Activating Ly-49D and inhibitory Ly-49A natural killer cell receptors demonstrate distinct requirements for interaction with H2-D(d).

Activating Ly-49D and inhibitory Ly-49A natural killer cell receptors demonstrate distinct requirements for interaction with H2-D(d).
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DOI:
10.1084/jem.192.3.447
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发表时间:
2000-08-07
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Seaman WE
Seaman WE
中科院分区:
其他
文献类型:
--
作者:
Nakamura MC;Hayashi S;Niemi EC;Ryan JC;Seaman WE

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激活性Ly-49 D受体和抑制性Ly-49 A受体在与相同的主要组织相容性复合物配体H2-Dd相互作用后介导对自然杀伤(NK)细胞毒性的相反作用。为了比较Ly-49 D和Ly-49 A与H2-Dd的相互作用,我们在H2-Dd中产生突变,并检查这些突变体通过Ly-49 D激活裂解或通过Ly-49 A抑制裂解的功能能力。H2-Dd α1螺旋或α2螺旋中的特定单个氨基酸变化消除了Ly-49 D介导的细胞毒性,但这些变化对Ly-49 A依赖性抑制无显著影响。肽结合沟底部的三个α2结构域突变中的每一个都降低了Ly-49 D或Ly-49 A的功能识别,但需要所有三个突变才能完全消除Ly-49 A的抑制作用。我们的研究表明,与Ly-49 A/H2-Dd相互作用相比,Ly-49 D/H2-Dd相互作用需要不同的决定因素。这些差异对于NK细胞中激活和抑制信号的整合具有重要意义。
The activating Ly-49D receptor and the inhibitory Ly-49A receptor mediate opposing effects on natural killer (NK) cell cytotoxicity after interaction with the same major histocompatibility complex ligand, H2-Dd. To compare Ly-49D and Ly-49A interactions with H2-Dd, we created mutations in H2-Dd and examined the functional ability of these mutants to activate lysis through Ly-49D or to inhibit lysis through Ly-49A. Specific single amino acid changes in either the H2-Dd α1 helix or the α2 helix abrogated Ly-49D–mediated cytotoxicity, but these changes had no significant effect on Ly-49A–dependent inhibition. Each of three α2 domain mutations in the floor of the peptide binding groove reduced functional recognition by either Ly-49D or Ly-49A, but all three were required to fully abrogate inhibition by Ly-49A. Our studies indicate that Ly-49D/H2-Dd interactions require distinct determinants compared with Ly-49A/H2-Dd interactions. These differences have important implications for the integration of activating and inhibitory signals in NK cells.
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