Reference: Kimata Y and Kohno K (2011) Endoplasmic reticulum stress-sensing mechanisms in yeast and mammalian cells. Curr Opin Cell Biol 23(2):135-42

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Abstract


Upon endoplasmic reticulum (ER) stress, ER-located transmembrane stress sensors evoke diverse protective responses. Although ER stress-dependent activation of the sensor proteins is partly explained through their negative regulation by the ER-located chaperone BiP under non-stress conditions, each of the sensors is also regulated by distinct mechanism(s). For instance, yeast Ire1 is fully activated via its direct interaction with unfolded proteins accumulated in the ER. This insight is consistent with a classical notion that unfolded proteins per se trigger ER-stress responses, while various stress stimuli also seem to activate individual sensors independently of unfolded proteins and in a stimuli-specific manner. These properties may account for the different responses observed under different conditions in mammalian cells, which carry multiple ER-stress sensors.

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Journal Article | Research Support, Non-U.S. Gov't | Review
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Kimata Y, Kohno K
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