人醛脱氢酶1和2基因的克隆。
文章的细节
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引用
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徐立林,谷田,藤吉,仓立,吉田
人醛脱氢酶1和2基因的克隆。
中国科学院学报(自然科学版)1985年6月;82(11):3771-5。
- PubMed ID
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2987944 (PubMed视图]
- 摘要
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从噬菌体lambda gt11构建的人肝脏cDNA文库中分离到编码人胞质醛脱氢酶(ALDH1)和线粒体醛脱氢酶(ALDH2)的部分cDNA克隆。用兔抗ALDH1和ALDH2抗体筛选表达文库。用合成的与ALDH1和ALDH2肽段序列兼容的混合寡核苷酸筛选得到的阳性克隆。其中一个ALDH1阳性无性系插入1.6千碱基对(kbp)。该插入物编码340个氨基酸残基,有一个3'长538 bp的非编码区和一个poly(a)片段。从cDNA序列推断出的氨基酸序列与报道的人类ALDH1的氨基酸序列一致[Hempel, J., von Bahr-Lindstrom, H. & Jornvall, H. (1984) Eur。[J.生物化学,141,21 -35],除了在先前的氨基酸序列研究中发现缬氨酸在161位是异亮氨酸以外。由于ALDH2的氨基酸序列未知,从人ALDH2中分离到33个胰蛋白酶肽并进行了测序。根据得到的氨基酸序列数据,制备了混合寡核苷酸探针。两个阳性克隆ALDH2-21和ALDH2-36含有相同的1.2 kbp插入。 Another clone, lambda ALDH2-22, contained an insert of 1.3 kbp. These two inserts contained an overlap region of 0.9 kbp. The combined cDNA contained a sequence that encodes 399 amino acid residues, a chain-termination codon, a 3' untranslated region of 403 bp, and a poly(A) segment. The deduced amino acid sequence was compatible with the amino acid sequences of the tryptic peptides. The degree of homology between human ALDH1 and ALDH2 is 66% for the coding regions of their cDNAs and 69% at the protein level. No significant homology was found in their 3' untranslated regions.