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The sng2 mutant of Arabidopsis is defective in the gene encoding the serine carboxypeptidase-like protein sinapoylglucose:choline sinapoyltransferase.

Plant J.2001 Oct;28(1):83-94
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摘要


Serine carboxypeptidase-like (SCPL) proteins have traditionally been assigned roles in the hydrolytic processing of proteins; however, several SCPL proteins have recently been identified as catalysts in transacylation reactions of plant secondary metabolism. The novel functions of these enzymes suggest a catalytic diversity for plant SCPL proteins that extends beyond simple hydrolysis reactions. Characterization of the Arabidopsis sng2 (sinapoylglucose accumulator 2) mutant has identified another SCPL protein involved in plant secondary metabolism. The sng2 mutant was isolated by screening seed extracts for altered levels of sinapate esters, a group of phenylpropanoid compounds found in Arabidopsis and some other members of the Brassicaceae. Homozygous sng2 seeds accumulate sinapoylglucose instead of sinapoylcholine, and have increased levels of choline and decreased activity of the enzyme sinapoylglucose:choline sinapoyltransferase (SCT). Cloning of the SNG2 gene by a combination of map-based and candidate gene approaches demonstrates that SCT is another member of the growing class of SCPL acyltransferases involved in plant secondary metabolism.

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