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New information on the waste-disposal units of living cells
Date:1/11/2012

tingly, the ubiquitin tag has to be removed before the protein can be translocated into the proteasome's destruction chamber, so the lid also contains de-ubiquitination enzymes that remove the tags after the protein has engaged with the proteasome."

The proteasome regulatory particle's base contains six distinct AAA+ ATPases that form the hetero-hexameric ring, which serves as the molecular motor of the proteasome.

"We predict that the ATPases use the energy of ATP binding and hydrolysis to exert a pulling force on engaged proteins, unfolding and translocating them through a narrow central pore and into the degradation chamber," Martin says. "The steps in the proteasome process from protein recognition to de-ubiquitination and degradation have to be very highly coordinated in time and space. Locating all of these components and identifying their relative orientations has been very telling about how the processes are coordinated with each other."

Nogales credits the protein expression system developed by Martin and his research group, in which proteins are expressed and assembled in bacteria, as being critical to the success of this research.

"Until now researchers had to work with purified protein complexes from the cell, which could not be manipulated or modified in any way," she says. "Andy Martin's new heterologous expression system allows for the manipulation and dissection of protein functions. For our studies it was crucial to generate lid sub-complexes that had one marker at a time in each of the subunits so that we could determine the position of each protein within the lid. With this new system we generated truncations, deletions and fusion constructs that were used to localize individual subunits and delineate their boundaries within the lid."


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Contact: Lynn Yarris
lcyarris@lbl.gov
510-486-5375
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

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