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    Friday, 11 October 2013 09:37

    Better Protein Creation May Be Secret of Longevity for the World's Longest-Living Rodent

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    naked mole ratNaked mole rats have what any animal would want. They live long lives—about 30 years—and stay healthy until the very end. Now biologists at the University of Rochester have new insights into the animal's longevity—better-constructed proteins.

    Proteins are involved in nearly all functions of an animal cell, and consequently, are essential to all organisms. But before proteins can do their job, they must fold into the appropriate shapes that allow them to connect to and interact with other structures in the cell. In a paper published this week in the Proceedings of the National Academy of Sciences, Vera Gorbunova and Andrei Seluanov describe their discovery of the process in naked mole rats that leads to virtually perfect proteins.

    "While this is basic research," said Gorbunova, "we hope our findings encourage further studies on better protein synthesis."

    Their work focused on naked mole rat ribosomes—the site of protein creation in the animal's cells—and began by happenstance. Gorbunova and Seluanov were working with ribosome RNA (rRNA) when they made a discovery. After applying a dye to a sample, they studied it under ultraviolet light only to find three dark bands—representing concentrations of different rRNA molecules—not the two bands that are characteristic of all other animals, suggesting that there is a "hidden break" in the naked mole rat rRNA. Since rRNA is an essential part of the protein-creation mechanism, the two biologists decided to see if the broken rRNA affects the quality of naked mole rat proteins.

    Ribosome RNA strands act as scaffolds on the ribosome, a protein synthesis machine. Changing the shape of the scaffold can have a profound effect on the organization of the ribosome parts.

    Gorbunova and Seluanov discovered that the naked mole rat's rRNA scaffold is indeed unique. The rRNA strands split at two specific locations and discard the intervening segment. Instead of floating off on their own, the two remaining pieces from each strand stay close to each other and act as a scaffold on which ribosomal proteins are assembled to create a functional ribosome—a molecular machine that puts amino acids together to create proteins. And the results are impressive.

    When the ribosome connects amino acids together to create a protein a mistake is occasionally introduced when an incorrect amino acid is inserted. Gorbunova and Seluanov found that the proteins made by naked mole rat cells are up to 40 times less likely to contain such mistakes than the proteins made by mouse cells.

    "This is important because proteins with no aberrations help the body to function more efficiently," said Seluanov.

    The next step for the biologists is to split mouse rRNA in the same way to see if it would lead to improved protein creation.

    The two biologists hope their work will eventually result in pharmaceutical treatments that modulate protein synthesis in humans, though any medical solution is a long way off.

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