The present invention provides methods of producing an isoprenoid or an isoprenoid precursor in a genetically modified host
cell. The methods generally involve modulating the level of hydroxymethylglutaryl-CoA (HMG-CoA) in the
cell, such that the level of HMG-CoA is not toxic to the
cell and / or does not substantially inhibit
cell growth, but is maintained at a level that provides for high-level production of mevalonate, IPP, and other downstream products of an isoprenoid or isoprenoid pathway, e.g., polyprenyl diphosphates and isoprenoid compounds. The present invention further provides genetically modified host cells that are suitable for use in a subject method. The present invention further provides recombinant
nucleic acid constructs for use in generating a subject genetically modified host cell, including recombinant
nucleic acid constructs comprising
nucleotide sequences encoding one or more
mevalonate pathway enzymes, and recombinant vectors (e.g.,
recombinant expression vectors) comprising same. The present invention further provides methods for identifying nucleic acids that
encode HMG-CoA
reductase (HMGR) variants that provide for relief of HMG-CoA accumulation-induced
toxicity. The present invention further provides methods for identifying agents that reduce
intracellular accumulation of HMG-CoA.