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Cancer scientists determine mechanism of 1 of the most powerful tumor-suppressor proteins, Chd5
Date:1/10/2013

Cold Spring Harbor, NY A team of cancer researchers at Cold Spring Harbor Laboratory (CSHL) has solved the mystery of how one of the most powerful of the body's natural tumor-suppressing proteins, called Chd5, exerts its beneficial effects.

The findings, published online today in the journal Cell Reports, are important because Chd5 engages processes fundamental to cancer prevention. Conversely, when Chd5 is mutated or missing, an important door is opened to cancer initiation.

"For this reason, figuring out the mechanics of how Chd5 works to prevent cancer can directly impact the treatment of a diverse array of human cancers," says Alea A. Mills, Ph.D., team leader and Professor at CSHL. "Until now, we didn't understand very much about this process."

Since the time that Mills first discovered Chd5 as a tumor suppressor in 2007 and reported that it facilitates the expression of a tumor-suppressive network acting as a "master switch" for several tumor suppressor proteins Chd5 has been shown to predict survival following anticancer therapy. That is, patients struck with malignancies such as neuroblastoma, gall bladder cancer, and ovarian cancer live much longer if they have high levels of Chd5.

Now, Mills' team has discovered that Chd5's beneficial activity occurs when the protein binds to another protein called histone H3, which helps bundle the genetic material in the nucleus of cells.

Her team began their work knowing that Chd5 was a member of a family of proteins having at least nine members. Called chromatin remodeling proteins, they are involved in the immensely important job of shaping and chemically marking the highly compressed bundles of DNA and protein that biologists call chromatin.

Among other things, the degree to which chromatin is compressed helps determine whether particular genes among our total complement of 21,000 are either accessible or inaccessible to molecular machines
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Contact: Peter Tarr
tarr@cshl.edu
516-367-8455
Cold Spring Harbor Laboratory
Source:Eurekalert

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