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Identifying functionally important conformational changes in proteins: Activation of the yeast α-factor receptor Ste2p

机译:鉴定蛋白质中功能上重要的构象变化:酵母α-因子受体Ste2p的激活

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摘要

We have developed a procedure in which disulfide cross-links are used to identify regions of proteins that undergo functionally important intramolecular motion. The approach was applied to the identification of disulfide bonds that stabilize the active state of the yeast α-mating pheromone receptor Ste2p, a member of the superfamily of G protein-coupled receptors. Cysteine residues were introduced at random positions in targeted regions of a starting allele of Ste2p that completely lacks cysteines. Libraries of mutated receptors were then screened for alleles that exhibit constitutive signaling. Two strongly activated alleles were recovered containing cysteine residues in transmembrane (TM) segments 5 and 6. Constitutive activity of these alleles was dependent on the presence of both introduced cysteines and was sensitive to reducing agent. Cross-linked peptides derived from the mutant receptors were detected by immunoblotting. Additional sites of cross-linking between TM segments 5 and 6 that did not lead to constitutive activation were also identified. These results indicate that relative motion of the TM segments 5 and 6 in the extracellular half of the membrane is sufficient to activate the receptor and that TM segment 6, but not TM segment 5, exhibits rotational mobility that is not associated with receptor activation.
机译:我们已经开发出一种程序,其中二硫键被用于识别发生功能上重要的分子内运动的蛋白质区域。该方法已应用于鉴定可稳定酵母α-交配信息素受体Ste2p(G蛋白偶联受体超家族成员)的活性状态的二硫键。半胱氨酸残基在完全缺乏半胱氨酸的Ste2p起始等位基因的目标区域的随机位置引入。然后筛选突变受体的文库中表现出组成型信号转导的等位基因。回收了两个强活化的等位基因,它们在跨膜(TM)区段5和6中含有半胱氨酸残基。这些等位基因的组成活性取决于两个引入的半胱氨酸的存在,并且对还原剂敏感。通过免疫印迹检测衍生自突变受体的交联肽。还确定了TM段5和6之间未导致组成性激活的其他交联位点。这些结果表明,在膜的细胞外半部中TM片段5和6的相对运动足以激活受体,并且TM片段6而非TM片段5显示出与受体激活无关的旋转运动性。

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