A QM/MM study of the phosphoryl transfer to the Kemptide substrate catalyzed by protein kinase A. The effect of the phosphorylation state of the protein on the mechanism

Literature Information

Publication Date 2010-11-05
DOI 10.1039/C0CP01062F
Impact Factor 3.676
Authors

Manuel Montenegro, Mireia Garcia-Viloca, José M. Lluch, Àngels González-Lafont


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Abstract

We present here a theoretical study of the phosphoryl transfer catalytic mechanism of protein kinase A, which is the best known member of the large protein kinase family. We have built different theoretical models of the complete PKA–Mg2–ATP–substrate system to explore the two most accepted reaction pathways, using for the first time in a reaction mechanism theoretical study, the heptapeptide substrate Kemptide, which is relevant for its high efficiency and small size. The effect of the protein configuration, as modeled by two different X-ray structures with different phosphorylation states and degrees of flexibility, has been analyzed. The results indicate that the environmental conditions can influence the availability of the pathways and thus the choice of the mechanism to be followed. In addition, the roles of the two active site conserved residues, Asp166 and Lys168, have been analyzed for each reaction mechanism.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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