apoprotein

General Information (Source: NCBI Gene,UniProt)

Text mining Term apoprotein
UniProt ID PSAB_HELAN
Name PSI-B
Photosystem I P700 chlorophyll a apoprotein A2
PsaB
Gene Names psaB
Taxonomy Helianthus annuus

General annotation

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.

Gene Ontology

GO:0015979 photosynthesis BP
GO:0018298 protein-chromophore linkage BP
GO:0051539 4 iron, 4 sulfur cluster binding MF
GO:0006810 transport BP
GO:0022900 electron transport chain BP
GO:0009535 chloroplast thylakoid membrane CC
GO:0016168 chlorophyll binding MF
GO:0046872 metal ion binding MF
GO:0016021 integral to membrane CC
GO:0009522 photosystem I CC

Sequence

>gi|122179578|sp|Q1KXW0.1|PSAB_HELAN RecName: Full=Photosystem I P700 chlorophyll a apoprotein A2; AltName: Full=PSI-B; AltName: Full=PsaB
MALRFPRFSQGLAQDPTTRRIWFGIATAHDFESHDDITEERLYQNIFASHFGQLAIIFLWTSGNLFHVAW
QGNFESWVQDPLHVRPIAHAIWDPHFGQPAVEAFTRGGAPGPVNIAYSGVYQWWYTIGLRTNEDLYTGAL
FLLFISAISLIAGWLHLQPKWKPSVSWFKNAESRLNHHLSGLFGVSSLAWTGHLVHVAIPASRGESVRWN
NFLDVLPHPQGLGPLFTGQWNLYAQNPDSSSHLFGTSQGAGTAILTLLGGFHPQTQSLWLTDMAHHHLAI
AFIFLIAGHMYRTNFGIGHSMKDLLDAHIPPGGRLGRGHKGLYDTINNSIHFQLGLALASLGVITSLVAQ
HMYSLPAYAFIAQDFTTQAALYTHHQYIAGFIMTGAFAHGAIFFIRDYNPEQNEDNVLARMLEHKEAIIS
HLSWASLFLGFHTLGLYVHNDVMLAFGTPEKQILIEPIFAQWIQSAHGKTSYGFDILLSSTSGPAFNAGR
SIWLPGWLNAVNENSNSLFLTIGPGDFLVHHAIALGLHTTTLILVKGALDARGSKLMPDKKDFGYSFPCD
GPGRGGTCDISAWDAFYLAVFWMLNTIGWVTFYWHWKHITLWQGNVSQFNESSTYLMGWLRDYLWLNSSQ
LINGYNPFGMNSLSVWAWMFLFGHLVWATGFMFLISWRGYWQELIETLAWAHERTPLANLIRWRDKPVAL
SIVQARLVGLAHFSVGYIFTYAAFLIASTSGKFG

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Database Cross Reference

Ensembl Gene
UniGene
PDB
RefSeq YP_588116.1
Pfam PF00223