Identification of a new family of human epithelial protein kinases containing two leucine/isoleucine-zipper domains.

Identification of a new family of human epithelial protein kinases containing two leucine/isoleucine-zipper domains.
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鉴定含有两个亮氨酸/异亮氨酸拉链结构域的新人类上皮蛋白激酶家族。

DOI:
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发表时间:
1993
期刊:
European Journal of Biochemistry
影响因子:
--
通讯作者:
Theonne de Kretser
Theonne de Kretser
中科院分区:
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文献类型:
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作者:
D. Dorow;Lisa Devereux;Erin Dietzsch;Theonne de Kretser

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用聚合酶链反应研究人上皮肿瘤细胞中表达的mRNA,鉴定了一个新的蛋白激酶家族的成员。该激酶的催化结构域与Tyr特异性和Ser/Thr特异性激酶类具有氨基酸序列相似性。代表这个新家族的两个成员的克隆已从人结肠上皮cDNA文库中分离并测序。这些克隆的预测的氨基酸序列表明,除了它们的激酶催化结构域的不寻常的性质,它们包含两个Leu/Ile拉链基序和一个基本序列,靠近它们的C-末端。由于它们具有与来自两个不同功能组的蛋白质相关的结构域,这些激酶被命名为混合谱系激酶(MLK)1和2。已发现MLK 1的mRNA在结肠、乳腺和食管来源的上皮肿瘤细胞系中表达。MLK 1基因定位于人类染色体14q24.3-31。
Using the polymerase chain reaction to study mRNA expressed in human epithelial tumor cells, a member of a new family of protein kinases was identified. The catalytic domain of this kinase has amino-acid-sequence similarity to both the Tyr-specific and the Ser/Thr-specific kinase classes. Clones representing two members of this new family have been isolated from a human colonic epithelial cDNA library and sequenced. The predicted amino-acid sequences of these clones reveal that, in addition to the unusual nature of their kinase catalytic domains, they contain two Leu/Ile-zipper motifs and a basic sequence, near their C-termini. As they possess domains associated with proteins from two distinct functional groups, these kinases have been named mixed-lineage kinases (MLK) 1 and 2. mRNA from MLK1 has been found to be expressed in epithelial tumor cell lines of colonic, breast and esophageal origin. The MLK1 gene has been mapped to human chromosome 14q24.3-31.
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