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2-way traffic enable proteins to get where needed, avoid disease
Date:11/25/2013

or that could go in the opposite direction, delivery, or localization, of the cargo mRNA already en-route was compromised.

"What we have seen is that there are many things that can reverse that track," Gonsalvez said. "If they can only go in one direction, they can bump into something, like a stray organelle, and get stuck."

Motor proteins have long been known to haul mRNA up and down the cell's cytoskeleton, which essentially functions as an internal roadway for the cell. Gonsalvez recently received a $1.4 million grant from the National Institutes of Health to fill in other important knowledge gaps about the journey, like how the motor proteins know which mRNA to transport, because not all mRNA needs to be localized.

He likens the routing system to a ZIP code and thinks proteins are again key, but in this case, they are bound to the mRNA, flagging it for travel. "Something is telling the cell that this message is different," he said.

In the case of Fragile X syndrome, for example, he suspects that one or more proteins that should be bound to mRNA are missing so the cell can't tell the messenger it needs to be moved.

Another question Gonsalvez wants to answer is how mRNA holds on for the ride since the motor protein won't bind with it directly.

"These are not easy questions but the thought is once we understand the answers, we will understand why, when you have a defect in this process, you have a disease pathology," Gonsalvez said.

He notes that transportation of mRNA occurs lifelong, since proteins have a limited life and are constantly being replaced.

His research model is the comparatively simple fruit fly in which the technology is available to selectively knock out motor proteins in specific cells. His published research was funded by the American Cancer Society and the NIH.


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Contact: Toni Baker
tbaker@gru.edu
706-721-4421
Medical College of Georgia at Georgia Regents University
Source:Eurekalert  

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