transmethylation

trans- +‎ methylation

transmethylation (plural transmethylations)

1. (organic chemistry, biochemistry) The transfer of a methyl group between molecules, especially between biological compounds such as amino acids or the components of nucleic acids.
   • 1940 July, V Du Vigneaud, “The transfer of the methyl group from methionine to choline and creatine”, in The Journal of Biological Chemistry, page 787:

     It was realized that direct proof of the transfer of the methyl group (transmethylation) was highly desirable.

• transmethylase
• transmethylate