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Squalene epoxidase (SE) is one of the most highly regulated enzymes of the cholesterol biosynthesis pathway. Here we identify the molecular basis for SREBP-2 synergy with NF-Y as the prime regulator of SE gene transcription. As expected cholesterol markedly suppressed transcriptional activity, while SREBP-1a, -1c and -2 activated it. Knock down of SREBP-2 mRNA resulted in an 85% reduction in SE expression...