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首页> 外文期刊>Journal of bacteriology >Specificity and Topology of the Escherichia coli Xanthosine Permease, a Representative of the NHS Subfamily of the Major Facilitator Superfamily
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Specificity and Topology of the Escherichia coli Xanthosine Permease, a Representative of the NHS Subfamily of the Major Facilitator Superfamily

机译:大肠杆菌黄嘌呤通透酶(主要促进者超家族的NHS子家族的代表)的特异性和拓扑结构

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The specificity of XapB permease was compared with that of the known nucleoside transporters NupG and NupC. XapB-mediated xanthosine uptake is abolished by 2,4-dinitrophenol and exhibits saturation kinetics with an apparent Km of 136 μM. A 12-transmembrane-segment model was confirmed by translational fusions to alkaline phosphatase and the α fragment of β-galactosidase.
机译:将XapB渗透酶的特异性与已知的核苷转运蛋白NupG和NupC的特异性进行了比较。 XapB介导的黄嘌呤核苷的吸收被2,4-二硝基苯酚所消除,并表现出饱和动力学,其表观 K m 为136μM。通过与碱性磷酸酶和β-半乳糖苷酶的α片段的翻译融合,证实了12跨膜段模型。

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