Recent studies on biomethylation and demethylation of toxic elements.

Abstract:

:Methylcobalamin (methyl-B12) has been implicated in the biomethylation of the heavy metals (mercury, tin, platinum, gold, and thallium) as well as the metalloids (arsenic, selenium, tellurium and sulfur). In addition, methylcobalamin has been shown to react with lead, but the lead-alkyl product is unstable in water. Details of the kinetics and mechanisms for biomethylation of arsenic are presented, with special emphasis on synergistic reactions between metal and metalloids in different oxidation states. This study explains why synergistic, or antagonistic, processes can occur when one toxic element reacts in the presence of another. The relative importance of biomethylation reactions involving methylcobalamin will be compared to those reactions where S-adenosylmethionine is involved.

authors

Ridley WP,Dizikes L,Cheh A,Wood JM

doi

10.1289/ehp.771943

subject

Has Abstract

pub_date

1977-08-01 00:00:00

pages

43-6

eissn

0091-6765

issn

1552-9924

journal_volume

19

pub_type

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