High resolution X-ray and NMR structural study of human T-cell immunoglobulin and mucin domain containing protein-3.

High resolution X-ray and NMR structural study of human T-cell immunoglobulin and mucin domain containing protein-3.
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人类T细胞免疫球蛋白和含有蛋白质3的粘蛋白结构域的高分辨率X射线和NMR结构研究。

DOI:
10.1038/s41598-018-35754-0
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发表时间:
2018-11-30
期刊:
影响因子:
4.6
通讯作者:
Blumberg RS
Blumberg RS
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Gandhi AK;Kim WM;Sun ZJ;Huang YH;Bonsor DA;Sundberg EJ;Kondo Y;Wagner G;Kuchroo VK;Petsko G;Blumberg RS

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T细胞免疫球蛋白和粘蛋白结构域蛋白-3(TIM-3)是一种重要的免疫调节因子。在这里,我们描述了一种新的高分辨率(1.7 μ m)的晶体结构的人(h)TIM-3 N-末端可变免疫球蛋白(IgV)域与结合钙(Ca++),这是证实了核磁共振(NMR)光谱。与小鼠(m)TIM-3、hTIM-1和hTIM-4相比,在hTIM-3的B-C、C′-C″和C′-D环中观察到显著的构象差异。此外,hTIM-3的C-C′环的构象与hTIM-4明显不同。与已知的磷脂酰丝氨酸(PtdSer)与mTIM-3和mTIM-4的金属离子依赖性结合一致,Ca++结合的hTIM-3的NMR光谱分析和晶体结构揭示了hTIM-3 F-G环中的残基与Ca++配位结合。此外,我们建立了一种新的生化测定,以确定hTIM-3的功能,通过结合人癌胚抗原细胞粘附分子1(CEACAM 1)。这些研究为理解和靶向hTIM-3提供了新的见解。
T-cell immunoglobulin and mucin domain containing protein-3 (TIM-3) is an important immune regulator. Here, we describe a novel high resolution (1.7 Å) crystal structure of the human (h)TIM-3 N-terminal variable immunoglobulin (IgV) domain with bound calcium (Ca++) that was confirmed by nuclear magnetic resonance (NMR) spectroscopy. Significant conformational differences were observed in the B-C, C′-C″ and C′-D loops of hTIM-3 compared to mouse (m)TIM-3, hTIM-1 and hTIM-4. Further, the conformation of the C-C′ loop of hTIM-3 was notably different from hTIM-4. Consistent with the known metal ion-dependent binding of phosphatidylserine (PtdSer) to mTIM-3 and mTIM-4, the NMR spectral analysis and crystal structure of Ca++-bound hTIM-3 revealed that residues in the hTIM-3 F-G loop coordinate binding to Ca++. In addition, we established a novel biochemical assay to define hTIM-3 functionality as determined by binding to human carcinoembryonic antigen cell adhesion molecule 1 (CEACAM1). These studies provide new insights useful for understanding and targeting hTIM-3.
TIM-3 表达是肿瘤组织中调节性 T 细胞的特征,并与肺癌进展相关
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