八氢番茄红素脱氢酶的研究进展

Advances in phytoene dehydrogenase——A review

类胡萝卜素是一类超过700种的萜烯基团类不饱和化合物的总称,根据结构可分为胡萝卜素族和叶黄素族,具有较高的营养价值。八氢番茄红素脱氢酶是类胡萝卜素生物合成途径中的首要限速酶,它参与催化无色的八氢番茄红素转变成有色类胡萝卜素,发挥着中心调控作用。不同生物源的八氢番茄红素脱氢酶在功能上呈现多样性,在大多数蓝细菌,藻类和高等植物的类胡萝卜素生物合成途径中,由Crt P,Crt Q和异构酶Crt H或PDS,ZDS和异构酶Z-ISO、Crt ISO共同参与番茄红素的形成,而在大多数微生物中只有Crt I-type一种酶来完成八氢番茄红素的脱氢反应,且根据脱氢步骤的不同分别可生成链孢红素、番茄红素或脱氢番茄红素。本文阐述了不同生物源八氢番茄红素脱氢酶的基因分离与鉴定,功能多样性及表达调控机制等最新研究进展,并进行了进化分析,为八氢番茄红素脱氢酶的深入研究及利用基因工程策略生产类胡萝卜素的应用提供重要信息。

Carotenoids, as a group of over 700 valuable unsaturated terpene compounds classified as carotene and xanthophyll family, are endowed with powerful nutritional value. Phytoene dehydrogenase is the key rate-limiting enzyme in carotenoids biosynthesis pathway, involved in catalyzing the conversion from colorless hydrocarbon phytoene to other pigmented carotenoids, and plays an essential central regulation role. The function of phytoene dehydrogenases from different organisms exist diversity. Crt P, Crt Q and isomerase Crt H are essential for the formation of lycopene in most Cyanobacteria, whereas PDS, ZDS and isomerase Z-ISO, Crt ISO are in charge of producing lycopene in most algae and plants. Nevertheless, there is only one Crt I-type for the formation of neurosporene, lycopene or dehydrolycopene in most bacteria and fungi. In this review, isolation, characterization,functional diversity, transcription regulatory mechanisms and phylogenetic analysis of phytoene dehydrogenase from different organisms are illustrated. This paper will provide insights into phytoene dehydrogenase and may facilitate the optimization of carotenoids production in genetic engineering strategy.