A0A8K1HLI1 · A0A8K1HLI1_9MAGN

  • Protein
    Photosystem I P700 chlorophyll a apoprotein A2
  • Gene
    psaB
  • 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.

1735100200300400500600700
TypeIDPosition(s)Description
Binding site560[4Fe-4S] cluster (UniProtKB | ChEBI); ligand shared between dimeric partners
Binding site569[4Fe-4S] cluster (UniProtKB | ChEBI); ligand shared between dimeric partners
Binding site655Mg (UniProtKB | ChEBI) of chlorophyll a B1 (UniProtKB | ChEBI); axial binding residue
Binding site663Mg (UniProtKB | ChEBI) of chlorophyll a B3 (UniProtKB | ChEBI); axial binding residue
Binding site671chlorophyll a B3 (UniProtKB | ChEBI)
Binding site672phylloquinone B (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 A2
  • EC number
  • Alternative names
    • PSI-B
    • PsaB

Gene names

    • Name
      psaB
    • ORF names
      Lod_N6912Cp019
      , Lod_Su160Cp019
      , LorDeliCp019

Encoded on

  • Chloroplast

Organism names

  • Taxonomic identifier
  • Organism
  • Taxonomic lineage
    Eukaryota > Viridiplantae > Streptophyta > Embryophyta > Tracheophyta > Spermatophyta > Magnoliopsida > eudicotyledons > Gunneridae > Pentapetalae > Santalales > Loranthaceae > Lorantheae > Loranthinae > Loranthus

Accessions

  • Primary accession
    A0A8K1HLI1

Subcellular Location

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

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane136-158Helical
Transmembrane179-200Helical
Transmembrane274-292Helical
Transmembrane331-350Helical
Transmembrane378-397Helical
Transmembrane418-439Helical
Transmembrane518-536Helical
Transmembrane576-597Helical
Transmembrane646-666Helical
Transmembrane708-728Helical

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
    735
  • Mass (Da)
    82,556
  • Last updated
    2022-08-03 v1
  • Checksum
    B00A1DAF092B2E93
MALRFPRFSQGLTQDPTTRRIWFGIATAHDFESHDDIITEERLYQNIFASHFGQLAIIFLWTSGNLFHVAWQGNFEAWVKDPLHVRPIAHAIWDPHFGQSAVEAFTRGGALGPVNIAYSGVYQWWYTIGLRTNEDLYTGALFLLFISALSLIGGWLHLQPKWKPSVSWFKNAESRLNHHLSGLFGVSSLAWTGHLVHVAIPGSRGEYVRWNNFAAVLPHPLGLGPFFTGHWNLYAQNPDLNSHLFGTSQGAGTAILTLLGGFHPQTQSLWMTDIAHHHLAIAFIFLVAGHMYRTNFGIGHSMKNILETHIPPGGVLGRGHKGLYDTINNSLHFQLGLALGSLGVITSLVAQHMYSLPAYAFIAQDFTTQAALYTHHQYIAGFIMTGAFAHGAIFFIRDYNPEQNKDNVLARMLDHKEAIISHLSWASLFLGFHTLGLYVHNDVMLAFGTPEKQILIEPVFAQWIQSAHGKTSYGFDVLLSSTNGPAFNASRSIWLPGWLTAINENSNSLFLTIGPGDFLVHHAIALGLHTTTLILVKGALDARGSKLVPDKKDFGYSFPCDGPGRGGTCDISAWDAFYLAVFWMLNTIGWVTFYWHWKHITLWQGNVSQFNESSTYLMGWLRDYLWLNSSQLINGYNPFGMNSLSVWAWMFLFGHLVWATGFMFLISWRGYWQELIETLTWAHERTPLANLIRWRDKPVALSIVQARLVGLAHFSVGYIFTYAAFLIASTSSKFG

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
MT987624
EMBL· GenBank· DDBJ
UBN07615.1
EMBL· GenBank· DDBJ
Genomic DNA
MT987626
EMBL· GenBank· DDBJ
UBN07745.1
EMBL· GenBank· DDBJ
Genomic DNA
MT987628
EMBL· GenBank· DDBJ
UBN07874.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

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