我们描述了乙二胺四乙酸(EDTA)衍生物的合成途径,该衍生物可以通过立体化学独特方式连接到EDTA的C-1碳原子的甲基硫代磺酸盐部分连接到蛋白质中半胱氨酸残基的表面暴露的巯基官能团。此类化合物可用于在溶液中比对蛋白质,而无需添加液晶介质,因此对于生物分子的NMR光谱分析非常感兴趣。通过测量发光来确定顺磁性标签与镧系元素离子的结合常数。对于Tb(+3)-配体配合物,获得的K(b)值为6.5 x 10(17)M(-1)。该值与相关EDTA化合物的文献值非常一致。此外,
the magnetic susceptibility tensor of a series of lanthanide complexes of lactose show that its glycosidicbond samples syn/syn, anti/syn and syn/anti ϕ/ψ regions of the conformationalspace in water. The analysis indicates a higher reliability of pseudocontact shift data as compared to residual dipolar couplings with the presently available weakly orienting paramagnetic tagging technique. The method
乳糖的糖苷键动力学是通过基于顺磁性标记的NMR技术研究的,该技术可以收集单个化合物的一系列异常大的NMR数据。通过使用与距离和方向有关的残留偶极耦合和伪接触位移,一系列乳糖的镧系元素络合物的计算构象概率和磁化率张量的方向同时拟合,表明其糖苷键样品syn / syn,anti / syn和syn / anti ϕ / ψ构象空间在水中的区域。该分析表明,与使用当前可用的弱取向顺磁标记技术的残留偶极耦合相比,伪接触位移数据具有更高的可靠性。本文提出的方法允许对寡糖的动态行为有更好的理解。
Two New Chiral EDTA-Based Metal Chelates for Weak Alignment of Proteins in Solution
A short synthesis of EDTA-based metal chelates that can be attached to the cysteine residue of a protein via a disuffide bond is described. The complexes were used after coordination of lanthanides to align trigger factor and apo-calmodulin in solution to yield residual dipolar couplings and pseudocontact shifts. Alignment tensors for the new tags are linearly independent compared to those of previously published tags.