Journal
FREE RADICAL BIOLOGY AND MEDICINE
Volume 83, Issue -, Pages 323-330Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.freeradbiomed.2015.02.020
Keywords
Protein secretion; Endoplasmic reticulum; Protein quality control; Disulfide bonds; ERp44; IgM; Redox control; Free radicals
Funding
- Telethon [GGP11077]
- Associazione Italiana Ricerca sul Cancro (AIRC) [IG 10721, 5 x 1000, 9965]
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In multicellular organisms, some cells are given the task of secreting huge quantities of proteins. To comply with their duty, they generally equip themselves with a highly developed endoplasmic reticulum (ER) and downstream organelles in the secretory pathway. These professional secretors face paramount proteostatic challenges in that they need to couple efficiency and fidelity in their secretory processes. On one hand, stringent quality control (QC) mechanisms operate from the ER onward to check the integrity of the secretome. On the other, the pressure to secrete can be overwhelming, as for instance on antibody-producing cells during infection. Maintaining homeostasis is particularly hard when the products to be released contain disulfide bonds, because oxidative folding entails production of reactive oxygen species. How are redox homeostasis (redoxtasis) and proteostasis maintained despite the massive fluxes of cargo proteins traversing the pathway? Here we describe recent findings on how ERp44, a multifunctional chaperone of the secretory pathway, can modulate these processes integrating protein QC, redoxtasis, and calcium signaling. (C) 2015 Elsevier Inc. All tights reserved.
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