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Cloning and Sequencing of the cDNA Encoding the Rubber Elongation Factor of Hevea brasiliensis

机译:巴西橡胶树橡胶延伸因子cDNA的克隆与序列分析

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摘要

In Hevea brasiliensis, the rubber particle in the laticiferous vessel is the site of rubber (cis-1-4-polyisoprene) biosynthesis. A 14 kilodalton protein, rubber elongation factor (REF), is associated with the rubber particle in a ratio of one REF to one rubber molecule (Dennis M, Henzel W, Bell J, Kohr W, Light D [1989] J Biol Chem 264: 18618-18628; Dennis M, Light D [1989] J Biol Chem 264: 18608-18617). To obtain more information concerning the function of REF and its synthesis and assembly in the rubber particle, we isolated cDNA clones encoding REF. We used antibodies to REF to screen a Hevea leaf γgt11 cDNA expression library and obtained several positive clones. Sequence analysis of the REF cDNA clones showed that the REF mRNA contains 121 nucleotides of 5′-nontranslated sequences and a 205 nucleotide 3′-nontranslated region. The open reading frame encodes the entire 14 kilodalton REF protein without any extra amino acids (Dennis M, Henzel W, Bell J, Kohr W, Light D [1989] J Biol Chem 264: 18618-18628). The REF cDNA was subcloned in pGEM-3Z/-4Z and expressed in vitro. The translation product is a 14 kilodalton protein that can be immunoprecipitated with antibodies to REF. Addition of microsomal membranes to the in vitro translation product did not alter the mobility of the REF protein. This, and the sequence data, indicate that REF is not made as a preprotein. Our results suggest that REF is synthesized on free polysomes in the laticifer cytoplasm and that assembly of the rubber particles is likely to occur in the cytosol.
机译:在巴西橡胶树中,乳胶化容器中的橡胶颗粒是橡胶(顺式1-4-聚异戊二烯)生物合成的场所。 14道尔顿蛋白质,即橡胶伸长因子(REF),以一种REF与一个橡胶分子的比例与橡胶颗粒相关联(Dennis M,Henzel W,Bell J,Korr W,Light D [1989] J Biol Chem 264 :18618-18628; Dennis M,Light D [1989] J Biol Chem 264:18608-18617)。为了获得有关REF的功能及其在橡胶颗粒中的合成和组装的更多信息,我们分离了编码REF的cDNA克隆。我们使用了针对REF的抗体来筛选橡胶树叶γgt11cDNA表达文库,并获得了几个阳性克隆。 REF cDNA克隆的序列分析表明,REF mRNA包含5'非翻译序列的121个核苷酸和3'非翻译区域的205个核苷酸。开放阅读框编码没有任何额外氨基酸的整个14千道尔顿的REF蛋白(Dennis M,Henzel W,Bell J,Korr W,Light D [1989] J Biol Chem 264:18618-18628)。 REF cDNA被亚克隆到pGEM-3Z / -4Z中并在体外表达。翻译产物是一种14千道尔顿蛋白,可以用REF抗体进行免疫沉淀。在体外翻译产物中加入微粒体膜不会改变REF蛋白的迁移率。这和序列数据表明REF不是作为前蛋白制成的。我们的结果表明,REF是在乳胶质细胞质中的游离多核糖体上合成的,橡胶颗粒的组装很可能在细胞质中发生。

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