MAPK signaling to the early secretory pathway revealed by kinase/phosphatase functional screening.

MAPK signaling to the early secretory pathway revealed by kinase/phosphatase functional screening.
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DOI:
10.1083/jcb.200912082
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发表时间:
2010-06-14
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Hauri HP
Hauri HP
中科院分区:
其他
文献类型:
--
作者:
Farhan H;Wendeler MW;Mitrovic S;Fava E;Silberberg Y;Sharan R;Zerial M;Hauri HP

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An RNAi screen determines that the early secretory pathway is subject to phosphoregulation via a variety of signaling pathways, including a link between growth factor signaling and ER export. To what extent the secretory pathway is regulated by cellular signaling is unknown. In this study, we used RNA interference to explore the function of human kinases and phosphatases in controlling the organization of and trafficking within the secretory pathway. We identified 122 kinases/phosphatases that affect endoplasmic reticulum (ER) export, ER exit sites (ERESs), and/or the Golgi apparatus. Numerous kinases/phosphatases regulate the number of ERESs and ER to Golgi protein trafficking. Among the pathways identified, the Raf–MEK (MAPK/ERK [extracellular signal-regulated kinase] kinase)–ERK cascade, including its regulatory proteins CNK1 (connector enhancer of the kinase suppressor of Ras-1) and neurofibromin, controls the number of ERESs via ERK2, which targets Sec16, a key regulator of ERESs and COPII (coat protein II) vesicle biogenesis. Our analysis reveals an unanticipated complexity of kinase/phosphatase-mediated regulation of the secretory pathway, uncovering a link between growth factor signaling and ER export.
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