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    • 1. 发明授权
    • Engineering plant thioesterases for altered substrate specificity
    • 工程植物硫酯酶改变底物特异性
    • US5955329A
    • 1999-09-21
    • US440845
    • 1995-05-15
    • Ling YuanKatayoon DeheshJean KridlVic Knauf
    • Ling YuanKatayoon DeheshJean KridlVic Knauf
    • C12N9/16C12N15/82C12N15/00C07H21/04
    • C12N15/8247C12N9/16
    • Methods of altering substrate specificity of plant acyl-ACP thioesterases, and engineered plant acyl-ACP thioesterases so produced are provided. The C-terminal two thirds portion of plant thioesterases is identified as desirable for such modifications. DNA sequences and constructs for expression of engineered thioesterases, as well as the novel thioesterases produced therefrom are also provided. Such DNA sequences may be used for expression of the engineered thioesterases in host cells, particularly seed cells of oilseed crop plants, for the modification of fatty acid composition. A C12 preferring plant acyl-ACP thioesterase described herein may be altered to obtain a plant thioesterase having approximately equal activity on C14 and C12 substrates. Further modification of the C12 enzyme yields a thioesterase having greater activity on C14 as compared to C12 substrates. Also provided in the instant invention are novel plant acyl-ACP thioesterase sequences from Cuphea palustris and mangosteen (Garcinia mangifera), which demonstrate desirable thioesterase activity profiles for plant genetic engineering applications.
    • 提供了改变植物酰基-ACP硫酯酶底物特异性的方法,以及如此制备的工程化植物酰基-ACP硫酯酶。 植物硫酯酶的C末端三分之二部分被鉴定为对于这种修饰是理想的。 还提供了用于表达工程化硫酯酶的DNA序列和构建体,以及由其产生的新的硫酯酶。 这样的DNA序列可用于在宿主细胞,特别是油籽作物植物的种子细胞中表达改性的硫酯酶,用于改变脂肪酸组成。 可以改变本文所述的C12优选植物酰基-ACP硫酯酶以获得对C14和C12底物具有大致相同活性的植物硫酯酶。 与C12底物相比,C12酶的进一步修饰产生对C14具有更大活性的硫酯酶。 本发明还提供了来自Cuphea palustris和山竹(Garcinia mangifera)的新型植物酰基-ACP硫酯酶序列,其显示用于植物基因工程应用的期望的硫酯酶活性谱。
    • 2. 发明授权
    • Plant acyl-ACP thioesterase sequences
    • 植物酰基-ACP硫酯酶序列
    • US5723761A
    • 1998-03-03
    • US464523
    • 1995-06-02
    • Toni A. VoelkerLing YuanJean KridlDeborah HawkinsAubrey Jones
    • Toni A. VoelkerLing YuanJean KridlDeborah HawkinsAubrey Jones
    • A01H5/00A23D9/00C11C3/00C12N5/10C12N9/16C12N15/09C12N15/55C12N15/82A01H5/10C12N5/14C12N15/29C12N15/52
    • A23D9/00C12N15/8247C12N9/16
    • This invention relates to plant thioesterases, specifically plant acyl-ACP thioesterases having substantial activity on palmitoyl-ACP substrates. DNA constructs useful for the expression of a plant palmitoyl-ACP thioesterase in a plant seed cell are described. Such constructs will contain a DNA sequence encoding the plant palmitoyl-ACP thioesterase of interest under the control of regulatory elements capable of preferentially directing the expression of the plant palmitoyl-ACP thioesterase in seed tissue, as compared with other plant tissues, when such a construct is expressed in a transgenic plant. This invention also relates to methods of using a DNA sequence encoding a plant palmitoyl-ACP thioesterase for the modification of the proportion of free fatty acids produced in a plant seed cell. Plant palmitoyl-ACP thioesterase sequences exemplified herein include Cuphea, leek, mango and elm. Transgenic plants having increased levels of C16:0 fatty acids in their seeds as the result of expression of these palmitoyl-ACP thioesterase sequences are also provided.
    • 本发明涉及植物硫酯酶,特别是具有对棕榈酰-ACP底物具有显着活性的植物酰基-ACP硫酯酶。 描述了可用于在植物种子细胞中表达植物棕榈酰-ACP硫酯酶的DNA构建体。 与其他植物组织相比,这样的构建体将含有编码植物棕榈酰-ACP硫酯酶的DNA序列,该调控元件能够优先指导植物棕榈酰-ACP硫酯酶在种子组织中的表达, 在转基因植物中表达。 本发明还涉及使用编码植物棕榈酰-ACP硫酯酶的DNA序列来修饰植物种子细胞中产生的游离脂肪酸的比例的方法。 本文例示的植物棕榈酰-ACP硫酯酶序列包括Cuphea,韭葱,芒果和榆树。 还提供了作为这些棕榈酰-ACP硫酯酶序列表达的结果,在其种子中具有增加的C16:0脂肪酸水平的转基因植物。
    • 9. 发明授权
    • Method for increasing stearate content in soybean oil
    • 增加大豆油中硬脂酸含量的方法
    • US06380462B1
    • 2002-04-30
    • US09359070
    • 1999-07-22
    • Jean Kridl
    • Jean Kridl
    • C12N1582
    • C12N15/8247C12N9/16
    • This invention relates to a method for increasing stearate as a component of total triglycerides found in soybean seed. The method generally comprises growing a soybean plant having integrated into its genome a DNA construct comprising, in the 5′ to 3′ direction of transcription, a promoter functional in a soybean plant seed cell, a DNA sequence encoding an acyl-ACP thioesterase protein having substantial activity on C18:0 acyl-ACP substrates, and a transcription termination region functional in a plant cell. The present invention also provides a soybean seed with about 33 weight percent or greater stearate as a component of total fatty acids found in seed triglycerides.
    • 本发明涉及一种增加作为大豆种子中总甘油三酯的组分的硬脂酸酯的方法。 该方法通常包括生长大豆植物,其整合到其基因组中,DNA构建体在5'至3'转录方向上包含在大豆植物种子细胞中起作用的启动子,编码酰基-ACP硫酯酶蛋白质的DNA序列,其具有 对C18:0酰基-ACP底物的活性以及在植物细胞中功能的转录终止区。 本发明还提供一种大豆种子,其具有约33重量%或更大的硬脂酸酯作为在种子甘油三酯中发现的总脂肪酸的组分。