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ABA4

Gene
ABA4
Protein
Protein ABA DEFICIENT 4, chloroplastic
Organism
Arabidopsis thaliana
Length
220 amino acids
Function
Required for neoxanthin biosynthesis, an intermediary step in abscisic acid (ABA) biosynthesis. Probably not involved directly in the enzymatic conversion of violaxanthin to neoxanthin. Cannot convert violaxanthin to neoxanthin in vitro. Required for ABA biosynthesis in response to drought stress (PubMed:17470058). Required for neoxanthin biosynthesis which is involved in photoprotection of photosystem II (PSII). Neoxanthin acts as an antioxidant within the photosystem PSII supercomplex (PubMed:17351115).
Mass
24.624 kDa
Sequence
MGFSSFISQPLSSSLSVMKRNVSAKRSELCLDSSKIRLDHRWSFIGGSRISVQSNSYTVVHKKFSGVRASWLTTTQIASSVFAVGTTAVLPFYTLMVVAPKAEITKKCMESSVPYIILGVLYVYLLYISWTPETLKYMFSSKYMLPELSGIAKMFSSEMTLASAWIHLLVVDLFAARQVYNDGLENQIETRHSVSLCLLFCPVGIVSHFVTKAIINNQYK