Metabolite Structure Assignment Using In Silico NMR Techniques.
Metabolite Structure Assignment Using In Silico NMR Techniques.
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DOI:
10.1021/acs.analchem.0c00768
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发表时间:
2020-08-04
影响因子:
7.4
通讯作者:
Merz KM Jr
中科院分区:
文献类型:
--
作者:
Das S;Edison AS;Merz KM Jr
A major challenge for Metabolomic analysis is to obtain an unambiguous identification of the metabolites detected in a sample. Among metabolomics techniques, NMR spectroscopy is a sophisticated, powerful and generally applicable spectroscopic tool that can be used to ascertain the correct structure of newly isolated biogenic molecules. However, accurate structure prediction using computational NMR techniques depends on how much of the relevant conformational space of a particular compound is considered. It is intrinsically challenging to calculate NMR chemical shifts using high level DFT when the conformational space of a metabolite is extensive. In this work, we developed NMR chemical shift calculation protocols using a machine learning model in conjunction with standard DFT methods. The pipeline encompasses the following steps: (1) conformation generation using a force field (FF) based method, (2) filtering the FF generated conformations using the ASE-ANI machine learning model, (3) clustering of the optimized conformations based on structural similarity to identify chemically unique conformations, (4) DFT structural optimization of the unique conformations and (5) DFT NMR chemical shift calculation. This protocol can calculate the NMR chemical shifts of a set of molecules using any available combination of DFT theory, solvent model, and NMR-active nuclei, using both user-selected reference compounds and/or linear regression methods. Our protocol reduces the overall computational time by 2 orders of magnitude (see Figure 1) over methods that optimize the conformations using fully ab initio methods, while still producing good agreement with experimental observations. The complete protocol is designed in such a manner that makes the computation of chemical shifts tractable for a large number of conformationally flexible metabolites.
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影响因子:
4
作者:
Bingol, Kerem;Li, Da-Wei;Bruschweiler-Li, Lei;Cabrera, Oscar A.;Megraw, Timothy;Zhang, Fengli;Brueschweiler, Rafael
通讯作者:
Brueschweiler, Rafael
影响因子:
5.5
作者:
Fu, Zheng;Li, Xue;Miao, Yipu;Merz, Kenneth M., Jr.
通讯作者:
Merz, Kenneth M., Jr.
影响因子:
5.5
作者:
Fu, Zheng;Li, Xue;Merz, Kenneth M., Jr.
通讯作者:
Merz, Kenneth M., Jr.
DOI:
10.2174/2213235x04666160407212156
发表时间:
2016-08
期刊:
Current Metabolomics
影响因子:
--
作者:
Clendinen CS;Stupp GS;Wang B;Garrett TJ;Edison AS
通讯作者:
Edison AS
影响因子:
4.4
作者:
BECKE, AD
通讯作者:
BECKE, AD