中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
胆固醇杂质EPA | lathosterol | 80-99-9 | C27H46O | 386.662 |
(3S,5S,10S,13R,14R,17R)-10,13-二甲基-17-[(2R)-6-甲基庚-5-烯-2-基]-2,3,4,5,6,7,11,12,14,15,16,17-十二氢-1H-环戊并[a]菲-3-醇 | zymosterol | 128-33-6 | C27H44O | 384.646 |
—— | 3β-(tetrahydro-2H-pyran-2-yloxy)chol-5-en-24-ol | 66414-43-5 | C29H48O3 | 444.698 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
(25S)-δ7-大发酸 | dafachronic acid A | 949004-12-0 | C27H42O3 | 414.629 |
—— | (25R)-3-keto-5α-cholest-7-en-26-oic acid | 949004-11-9 | C27H42O3 | 414.629 |
(3S,9R,10R,13S,14R,17R)-10,13-二甲基-17-[(2R)-6-甲基庚-5-烯-2-基]-2,3,4,9,11,12,14,15,16,17-十氢-1H-环戊并[a]菲-3-醇 | cholesta-5,7,24-triene-3β-ol | 1715-86-2 | C27H42O | 382.63 |
—— | 5alpha-Cholesta-7,24-dien-3-one | 1593141-38-8 | C27H42O | 382.63 |
Since the isolation and characterization of dwarf1-1 (dwf1-1) from a T-DNA insertion mutant population, phenotypically similar mutants, including deetiolated2 (det2),constitutive photomorphogenesis and dwarfism(cpd), brassinosteroid insensitive1 (bri1), and dwf4, have been reported to be defective in either the biosynthesis or the perception of brassinosteroids. We present further characterization ofdwf1-1 and additional dwf1 alleles. Feeding tests with brassinosteroid-biosynthetic intermediates revealed that dwf1 can be rescued by 22α-hydroxycampesterol and downstream intermediates in the brassinosteroid pathway. Analysis of the endogenous levels of brassinosteroid intermediates showed that 24-methylenecholesterol in dwf1 accumulates to 12 times the level of the wild type, whereas the level of campesterol is greatly diminished, indicating that the defective step is in C-24 reduction. Furthermore, the deduced amino acid sequence of DWF1 shows significant similarity to a flavin adenine dinucleotide-binding domain conserved in various oxidoreductases, suggesting an enzymatic role for DWF1. In support of this, 7 of 10 dwf1 mutations directly affected the flavin adenine dinucleotide-binding domain. Our molecular characterization of dwf1 alleles, together with our biochemical data, suggest that the biosynthetic defect indwf1 results in reduced synthesis of bioactive brassinosteroids, causing dwarfism.
自从从T-DNA插入突变体群体中分离和表征了矮生1-1(dwf1-1)以来,类似表型的突变体,包括去叶绿醇2(det2),成熟光形态和侏儒(cpd),油菜素内酯不敏感1(bri1)和dwf4,已被报道存在生物合成或油菜素内酯感受的缺陷。我们进一步表征了dwf1-1和其他dwf1等位基因。用油菜素内酯生物合成中间体进行喂食实验表明,dwf1可以通过22α-羟基茎草甾醇和油菜素内酯途径下的中间体来拯救。对内源性油菜素内酯中间体水平的分析表明,dwf1中的24-亚甲基胆固醇累积到野生型水平的12倍,而茎草甾醇的水平大大降低,表明缺陷步骤在C-24还原中。此外,DWF1的推导氨基酸序列显示与各种氧化还原酶中保守的黄素腺嘌呤二核苷酸结合域具有显著的相似性,表明DWF1具有酶促作用。支持这一点的是,10个dwf1突变中的7个直接影响黄素腺嘌呤二核苷酸结合域。我们对dwf1等位基因的分子特征化,以及我们的生化数据,表明dwf1中的生物合成缺陷导致生物活性油菜素内酯的合成减少,从而引起侏儒症。