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Oklahoma State University researchers make breakthrough against poxviruses
Date:1/23/2009

Stillwater, Okla. Smallpox has a nasty history throughout the world. Caused by poxviruses, smallpox is one of the few disease-causing agents against which the human body's immune system is ineffective in its defense.

A major breakthrough by Junpeng Deng, a structural biologist in the Division of Agricultural Sciences and Natural Resources (DASNR) at Oklahoma State University, and his first-year Ph.D. student, Brian Krumm, may be the first step towards a pharmaceutical medication for smallpox and the emerging human monkeypox.

The human immune system is rendered helpless against poxviruses partly because the viruses block a human immune molecule, interleukin-18 (IL-18), from sending out a signal to the immune system. The body acts as if everything is fine and the deadly disease takes over.

Deng and Krumm joined an ongoing project midway through 2007 and Krumm found what he was looking for in December 2008. They solved a three-dimensional crystal structure of a poxvirus protein in the act of disarming the IL-18.

"We capped a lot of others' research. This is additional information provided," said Krumm, who is credited as the major contributor to the research. "We also show many things through the structure that can't be revealed through traditional molecular biology and immunology."

The study is published in the Dec. 22 early online edition of the Proceedings of the National Academy of Sciences of the United States of America.

"We know now how the proteins communicate with each other," Deng said. "In the future, we can design a drug to stop the poxvirus from blocking the IL-18 protein."

As there is currently no medication for poxvirus-caused diseases, this research could aid national and international security efforts against potential poxvirus use as bioterrorism.

Deng called the finding an example of "killing two birds with one stone."

"At this time we only have very limit
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Contact: Sean Hubbard
sean.hubbard@okstate.edu
405-744-4490
Oklahoma State University
Source:Eurekalert

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