Protein: Photosystem I P700 chlorophyll a apoprotein A2 (EC 1.97.1.12) (PSI-B) (PsaB) (Q6ENH5)
Organism: Oryza nivara (Indian wild rice) (Oryza sativa f. spontanea)
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.
Subcellular location: Plastid, chloroplast thylakoid membrane; Multi-pass membrane protein.
Sequence: MELRFPRFSQGLAQDPTTRRIWFGIATAHDFESHDDITEERLYQNIFASHFGQLAIIFLWTSGNLFHVAWQGNFESWIQDPLHVRPIAHAIWDPHFGQPAVEAFTRGGAAGPVNIAYSGVYQWWYTIGLRTNEDLYTGALFLLFLSTLSLIGGWLHLQPKWKPSLSWFKNAESRLNHHLSGLFGVSSLAWTGHLVHVAIPASRGEYVRWNNFLDVLPYPQGLGPLLTGQWNLYAQNPDSSNHLFGTTQGAGTAILTLLGGFHPQTQSLWLTDIAHHHLAIAFIFLIAGHMYRTNFGIGHSIKDLLEAHTPPGGRLGRGHKGLYNTINNSIHFQLGLALASLGVITSLVAQHMYSLPSYAFIAQDFTTQAALYTHHQYIAGFIMTGAFAHGAIFFIRDYNPEQNEDNVLARMLDHKEAIISHLSWASLFLGFHTLGLYVHNDVMLAFGTPEKQILIEPIFAQWIQSAHGKTTYGFDILLSSTSGPAFNAGRTLWLPGWLNAVNENSNSLFLTIGPGDFLVHHAIALGLHTTTLILVKGALDARGSKLMPDKKDFGYSFPCDGPGRGGTCDISAWDAFYLAVFWMLNTIGWVTFYWHWKHITLWQGNVSQFNESSTYLMGWLRDYLWLNSSQLINGYNPFGMNSLSVWAWMFLFGHLVWATGFMFLISWRGYWQELIETLAWAHERTPLANLIRWRDKPVALSIVQARLVGLAHFSVGYIFTYAAFLIASTSGKFG
InterPro domains: - IPR001280: Photosystem I PsaA/PsaB (family) [1-733]
- IPR036408: Photosystem I PsaA/PsaB superfamily (homologous_superfamily) [1-734]
- IPR020586: Photosystem I PsaA/PsaB, conserved site (conserved_site) [559-568]
- IPR006244: Photosystem I PsaB (family) [1-734]
Interaction partners: - Photosystem I reaction center subunit III
- Photosystem I iron-sulfur center
- Photosystem I reaction center subunit II
- Photosystem I P700 chlorophyll a apoprotein A1
- Uncharacterized protein
- NAD
- Photosystem I reaction center subunit IX
- Photosystem I reaction center subunit VIII
- Chlorophyll a-b binding protein
- Photosystem I reaction center subunit psaK, chloroplastic
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0005488 (binding), GO:0097159 (organic cyclic compound binding), GO:1901363 (heterocyclic compound binding), GO:0003676 (nucleic acid binding), GO:0003723 (RNA binding), GO:0003729 (mRNA binding)
Biological Process (BP): GO:0008150 (biological process), GO:0050896 (response to stimulus), GO:0044419 (biological process involved in interspecies interaction between organisms), GO:0009605 (response to external stimulus), GO:0051707 (response to other organism), GO:0009607 (response to biotic stimulus), GO:0006950 (response to stress), GO:0006952 (defense response), GO:0009620 (response to fungus), GO:0098542 (defense response to other organism), GO:0043207 (response to external biotic stimulus), GO:0050832 (defense response to fungus)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0005622 (intracellular anatomical structure), GO:0043226 (organelle), GO:0005737 (cytoplasm), GO:0043229 (intracellular organelle), GO:0043227 (membrane-bounded organelle), GO:0009536 (plastid), GO:0043231 (intracellular membrane-bounded organelle)