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Researchers create functioning artificial proteins using nature's rules

By examining how proteins have evolved, UT Southwestern Medical Center researchers have discovered a set of simple "rules" that nature appears to use to design proteins, rules the scientists have now employed to create artificial proteins that look and function just like their natural counterparts.

In two papers appearing in the Sept. 22 issue of the journal Nature, Dr. Rama Ranganathan, associate professor of pharmacology, and his colleagues detail a new method for creating artificial proteins based only on information they derived from analyzing certain characteristics that individual natural proteins have in common with each other.

"The goal of our research was not to find another way to make artificial proteins in the lab, but to discover the rules that nature and evolution have used to design proteins," Dr. Ranganathan said. "The rules we have extracted from the evolutionary record of proteins contain a substantial fraction of the information required to rebuild modern-day proteins. We're building solutions so close that, at least in a test tube, we can't tell them apart from natural proteins."

Dr. Ranganathan said there could still be many small differences between the artificial proteins and the natural ones, and further testing would need to be done to determine whether they work within an actual organism.

"Our work suggests that modern-day proteins have likely inherited much of the information specifying their structure and basic aspects of function from their ancestors, but it is also possible that they have been fine-tuned over time to have their own idiosyncratic features in specific cells," said Dr. Ranganathan, who also is a Howard Hughes Medical Institute (HHMI) investigator. "We are suggesting that the functions proteins have today are the result of fine-tuning a basic ancestral template that we have now figured out."

Proteins, which carry out the body's life functions, are composed of molecules called amino a
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Source:UT Southwestern Medical Center


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