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Biologists engineer algae to make complex anti-cancer 'designer' drug

Biologists at UC San Diego have succeeded in genetically engineering algae to produce a complex and expensive human therapeutic drug used to treat cancer.

Their achievement, detailed in a paper in this week's early online issue of The Proceedings of the National Academy of Sciences, opens the door for making these and other "designer" proteins in larger quantities and much more cheaply than can now be made from mammalian cells.

"Because we can make the exact same drug in algae, we have the opportunity to drive down the price down dramatically," said Stephen Mayfield, a professor of biology at UC San Diego and director of the San Diego Center for Algae Biotechnology or SD-CAB, a consortium of research institutions that is also working to develop new biofuels from algae. Their method could even be used to make novel complex designer drugs that can't be produced in any other systems--drugs that could be used to treat cancer or other human diseases in new ways.

"You can't make these drugs in bacteria, because bacteria are incapable of folding these proteins into these complex, three-dimensional shapes," said Mayfield. "And you can't make these proteins in mammalian cells because the toxin would kill them."

The advance is the culmination of seven years of work in Mayfield's laboratory to demonstrate that Chlamydomonas reinhardtii, a green alga used widely in biology laboratories as a genetic model organism, can produce a wide range of human therapeutic proteins in greater quantity and more cheaply than bacteria or mammalian cells.

Mayfield and his colleagues achieved their first breakthrough five years ago when they demonstrated they could produce a mammalian serum amyloid protein in algae. The following year, they succeeded in getting algae to produce a human antibody protein. In 2010, they demonstrated that more complex proteinshuman therapeutic drugs, such as human vascular endothelial growth factor, or VEGF, used to treat pati

Contact: Kim McDonald
University of California - San Diego

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