site21[4Fe-4S] cluster 2 (UniProtKB | ChEBI)
Binding site48[4Fe-4S] cluster 2 (UniProtKB | ChEBI)
Binding site51[4Fe-4S] cluster 2 (UniProtKB | ChEBI)
Binding site54[4Fe-4S] cluster 2 (UniProtKB | ChEBI)
Binding site58[4Fe-4S] cluster 1 (UniProtKB | ChEBI)

GO annotations

AspectTerm
Cellular Componentchloroplast thylakoid membrane
Cellular Componentphotosystem I
Molecular Function4 iron, 4 sulfur cluster binding
Molecular Functionelectron transfer activity
Molecular Functionmetal ion binding
Molecular Functionoxidoreductase activity
Biological Processphotosynthetic electron transport in photosystem I

Keywords

Enzyme and pathway databases

Names & Taxonomy

Protein names

  • Recommended name
    Photosystem I iron-sulfur center
  • EC number
  • Alternative names
    • 9 kDa polypeptide
    • PSI-C
    • Photosystem I subunit VII
    • PsaC

Gene names

    • Name
      psaC

Encoded on

  • Chloroplast

Organism names

Accessions

  • Primary accession
    O96804

Subcellular Location

Keywords

PTM/Processing

Features

Showing features for initiator methionine, chain.

TypeIDPosition(s)Description
Initiator methionine1Removed
ChainPRO_00000620042-81Photosystem I iron-sulfur center

Interaction

Subunit

The eukaryotic PSI reaction center is composed of at least 11 subunits.

Structure

Family & Domains

Features

Showing features for domain.

TypeIDPosition(s)Description
Domain2-314Fe-4S ferredoxin-type 1
Domain37-684Fe-4S ferredoxin-type 2

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    81
  • Mass (Da)
    8,798
  • Last updated
    2007-01-23 v3
  • Checksum
    0B3E4CEB35F50C9B
MSHTVKIYDTCIGCTQCVRACPTDVLEMVPWDGCKSGQIASSPRVEDCVGCKRCETACPTDFLSVRVYLGAETTRSLGLAY

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
AJ132264
EMBL· GenBank· DDBJ
CAA10625.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

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