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Encyclopedia > Demethylation

Demethylation is the chemical process resulting in the removal a methyl group (CH3) from a molecule. In biochemical systems, this process is often catalyzed by an enzyme such as one of the Cytochrome P450 (CYP) family of liver enzymes. In chemistry a methyl-group is a hydrophobic Alkyl functional group which is derived from methane (CH4). ... Biochemistry is the chemistry of life. ... It has been suggested that this article or section be merged into Catalysis. ... Ribbon diagram of the enzyme TIM, surrounded by the space-filling model of the protein. ...


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  Results from FactBites:
 
CT 11/96 Pergolide: (2129 words)
2 demethylation of quaternary ammonium salts by lithium thiopropoxide in hexamethylphosphoric triamide (HMPA).
To implement this selective demethylation strategy, we had to first quaternize N-6 of dihydrolysergol with a propyl substituent.
To achieve effective demethylation and thiomethyl ether formation, a minimum of 8 equiv sodium thiomethoxide per mole of intermediate 6 was required.
SOFIA - Bacterial demethylation of methylmercury in the South Florida Ecosystem - Proposal 1998 (1995 words)
This later process, termed demethylation, must also be quantified in order to arrive at values for net methylation (or demethylation) of mercury which are most suited for incorporation into mathematical models.
The most-studied mechanism for demethylation is that of the bacterial mer operon which encodes for enzymes which cleave the carbon-mercury bond (organomercurial lyase) and reduce Hg (11) to Hg (0) (mercuric reductase).
Therefore, not only are estimates of the in situ rate of demethylation needed to determine M/D ratios (i.e., rates of net methylation), but process-oriented studies are needed to determine which type of demethylation reactions are occurring and what is the fate of the mercury.
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