Function
Involved in providing solanesyl diphosphate for plastoquinone-9 (PQ-9) formation in plastids (PubMed:12437513, PubMed:23913686, PubMed:26039552). Catalyzes the elongation of the prenyl side chain of PQ-9 in plastids (PubMed:23913686, PubMed:26039552). Contributes to the biosynthesis of plastochromanol-8 (PC-8) in plastids (PubMed:23913686, PubMed:26039552). Does not contribute to the synthesis of tocopherol or ubiquinone (PubMed:23913686). PQ-9 and PC-8 are lipophylic antioxidant that act as protectant against photooxidative stress under high light stress conditions (PubMed:23913686, PubMed:26039552, PubMed:29901834). Prefers geranylgeranyl diphosphate to farnesyl diphosphate as substrate (PubMed:12437513). No activity with geranyl diphosphate or dimethylallyl diphosphate as substrate (PubMed:12437513).
Sequence
MMTSCRNIDLGTMMMACGCGRRQFPSLAKTVCKFTSSNRSYGGLVGSCKAVPTKSKEISLLNGIGQSQTVSFDLKQESKQPISLVTLFELVAVDLQTLNDNLLSIVGAENPVLISAAEQIFGAGGKRMRPGLVFLVSHATAELAGLKELTTEHRRLAEIIEMIHTASLIHDDVLDESDMRRGKETVHELFGTRVAVLAGDFMFAQASWYLANLENLEVIKLISQVIKDFASGEIKQASSLFDCDTKLDEYLLKSFYKTASLVAASTKGAAIFSRVEPDVTEQMYEFGKNLGLSFQIVDDILDFTQSTEQLGKPAGSDLAKGNLTAPVIFALEREPRLREIIESEFCEAGSLEEAIEAVTKGGGIKRAQELAREKADDAIKNLQCLPRSGFRSALEDMVLYNLERID