首页> 外文期刊>Infection and immunity >A nonamer peptide derived from Listeria monocytogenes metalloprotease is presented to cytolytic T lymphocytes.
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A nonamer peptide derived from Listeria monocytogenes metalloprotease is presented to cytolytic T lymphocytes.

机译:源自单核细胞增生李斯特氏菌金属蛋白酶的九聚体肽被呈递给溶细胞性T淋巴细胞。

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Listeria monocytogenes is an intracellular bacterium that secretes proteins into the cytosol of infected macrophages. Major histocompatibility complex (MHC) class I molecules bind peptides that are generated by the degradation of bacterial proteins and present them to cytolytic T lymphocytes (CTL). In this study we have investigated CTL responses in L. monocytogenes-immunized mice to peptides that (i) derive from the L. monocytogenes proteins phosphatidylinositol-specific phospholipase C, lecithinase (most active on phosphatidylcholine), metalloprotease (Mpl), PrfA, and the ORF-A product and (ii) conform to the binding motif of the H2-Kd MHC class I molecule. We identified a nonamer peptide, Mpl 84-92, that is presented to L. monocytogenes-specific CTL by H2-Kd MHC class I molecules. Unlike other motif-conforming peptides derived from the secreted Mpl of L. monocytogenes, Mpl 84-92 is bound with high affinity by H2-Kd. Mpl 84-92 is the fourth L. monocytogenes-derived peptide found to be presented to CTL by the H2-Kd molecule during infection and demonstrates the importance of high-affinity interactions between antigenic peptides and MHC class I molecules for CTL priming.
机译:单核细胞增生李斯特菌是一种细胞内细菌,可将蛋白质分泌到被感染的巨噬细胞的细胞质中。主要的组织相容性复合体(MHC)I类分子结合由细菌蛋白质降解产生的肽,并将其呈递给溶细胞性T淋巴细胞(CTL)。在这项研究中,我们研究了单核细胞增生李斯特氏菌免疫小鼠中CTL对以下肽的反应:(i)单核细胞增生李斯特氏菌蛋白磷脂酰肌醇特异性磷脂酶C,卵磷脂酶(对磷脂酰胆碱最活跃),金属蛋白酶(Mpl),PrfA和ORF-A产物和(ii)符合H2-Kd MHC I类分子的结合基序。我们鉴定了九聚体肽,Mpl 84-92,由H2-Kd MHC I类分子呈递给单核细胞增生李斯特氏菌特异性CTL。与衍生自分泌的单核细胞增生李斯特菌Mpl的其他基序一致肽不同,Mpl 84-92被H2-Kd高亲和力结合。 Mpl 84-92是在感染过程中被H2-Kd分子呈递给CTL的第四种单核细胞增生李斯特氏菌衍生肽,证明了抗原肽和I类MHC分子之间高亲和力相互作用对于CTL启动的重要性。

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