Homocysteine S-methyltransferase involved in the conversion of S-adenosylmethionine (AdoMet) to methionine to control the methionine/AdoMet ratio. Also converts S-methylmethionine (SMM) to methionine. L-homocysteine + S-methyl-L-methionine = H(+) + 2 L-methionine Present with 606 molecules/cell in log phase SD medium.