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Time-resolved NMR: extracting the topology of complex enzyme networks.


ABSTRACT: The use of nondestructive NMR spectroscopy for enzymatic studies offers unique opportunities to identify nearly all enzymatic byproducts and detect unstable short-lived products or intermediates at the molecular level; however, numerous challenges must be overcome before it can become a widely used tool. The biosynthesis of acetyl-coenzyme A (acetyl-CoA) by acetyl-CoA synthetase is used here as a case study for the development of an analytical NMR-based time-course assay platform. We describe an algorithm to deconvolve superimposed spectra into spectra for individual molecules, and further develop a model to simulate the acetyl-CoA synthetase enzyme reaction network using the data derived from time-course NMR. Simulation shows indirectly that synthesis of acetyl-CoA is mediated via an enzyme-bound intermediate (possibly acetyl-AMP) and is accompanied by a nonproductive loss from an intermediate. The ability to predict enzyme function based on partial knowledge of the enzymatic pathway topology is also discussed.

SUBMITTER: Jiang Y 

PROVIDER: S-EPMC3195686 | biostudies-literature | 2010 Oct

REPOSITORIES: biostudies-literature

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Time-resolved NMR: extracting the topology of complex enzyme networks.

Jiang Yingnan Y   McKinnon Tyler T   Varatharajan Janani J   Glushka John J   Prestegard James H JH   Sornborger Andrew T AT   Schüttler Heinz-Bernd HB   Bar-Peled Maor M  

Biophysical journal 20101001 7


The use of nondestructive NMR spectroscopy for enzymatic studies offers unique opportunities to identify nearly all enzymatic byproducts and detect unstable short-lived products or intermediates at the molecular level; however, numerous challenges must be overcome before it can become a widely used tool. The biosynthesis of acetyl-coenzyme A (acetyl-CoA) by acetyl-CoA synthetase is used here as a case study for the development of an analytical NMR-based time-course assay platform. We describe an  ...[more]

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