"Component of a hydro-lyase that catalyzes the dehydration of mevalonate 5-phosphate (MVA5P) to form trans-anhydromevalonate 5-phosphate (tAHMP). Involved in the archaeal mevalonate (MVA) pathway, which provides fundamental precursors for isoprenoid biosynthesis, such as isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP)."xsd:string