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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Direct delivery of exogenous MHC class I molecule-binding oligopeptides to the endoplasmic reticulum of viable cells
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Direct delivery of exogenous MHC class I molecule-binding oligopeptides to the endoplasmic reticulum of viable cells

机译:直接将外源性MHC I类分子结合寡肽直接递送至活细胞的内质网

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摘要

After brief incubation of cells with fluores- cein-conjugated peptides that bind major histocompatibility complex (MHC) class I molecules, peptides were detected within the endoplasmic reticulum (ER) by microscopy or by binding to radiolabeled class I molecules. ER delivery of a nonfluorescent peptide was demonstrated using a mAb highly specific for the peptide-class I molecule complex. ER local- ization of peptides: (i) required expression of appropriate class I molecules in the ER but not on the cell surface, (ii) was diminished by expression of TAP, the MHC-encoded cytosol to ER peptide transporter, and (iii) was blocked by pinocytosis inhibitors but not by brefeldin A.
机译:在将细胞与结合了主要组织相容性复合物(MHC)I类分子的荧光素结合肽短暂孵育后,通过显微镜检查或通过与放射性标记的I类分子结合,在内质网(ER)中检测到了肽。使用对I类肽分子复合物高度特异的mAb证明了非荧光肽的ER递送。肽的ER定位:(i)要求在ER中表达适当的I类分子,但不在细胞表面表达;(ii)通过TAP(MHC编码的ER肽转运蛋白的胞质溶胶)的表达而减少;和(iii )被pinocytosis抑制剂阻断,但未被布雷菲德菌素A阻断。

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