menaquinone metabolic process menaquinone biosynthetic process vitamin K2 biosynthesis The chemical reactions and pathways resulting in the formation of any of the menaquinones. Structurally, menaquinones consist of a methylated naphthoquinone ring structure and side chains composed of a variable number of unsaturated isoprenoid residues. Menaquinones that have vitamin K activity and are known as vitamin K2. vitamin K2 biosynthetic process menaquinone anabolism menaquinone synthesis GO:0009234 menaquinone formation multiprenylmenaquinone biosynthesis menatetrenone biosynthesis biological_process menatetrenone biosynthetic process menaquinone biosynthesis multiprenylmenaquinone biosynthetic process MetaCyc:MENAQUINONESYN-PWY ketone biosynthetic process