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Line broadening as a signature of chemical exchange and entropic priming.

机译:线变宽是化学交换和熵引发的标志。

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摘要

We implemented Nuclear Magnetic Resonance isotope filters to allow for structural mapping of exchange-broadened resonances within the Pin-1 WW domain and Tissue Factor Cytoplasmic Tail complex. Isotope filtered pulse program optimization on the Bruker 800 MHz spectrometer cryogenic probe involved the tuning of time delays with adjustment of adiabatic gradients for signal suppression. We report the development of AMBER, DYANA, and MOLMOL libraries for the modified amino acids; phosphoserine, phosphothreonine, and phosphotyrosine and used during model refinement of this complex, centered about a canonical pSer/Pro motif.;Leukocyte Function Associated antigen-1 was investigated using a high affinity cystine mutant (K287C/K294C). Resonance spin systems for residues located in the alpha7-helix and the MIDAS were absent and unassigned due to line broadening and suggests dynamic motions on the NMR timescale. Entropic priming of LFA-1 I-domain may enhance its binding affinity for ICAM-1 and is consistent with a mechanism of negative cooperatively between the alpha I-domain and beta I-like-domain.
机译:我们实施了核磁共振同位素过滤器,以实现Pin-1 WW域和组织因子细胞质尾复合体内交换扩展共振的结构映射。在布鲁克800 MHz光谱仪低温探头上进行的同位素过滤脉冲程序优化涉及通过调整绝热梯度来抑制信号的时间延迟。我们报告了用于修饰氨基酸的AMBER,DYANA和MOLMOL库的开发;磷酸丝氨酸,磷酸苏氨酸和磷酸酪氨酸用于该复合物的模型优化过程中,以典型的pSer / Pro母题为中心。白细胞功能相关抗原-1使用高亲和力胱氨酸突变体(K287C / K294C)进行了研究。由于谱线加宽,缺少位于α7-螺旋和MIDAS中的残基的共振自旋系统,并且未分配,并暗示了NMR时间尺度上的动态运动。 LFA-1 I结构域的熵引发可能增强其对ICAM-1的结合亲和力,并且与αI结构域和βI样结构域之间负协同作用的机制相一致。

著录项

  • 作者

    Craft, John W., Jr.;

  • 作者单位

    University of Houston.;

  • 授予单位 University of Houston.;
  • 学科 Chemistry Analytical.;Chemistry Biochemistry.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 246 p.
  • 总页数 246
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;生物化学;
  • 关键词

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