UCLA researchers reconstitute enzyme that synthesizes cholesterol drug ...( Researchers from the UCLA Henry Samu...)

Researchers from the UCLA Henry Samueli School of Engineering and Applied Science have for the first time successfully reconstituted in the laboratory the enzyme responsible for producing the blockbuster cholesterol-lowering drug lovastatin.

The research, published Oct. 23 in the journal Science, could potentially lead to the development of other compounds with similarly beneficial effects.

The lovastatin-synthesizing enzyme is one of the most interesting but least understood of the polyketide synthases, which are found in filamentous fungi and which play a crucial role in the synthesis of "small molecule natural products" pharmacologically or biologically potent compounds produced by living organisms, many of which are the active ingredients in pharmaceuticals.

Commonly used antibiotics, such as tetracycline, are produced by polyketide synthases. Polyketides represent a class of 7,000 known structures, of which more than 20 are commercial drugs, including the immunosuppressant rapamycin, the antibiotic erythromycin and the anticancer drug doxorubicin.

"In this study, we studied the enzyme that makes a small-molecule precursor to lovastatin. And what's really different about this enzyme, compared to all other enzymes people have studied, is that this enzyme is extraordinarily large," said Yi Tang, associate professor of chemical and biomolecular engineering. "It's one of the largest enzymes ever to be reconstituted in a test tube. It is 10 times the size of most enzymes people study."

The enzyme used in Tang's study has seven active sites and catalyzes more than 40 different reactions that eventually result in an important precursor to lovastatin.

By understanding how this large assembly line works, Tang's team hopes to retune the assembly line to be able to produce other natural products something nature doesn't currently do.

"It's like having an assembly line with seven
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