Stoichiometry of HLA class II-invariant chain oligomers.

Stoichiometry of HLA class II-invariant chain oligomers.
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DOI:
10.1371/journal.pone.0017257
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发表时间:
2011-02-22
期刊:
影响因子:
3.7
通讯作者:
Springer S
Springer S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Koch N;Zacharias M;König A;Temme S;Neumann J;Springer S

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HLA基因复合体编码三种II类同型,DR、DQ和DP。HLA II类分子是肽受体,提供抗原供T淋巴细胞识别。在抗原提呈细胞中,匹配的α和β亚基与异源二聚体的组装是由不变链陪同的(Ii)。Ii类异源二聚体形成具有三个结合位点的三聚体。目前的II类和II类结构模型表明,三个αβ异源二聚体与一个II三聚体结合。我们现在使用表位标记的II类亚基和密度梯度实验分析了II类和II类复合物的组成和大小。我们发现II- II类低聚物由一个II类异源二聚体和一个II三聚体组成,这样DR、DQ和DP同型就包含在与II的不同配合物中。我们提出了II- II类低聚物的结构模型,并推测五聚体II- II类配合物向细胞膜弯曲,抑制了其他II类异二聚体与II的结合。
The HLA gene complex encodes three class II isotypes, DR, DQ, and DP. HLA class II molecules are peptide receptors that present antigens for recognition by T lymphocytes. In antigen presenting cells, the assembly of matched α and β subunits to heterodimers is chaperoned by invariant chain (Ii). Ii forms a homotrimer with three binding sites for class II heterodimers. The current model of class II and Ii structure states that three αβ heterodimers bind to an Ii trimer. We have now analyzed the composition and size of the complexes of class II and Ii using epitope tagged class II subunits and density gradient experiments. We show here that class II-Ii oligomers consist of one class II heterodimer associated with one Ii trimer, such that the DR, DQ and DP isotypes are contained within separate complexes with Ii. We propose a structural model of the class II-Ii oligomer and speculate that the pentameric class II-Ii complex is bent towards the cell membrane, inhibiting the binding of additional class II heterodimers to Ii.
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