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• W2792434480 endingPage "1897" @default.
• W2792434480 startingPage "1885" @default.
• W2792434480 abstract "HPPK (6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase) is a monomeric protein with 158 residues, which undergoes large-scale conformational changes between apo, open, and holo states responding to ligand binding for its function. It has been explored widely as an excellent target for potential antibacterial drug development. However, little is known about how conformational dynamics between the native states influences the substrate recognition and the functionality of enzymatic catalysis. Here, we report a coarse-grained triple-basin structure-based model upon ligand binding to describe such multiple-state system by the molecular dynamics simulation. With our model, we have made theoretical predictions that are in good agreement with the experimental measurements. Our results revealed the intrinsic conformational fluctuations between apo and open states without ligand binding. We found that HPPK can switch to the activated holo state upon the ordered binding of the two ligands (ATP and HP). We uncovered the underlying mechanism by which major induced fit and minor population shift pathways coexist upon ligand binding by quantitative flux analysis. Additionally, we pointed out the structural origin for the conformational changes and identified the key residues as well as contact interactions. We further explored the temperature effect on the conformational distributions and pathway weights. It gave strong support that higher temperatures promote population shift, while the induced fit pathway is always the predominant activation route of the HPPK system. These findings will provide significant insights of the mechanisms of the multistate conformational dynamics of HPPK upon ligand binding." @default.
• W2792434480 created "2018-03-29" @default.
• W2792434480 creator A5008210627 @default.
• W2792434480 creator A5058849663 @default.
• W2792434480 creator A5076117572 @default.
• W2792434480 date "2018-02-06" @default.
• W2792434480 modified "2023-10-17" @default.
• W2792434480 title "Exploration of Multistate Conformational Dynamics upon Ligand Binding of a Monomeric Enzyme Involved in Pyrophosphoryl Transfer" @default.
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• W2792434480 doi "https://doi.org/10.1021/acs.jpcb.7b12562" @default.
• W2792434480 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29385349" @default.
• W2792434480 hasPublicationYear "2018" @default.
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