Cavalli Andrea, Salvatella Xavier, Dobson Christopher M, Vendruscolo Michele
Department of Chemistry, Cambridge University, Cambridge CB2 1EW, United Kingdom.
Proc Natl Acad Sci U S A. 2007 Jun 5;104(23):9615-20. doi: 10.1073/pnas.0610313104. Epub 2007 May 29.
NMR spectroscopy plays a major role in the determination of the structures and dynamics of proteins and other biological macromolecules. Chemical shifts are the most readily and accurately measurable NMR parameters, and they reflect with great specificity the conformations of native and nonnative states of proteins. We show, using 11 examples of proteins representative of the major structural classes and containing up to 123 residues, that it is possible to use chemical shifts as structural restraints in combination with a conventional molecular mechanics force field to determine the conformations of proteins at a resolution of 2 angstroms or better. This strategy should be widely applicable and, subject to further development, will enable quantitative structural analysis to be carried out to address a range of complex biological problems not accessible to current structural techniques.
核磁共振光谱在确定蛋白质和其他生物大分子的结构及动力学方面发挥着重要作用。化学位移是最易于且准确测量的核磁共振参数,它们能高度特异性地反映蛋白质天然态和非天然态的构象。我们以11个代表主要结构类别的蛋白质为例,这些蛋白质含有多达123个残基,结果表明可以将化学位移作为结构约束,结合传统的分子力学力场,以2埃或更高的分辨率确定蛋白质的构象。这一策略应具有广泛的适用性,并且经过进一步发展,将能够进行定量结构分析,以解决一系列当前结构技术无法解决的复杂生物学问题。