Role of HLA-B*5101 binding nonamer peptides in formation of the HLA-Bw4 public epitope.

Role of HLA-B*5101 binding nonamer peptides in formation of the HLA-Bw4 public epitope.
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HLA-B*5101 结合九聚肽在 HLA-Bw4 公共表位形成中的作用。

DOI:
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发表时间:
1996
影响因子:
4.4
通讯作者:
Masafumi Takiguchi
Masafumi Takiguchi
中科院分区:
医学3区
文献类型:
--
作者:
Y. Takamiya;T. Sakaguchi;Kiyoshi Miwa;Masafumi Takiguchi

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HLA-Bw4 是由特定同种抗血清和 mAb 区分的两个 HLA-B 公共表位之一。据信HLA-B分子的77-83位形成了被特异性抗体识别的Bw4表位。该表位也被 NK 细胞上的 NKB1 受体识别。我们研究了与 HLA-B 分子结合的肽对两种 HLA-Bw4 特异性单克隆抗体 TU109 和 TU48 识别的 Bw4 表位形成的作用,这两种单克隆抗体识别了 HLA-B52、-B52 和 -B53 之间 Bw4 表位的差异。使用一组 HLA-B*5101 结合九聚肽检查这些 mAb 对 HLA-B*5101-肽复合物的识别。 HLA-B*5101 结合肽的序列对 TU48 mAb 与 HLA-B*5101 分子的结合影响最小。相反,TU109 mAb 与 HLA-B*5101 分子的结合受到与 HLA-B*5101 分子结合的肽序列的严重影响。 TU109 mAb 无法识别 P8 处带有小残基或带负电荷的残基的 HLA-B*5101 结合肽。 P8 的一组突变肽证实了该结果。综上所述,这些结果表明 P8 的带正电荷或中和的侧链对于该 mAb 识别的 Bw4 表位形成至关重要。
HLA-Bw4 is one of two HLA-B public epitopes which are discriminated by specific alloantisera and mAb. It is believed that the 77-83 of HLA-B molecules form the Bw4 epitope recognized by specific antibodies. This epitope is also recognized by NKB1 receptors on NK cells. We investigated the role of a peptide bound to HLA-B molecules on the formation of the Bw4 epitope recognized by two HLA-Bw4-specific mAb, TU109 and TU48, which recognized the difference of the Bw4 epitope among HLA-B52, -B52 and -B53. Recognition of the HLA-B*5101-peptide complex by these mAb was examined using a panel of HLA-B*5101 binding nonamer peptides. The sequence of HLA-B*5101 binding peptides has a minimum influence on the binding of TU48 mAb to HLA-B*5101 molecules. In contrast, the binding of TU109 mAb to HLA-B*5101 molecules was critically influenced by the sequence of a peptide bound to HLA-B*5101 molecules. TU109 mAb did not recognize HLA-B*5101 binding peptides carrying small or negatively charged residues at P8. The results were confirmed by a panel of mutant peptides at P8. Taken together, these results indicate that a positively charged or neutralized side chain of P8 is critical for the epitope formation of Bw4 recognized by this mAb.
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