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DegS, the periplasmic stress sensor, becomes activated when its PDZ domain recognizes the improperly exposed C-terminal sequences of outer membrane porins. This interaction relieves the inhibition of the neighboring protease domain of DegS, triggering a proteolysis cascade that leads to the σ E -driven expression of periplasmic chaperones.
The role of cytosolic factors in protein targeting to mitochondria is poorly understood. Here, we show that in mammals, the cytosolic chaperones Hsp90 and Hsp70 dock onto a specialized TPR domain in the import receptor Tom70 at the outer mitochondrial membrane. This interaction serves to deliver a set of preproteins to the receptor for subsequent membrane translocation dependent on the Hsp90 ATPase...
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