Interaction of HLA-B27 homodimers with KIR3DL1 and KIR3DL2, unlike HLA-B27 heterotrimers, is independent of the sequence of bound peptide

Interaction of HLA-B27 homodimers with KIR3DL1 and KIR3DL2, unlike HLA-B27 heterotrimers, is independent of the sequence of bound peptide
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DOI:
10.1002/eji.200635997
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发表时间:
2007-05-01
影响因子:
5.4
通讯作者:
Bowness, Paul
Bowness, Paul
中科院分区:
医学3区
文献类型:
--
作者:
Kollnberger, Simon;Chan, Antoni;Bowness, Paul

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HLA-B27 可形成 β-2 微球蛋白 (β 2m) 相关异源三聚体 (HLA-B27) 和无 β 2m 同源二聚体 (13272)。在这里,我们研究了复合肽在这些形式的 B27 与杀伤细胞免疫球蛋白 (Ig) 样受体 KlR3DL1 和 KIR3DL2 以及 Ig 样转录物 LILRB1 和 LILRB2 相互作用中的作用。 HLA-B27 四聚体与五种不同的天然加工自肽中的三种以及与表达 KIR3DL1 的转染子和 NK 细胞结合的七个病原体衍生表位中的三个复合。含有第 8 位带电荷氨基酸的肽的异三聚体复合物不与 KIR3DL1 结合;然而,对类似肽的研究表明,这些并不是参与结合的唯一肽残基。 HLA-B27 连接 KIR3DL1 以肽依赖性方式抑制 NK 细胞 IFN-γ 的产生。在存在肽表位的情况下,B27(而非 HLA-A2、B7 或 B57)重链形成同二聚体。 B27(2) 与 KIR3DL1、KIR3DL2 和 LILRB2 结合,但不与 LILRB1 结合。 B272 连接 KIR3DL2 可抑制 NK 和 T 细胞 IFN-γ 的产生。与 HLA 异源三聚体相比,B272 与 KIR 的结合不依赖于结合肽的序列。 KIR 与经典 HLA 和 B272 结合的差异可能与脊柱关节炎的发病机制有关。
HLA-B27 can form beta-2 microglobulin (beta 2m)-associated heterotrimers (HLA-B27) and beta 2m-free homodimers (13272). Here, we study the role of complexed peptide in the interaction of these forms of B27 with the killer cell immunoglobulin (Ig) -like receptors KlR3DL1 and KIR3DL2 and with Ig-like transcripts LILRB1 and LILRB2. HLA-B27 tetramers complexed with three of five different naturally processed self peptides and three of seven pathogen-derived epitopes bound to KIR3DL1-expressing transfectants and NK cells. Heterotrimeric complexes containing peptides with charged amino acids at position 8 did not bind to KIR3DL1; however, studies with analogue peptides demonstrated that these are not the only peptide residues involved in binding. KIR3DL1 ligation by HLA-B27 inhibited NK cell IFN-gamma production in a peptide-dependent fashion. B27 but not HLA-A2, B7 or B57 heavy chains formed homodimers in the presence of peptide epitopes. B27(2) bound to KIR3DL1, KIR3DL2 and LILRB2 but not LILRB1. KIR3DL2 ligation by B272 inhibited NK and T cell IFN-gamma production. By contrast with HLA heterotrimers, B272 binding to KIR did not depend on the sequence of the bound peptide. Differences in KIR binding to classical HLA and B272 could be involved in the pathogenesis of spondyloarthritis.