Rhomboid family pseudoproteases use the ER quality control machinery to regulate intercellular signaling.

Rhomboid family pseudoproteases use the ER quality control machinery to regulate intercellular signaling.
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DOI:
10.1016/j.cell.2011.02.047
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发表时间:
2011-04-01
期刊:
影响因子:
64.5
通讯作者:
Freeman M
Freeman M
中科院分区:
生物学1区
文献类型:
--
作者:
Zettl M;Adrain C;Strisovsky K;Lastun V;Freeman M

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Intramembrane proteolysis governs many cellular control processes, but little is known about how intramembrane proteases are regulated. iRhoms are a conserved subfamily of proteins related to rhomboid intramembrane serine proteases that lack key catalytic residues. We have used a combination of genetics and cell biology to determine that these “pseudoproteases” inhibit rhomboid-dependent signaling by the epidermal growth factor receptor pathway in Drosophila, thereby regulating sleep. iRhoms prevent the cleavage of potential rhomboid substrates by promoting their destabilization by endoplasmic reticulum (ER)-associated degradation; this mechanism has been conserved in mammalian cells. The exploitation of the intrinsic quality control machinery of the ER represents a new mode of regulation of intercellular signaling. Inactive cognates of enzymes are common, but their functions are mostly unclear; our data indicate that pseudoenzymes can readily evolve into regulatory proteins, suggesting that this may be a significant evolutionary mechanism. ► iRhoms are members of the rhomboid-like family that have lost protease activity ► iRhoms inhibit EGF receptor signaling in Drosophila, thereby regulating sleep ► iRhoms are ER localized and promote degradation (ERAD) of EGF ligands ► The cellular function of iRhoms is conserved in mammals
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