Nano-second protein dynamics of key residue at Position 38 in catechol-O-methyltransferase system: a time-resolved fluorescence study
Human catechol-O-methyltransferase, a key enzyme related to neurotransmitter metabolism, catalyses a methyl transfer from S-adenosylmethionine to catechol. Although extensive studies aim to understand the enzyme mechanisms, the connection of protein dynamics and enzyme catalysis is still not clear....
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Published in | Journal of biochemistry (Tokyo) Vol. 168; no. 4; pp. 417 - 425 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
England
01.10.2020
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Subjects | |
Online Access | Get full text |
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Summary: | Human catechol-O-methyltransferase, a key enzyme related to neurotransmitter metabolism, catalyses a methyl transfer from S-adenosylmethionine to catechol. Although extensive studies aim to understand the enzyme mechanisms, the connection of protein dynamics and enzyme catalysis is still not clear. Here, W38in (Trp143Phe) and W38in/Y68A (Trp143Phe with Tyr68Ala) mutants were carried out to study the relationship of dynamics and catalysis in nano-second timescale using time-resolved fluorescence lifetimes and Stokes shifts in various solvents. The comprehensive data implied the mutant W38in/Y68A with lower activity is more rigid than the 'WT'-W38in, suggesting the importance of flexibility at residue 38 to maintain the optimal catalysis. |
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ISSN: | 0021-924X 1756-2651 |
DOI: | 10.1093/jb/mvaa063 |