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RagA, an mTORC1 activator, interacts with a hedgehog signaling protein, WDR35/IFT121.
Genes to Cells : Devoted to Molecular & Cellular Mechanisms 2018 December 21
Small Ras-like GTPases act as molecular switches for various signal transduction pathways. RagA, RagB/RagC, and RagD are small Ras-like GTPases that play regulatory roles in mTORC1. Lack of proper activation of mTORC1 can lead to diseases such as cancer and diabetes. In this study, we found an interaction between RagA and WDR35. Mutations of WDR35 may cause genetic diseases including Sensenbrenner syndrome. WDR35 seems to be a hedgehog signaling protein with a possible ciliary function and a possible upstream regulator of RagA. RagB is a homologue of RagA and is also associated with WDR35. WDR35 is present in the endoplasmic reticulum, but usually not in lysosomes, where Rag family proteins act as an mTORC1 switch. Overexpression of WDR35 results in decreased phosphorylation of ribosome S6 protein in a RagA-, RagB-, and RagC-dependent manner. Thus, WDR35 is associated with RagA, RagB, and RagC, and might negatively influence mTORC1 activity. This article is protected by copyright. All rights reserved.
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