Chemistry, 05.05.2020 05:30 jaffeisabel

Proteins can be cleaved specifically at the amide bond on the carboxyl side of methionine residues by reaction with cyanogen bromide (above). Cleavage proceeds by a four-stage mechanism. The first stage is a nucleophilic substitution reaction of the sulfur of the methionine side chain with BrCN to give a cyanosulfonium ion, [R2SCN] . Draw curved arrows for the first step of this stage. brcn

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Proteins can be cleaved specifically at the amide bond on the carboxyl side of methionine residues b...