SummaryPetunia flower petals emit large amounts of isoeugenol, which has been shown to be synthesized by isoeugenol synthase (PhIGS1) from an ester of coniferyl alcohol, hypothesized to be coniferyl acetate. This paper describes the identification and characterization of a novel petunia gene encoding an enzyme belonging to the BAHD acyltransferase family whose expression correlates with isoeugenol biosynthesis. RNAi suppression of this gene results in inhibition of isoeugenol biosynthesis. Biochemical characterization of the protein encoded by this gene showed that it has acetyltransferase activity and is most efficient with coniferyl alcohol among the alcohol substrates tested. Overall, these data support the conclusion that coniferyl acetate is the substrate of isoeugenol synthase.
摘要矮牵牛花瓣能释放出大量异丁香酚,异丁香酚由异丁香酚合成酶(PhIGS1)从针叶醇的酯类合成,该酯类被推测为针叶乙酸酯。本文描述了一种新型矮牵牛花基因的鉴定和特征描述,该基因编码一种属于 BAHD酰基转移酶家族的酶,其表达与异丁香酚的生物合成有关。RNAi 抑制该基因可抑制异丁香酚的生物合成。对该基因编码的蛋白质进行的生化鉴定表明,它具有乙酰转移酶活性,在测试的醇类底物中,它对针叶醇的活性最高。总之,这些数据支持针叶醇乙酸酯是异丁香酚合成酶底物的结论。