植物中棉子糖系列寡糖代谢及其调控关键酶研究进展

棉子糖系列寡糖代谢与植物生长发育、逆境胁迫、种子耐贮性及脱水耐性等关系密切.棉子糖系列寡糖的合成从棉子糖的合成开始,由半乳糖苷肌醇上的半乳糖基的转移依次生成棉子糖、水苏糖、毛蕊花糖等.寡糖代谢是一个复杂的调控体系,其中肌醇-1-磷酸合成酶、肌醇半乳糖苷合成酶、蔗糖合成酶、棉子糖合成酶、水苏糖合成酶和毛蕊花糖合成酶等参与了棉子糖系列寡糖的生物合成过程.本文对植物中棉子糖系列寡糖的代谢及其重要调控酶的特性、功能及分子生物学研究进展进行综述.

Advance in Raffinose Family Oligosaccharides Metabolism and the Key Enzymes in Plants

Raffinose family oligosaccharides(RFOS) metabolism is closely related with plant development,stress,acquisition of desiccation tolerance in seeds,seeds viability and so on.The biosynthesis of raffinose,the first member of the series,proceeds by transfer a galactosyl unit to suc1rose.Then stachyose and verbascose,the next higher RFOS,are synthesized.In plant,the enzymes of RFO,such as galactinol synthase,myo inositol-1-phosphate synthase,raffinose synthase and stachyose synthase,are linked with the RFO pathway.This review focuses on the RFO metabolism and biochemistry and molecular biology of the key enzymes,and provides research progress in study on raffinose family oligosaccharides.