Triosephosphate isomerase: 15N and 13C chemical shift assignments and conformational change upon ligand binding by magic-angle spinning solid-state NMR spectroscopy.
Triosephosphate isomerase: 15N and 13C chemical shift assignments and conformational change upon ligand binding by magic-angle spinning solid-state NMR spectroscopy.
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磷酸三糖异构酶：通过魔角旋转固态核磁共振波谱分析配体结合时的 15N 和 13C 化学位移和构象变化。
DOI：
10.1016/j.jmb.2009.10.043
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发表时间：
2010
影响因子：
5.6
通讯作者：
McDermott,AnnE
中科院分区：
文献类型：
--
作者：
Xu,Yimin;Lorieau,Justin;McDermott,AnnE
Microcrystalline uniformly13C,15N-enriched yeast triosephosphate isomerase (TIM) is sequentially assigned by high-resolution solid-state NMR (SSNMR). Assignments are based on intraresidue and interresidue correlations, using dipolar polarization transfer methods, and guided by solution NMR assignments of the same protein. We obtained information on most of the active-site residues involved in chemistry, including some that were not reported in a previous solution NMR study, such as the side-chain carbons of His95. Chemical shift differences comparing the microcrystalline environment to the aqueous environment appear to be mainly due to crystal packing interactions. Site-specific perturbations of the enzyme's chemical shifts upon ligand binding are studied by SSNMR for the first time. These changes monitor proteinwide conformational adjustment upon ligand binding, including many of the sites probed by solution NMR and X-ray studies. Changes in Gln119, Ala163, and Gly210 were observed in our SSNMR studies, but were not reported in solution NMR studies (chicken or yeast). These studies identify a number of new sites with particularly clear markers for ligand binding, paving the way for future studies of triosephosphate isomerase dynamics and mechanism.
