The enzyme myrcene synthase (EC 4.2.3.15) catalyzes the chemical reaction

geranyl diphosphate ${\displaystyle \rightleftharpoons }$ myrcene + diphosphate

This enzyme belongs to the family of lyases, specifically those carbon-oxygen lyases acting on phosphates. The systematic name of this enzyme class is geranyl-diphosphate diphosphate-lyase (myrcene-forming). This enzyme participates in monoterpenoid biosynthesis.

• Bohlmann J, Steele CL, Croteau R (1997). "Monoterpene synthases from grand fir (Abies grandis). cDNA isolation, characterization, and functional expression of myrcene synthase, (−)-(4S)-limonene synthase, and (−)-(1S,5S)-pinene synthase". J. Biol. Chem. 272 (35): 21784–92. doi:10.1074/jbc.272.35.21784. PMID 9268308.