Structural mechanism of tapasin-mediated MHC-I peptide loading in antigen presentation.

Structural mechanism of tapasin-mediated MHC-I peptide loading in antigen presentation.
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DOI:
10.1038/s41467-022-33153-8
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发表时间:
2022-09-17
影响因子:
16.6
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中科院分区:
综合性期刊1区
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通过肽负载复合物中的催化伴侣tapasin将肽负载于MHC-I分子,在抗原呈递和免疫识别中起关键作用。由于缺乏有关塔帕辛-MHC-I的详细结构信息,机制洞察受到阻碍。我们在这里提出了与MHC-I分子HLA-B*44:05复合的人tapasin的晶体结构,以及与两种抗tapasin抗体中的每一种。HLA-B*44:05的Tapasin稳定的肽接受状态的特征在于肽结合沟的扭曲和β2-微球蛋白相互作用的不稳定,导致肽的释放。Tapasin、HLA-B*44:05和β2-微球蛋白的膜近端Ig样结构域的移动伴随向肽接受状态的转变。这种晶体结构的集合一起提供了对塔帕辛介导的肽交换的独特机制的见解。催化伴侣tapasin协助肽装载到MHC-I分子上用于抗原呈递和免疫识别。在这里,作者提出了晶体结构,提供了对tapasin介导的肽交换的分子机制的见解。
Loading of MHC-I molecules with peptide by the catalytic chaperone tapasin in the peptide loading complex plays a critical role in antigen presentation and immune recognition. Mechanistic insight has been hampered by the lack of detailed structural information concerning tapasin–MHC-I. We present here crystal structures of human tapasin complexed with the MHC-I molecule HLA-B*44:05, and with each of two anti-tapasin antibodies. The tapasin-stabilized peptide-receptive state of HLA-B*44:05 is characterized by distortion of the peptide binding groove and destabilization of the β2-microglobulin interaction, leading to release of peptide. Movements of the membrane proximal Ig-like domains of tapasin, HLA-B*44:05, and β2-microglobulin accompany the transition to a peptide-receptive state. Together this ensemble of crystal structures provides insights into a distinct mechanism of tapasin-mediated peptide exchange. The catalytic chaperone tapasin assists peptide loading onto MHC-I molecules for antigen presentation and immune recognition. Here, the authors present crystal structures that provide insights into the molecular mechanism of tapasin-mediated peptide exchange.
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