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Immune recognition of a human renal cancer antigen through post-translational protein splicing

机译:通过翻译后蛋白剪接对人肾癌抗原的免疫识别

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摘要

Cytotoxic T lymphocytes (CTLs) detect and destroy cells displaying class I molecules of the major histocompatibility complex (MHC) that present oligopeptides derived from aberrant self or foreign proteins. Most class I peptide ligands are created from proteins that are degraded by proteasomes and transported, by the transporter associated with antigen processing, from the cytosol into the endoplasmic reticulum, where peptides bind MHC class I molecules and are conveyed to the cell surface. C2 CTLs, cloned from human CTLs infiltrating a renal cell carcinoma, kill cancer cells overexpressing fibroblast growth factor-5 (FGF-5). Here we show that C2 cells recognize human leukocyte antigen-A3 MHC class I molecules presenting a nine-residue FGF-5 peptide generated by protein splicing. This process, previously described strictly in plants and unicellular organisms, entails post-translational excision of a polypeptide segment followed by ligation of the newly liberated carboxy-terminal and amino-terminal residues. The occurrence of protein splicing in vertebrates has important implications for the complexity of the vertebrate proteome and for the immune recognition of self and foreign peptides.
机译:细胞毒性T淋巴细胞(CTL)检测并破坏显示主要组织相容性复合体(MHC)的I类分子的细胞,这些分子呈现出衍生自异常自身或外来蛋白质的寡肽。大多数I类肽配体是由被蛋白酶体降解并通过与抗原加工相关的转运蛋白从胞质溶胶转运到内质网的蛋白质产生的,在那里肽与MHC I类分子结合并被转运至细胞表面。从渗入肾细胞癌的人CTL中克隆的C2 CTL可以杀死过度表达成纤维细胞生长因子5(FGF-5)的癌细胞。在这里,我们显示C2细胞识别人白细胞抗原A3 MHC I类分子,该分子呈现由蛋白质剪接产生的九个残基FGF-5肽。先前在植物和单细胞生物中严格描述过该过程,需要翻译后切除多肽片段,然后连接新释放的羧基末端和氨基末端残基。脊椎动物中蛋白质剪接的出现对于脊椎动物蛋白质组的复杂性以及自身和外来肽的免疫识别具有重要意义。

著录项

  • 来源
    《Nature》 |2004年第6971期|p.252-256|共5页
  • 作者单位

    Surgery Branch, National Cancer Institute, National Institutes of Health, 9000 Rockville Pike, Building10, Room 2B42, Bethesda, Maryland 20892, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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