A0A1B1W4T6 · A0A1B1W4T6_ARATH
- ProteinPhotosystem I P700 chlorophyll a apoprotein A1
- GenepsaA
- StatusUniProtKB unreviewed (TrEMBL)
- Amino acids750 (go to sequence)
- Protein existenceInferred from homology
- Annotation score3/5
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
- reduced [plastocyanin] + hnu + oxidized [2Fe-2S]-[ferredoxin] = oxidized [plastocyanin] + reduced [2Fe-2S]-[ferredoxin]
Features
Showing features for binding site.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Binding site | 573 | [4Fe-4S] cluster (UniProtKB | ChEBI); ligand shared between dimeric partners | ||||
Sequence: C | ||||||
Binding site | 582 | [4Fe-4S] cluster (UniProtKB | ChEBI); ligand shared between dimeric partners | ||||
Sequence: C | ||||||
Binding site | 675 | Mg (UniProtKB | ChEBI) of chlorophyll a' A1 (UniProtKB | ChEBI); axial binding residue | ||||
Sequence: H | ||||||
Binding site | 683 | Mg (UniProtKB | ChEBI) of chlorophyll a A3 (UniProtKB | ChEBI); axial binding residue | ||||
Sequence: M | ||||||
Binding site | 691 | chlorophyll a A3 (UniProtKB | ChEBI) | ||||
Sequence: Y | ||||||
Binding site | 692 | phylloquinone A (UniProtKB | ChEBI) | ||||
Sequence: W |
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | chloroplast thylakoid membrane | |
Cellular Component | photosystem I | |
Molecular Function | 4 iron, 4 sulfur cluster binding | |
Molecular Function | chlorophyll binding | |
Molecular Function | electron transfer activity | |
Molecular Function | magnesium ion binding | |
Molecular Function | oxidoreductase activity | |
Biological Process | photosynthesis |
Keywords
- Molecular function
- Biological process
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended namePhotosystem I P700 chlorophyll a apoprotein A1
- EC number
- Alternative names
Gene names
Encoded on
- Chloroplast
Organism names
- Strain
- Taxonomic lineageEukaryota > Viridiplantae > Streptophyta > Embryophyta > Tracheophyta > Spermatophyta > Magnoliopsida > eudicotyledons > Gunneridae > Pentapetalae > rosids > malvids > Brassicales > Brassicaceae > Camelineae > Arabidopsis
Accessions
- Primary accessionA0A1B1W4T6
Organism-specific databases
Genome annotation databases
Subcellular Location
UniProt Annotation
GO Annotation
Membrane ; Multi-pass membrane protein
Plastid, chloroplast thylakoid membrane ; Multi-pass membrane protein
Features
Showing features for transmembrane.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Transmembrane | 154-176 | Helical | ||||
Sequence: LQLYCTAIGALVFAALMLFAGWF | ||||||
Transmembrane | 350-370 | Helical | ||||
Sequence: LSLNLAMLGSLTIIVAHHMYS | ||||||
Transmembrane | 390-412 | Helical | ||||
Sequence: HHMWIGGFLIVGAAAHAAIFMVR | ||||||
Transmembrane | 433-454 | Helical | ||||
Sequence: AIISHLNWVCIFLGFHSFGLYI | ||||||
Transmembrane | 531-549 | Helical | ||||
Sequence: FLVHHIHAFTIHVTVLILL | ||||||
Transmembrane | 590-610 | Helical | ||||
Sequence: VFLGLFWMYNAISVVIFHFSW | ||||||
Transmembrane | 664-686 | Helical | ||||
Sequence: LSAYGLFFLGAHFVWAFSLMFLF | ||||||
Transmembrane | 730-748 | Helical | ||||
Sequence: YLLGGIATTWAFFLARIIA |
Keywords
- Cellular component
Expression
Gene expression databases
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.
Structure
Sequence
- Sequence statusComplete
- Length750
- Mass (Da)83,231
- Last updated2016-11-02 v1
- Checksum5FBA9F75A1BC078A
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
KX551970 EMBL· GenBank· DDBJ | ANW47790.1 EMBL· GenBank· DDBJ | Genomic DNA | ||
MK353213 EMBL· GenBank· DDBJ | QBI37796.1 EMBL· GenBank· DDBJ | Genomic DNA | ||
MK380719 EMBL· GenBank· DDBJ | QDK58685.1 EMBL· GenBank· DDBJ | Genomic DNA | ||
MK380720 EMBL· GenBank· DDBJ | QDK58770.1 EMBL· GenBank· DDBJ | Genomic DNA | ||
MK380721 EMBL· GenBank· DDBJ | QDK58855.1 EMBL· GenBank· DDBJ | Genomic DNA | ||
MN603471 EMBL· GenBank· DDBJ | QXM16429.1 EMBL· GenBank· DDBJ | Genomic DNA |