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Methylmercury : ウィキペディア英語版 | Methylmercury
Methylmercury (sometimes methyl mercury) is an organometallic cation with the formula . It is a bioaccumulative environmental toxicant. ==Structure== "Methylmercury" is a shorthand for "monomethylmercury", and is more correctly "''monomethylmercury(II) cation''". It is composed of a methyl group (3-) bonded to a mercury ion; its chemical formula is + (sometimes written as MeHg+). As a positively charged ion it readily combines with anions such as chloride (−), hydroxide (−) and nitrate (3−). It also has very high affinity for sulfur-containing anions, particularly the thiol (-) groups on the amino acid cysteine and hence in proteins containing cysteine, forming a covalent bond. More than one cysteine moiety may coordinate with methylmercury, and methylmercury may migrate to other metal-binding sites in proteins.
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