Geranyl diphosphate 2-C-methyltransferase (, SCO7701, GPP methyltransferase, GPPMT, 2-methyl-GPP synthase, MGPPS, geranyl pyrophosphate methyltransferase) is an enzyme with systematic name S-adenosyl-L-methionine:geranyl-diphosphate 2-C-methyltransferase. This enzyme catalyses the following chemical reaction
This enzyme takes part in synthesis of 2-methylisoborneol.