一种新的gp130结合分子的序列分析和真核表达

The cloning and expression of a novel gp130 associated molecule

目的对以ＧＳＴ－ｇｐ１３０融合蛋白为探针，筛选人胎盘ｃＤＮＡ文库而得到的一个分子（ＧＡＭ，ｇｐ１３０ａｓｓｏｃｉａｔｅｄｍｏｌｅｃｕｌｅ）ｃＤＮＡ序列进行测定并做真核表达。方法进行噬菌体制备及克隆测序，并做同源性检索和构型、亲水性分析，ＣＯＳ细胞转染和３５Ｓ－蛋氨酸标记。结果所得ＧＡＭ分子与另一已克隆成功但功能还不清楚的称为ｈＡＥＳ－１的分子同源性达９７．７％。此外，ＧＡＭｃＤＮＡ还与果蝇ｅｎｈａｎｃｅｒｏｆｓｐｌｉｔ基因相关的分子有较高同源性。ＧＡＭ分子具有一个５８８个核苷酸的开放读框，编码１９６个氨基酸。将ＧＡＭ分子ｃＤＮＡ转染ＣＯＳ细胞后，细胞裂解液电泳可见一分子量约为２４×１０３的表达带，与预期的分子量相符合。结论ＧＡＭ分子与ｈＡＥＳ－１分子在开放读框内仅相差一个氨基酸（且不排除测序的个别错误），其分子量也与已报道的ｈＡＥＳ－１分子量相同，故认为两者很可能是同一分子。

GAM molecule was taken out from human placenta cDNA library by using GSTgp130 fusion protein as a probe.In this paper,the authors sequenced GAM cDNA,and found that it was most probably the same with another already cloned molecule,named hAES1, with yet unknown function. GAM cDNA sequence showed high homology with Drosophila enhancer of split gene,which was found to be related to neurogenesis and important in signal transduction.GAM cDNA showed an open reading frame of 588 nucleotides coding for an 196 amino acids protein .When GAM cDNA was transfected into COS cells,it appears as an 24kDa expressing band.which was in accordance with the deduced molecular weight.