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Role of Rab GTPases and their interacting proteins in mediating metabolic signalling and regulation

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Abstract

The vesicular transport pathways, which shuttle materials to and from the cell surface and within the cell, and the metabolic (growth factor and nutrient) signalling pathways, which integrate a variety of extracellular and intracellular signals to mediate growth, proliferation or survival, are both important for cellular physiology. There is evidence to suggest that the transport and metabolic signalling pathways intersect—vesicular transport can affect the regulation of metabolic signals and vice versa. The Rab family GTPases regulate the specificity of vesicular transport steps in the cell. Together with their interacting proteins, Rabs would likely constitute the points of intersection between vesicular transport and metabolic signalling pathways. Examples of these points would include growth factor signalling, glucose and lipid metabolism, as well as autophagy. Many of these processes involve mechanistic/mammalian target of rapamycin (mTOR) complex 1 (mTORC1) in downstream cascades, or are regulated by TORC signalling. A general functionality of the vesicular transport processes controlled by the Rabs is also important for spatial and temporal regulation of the transmission of metabolic signals between the cell surface and the nucleus. In other cases, specific Rabs and their interacting proteins are known to function in recruiting metabolism-related proteins to target membranes, or may compete with other factors in the TORC signalling pathway as a means of metabolic regulation. We review and discuss herein examples of how Rabs and their interacting proteins can mediate metabolic signalling and regulation in cells.

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Authors and Affiliations

  1. Department of Biochemistry, Yong Loo Lin School of Medicine, National University Health System, 8 Medical Drive, Singapore, 117597, Singapore

    Christelle En Lin Chua & Bor Luen Tang

  2. NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 8 Medical Drive, Singapore, 117597, Singapore

    Christelle En Lin Chua & Bor Luen Tang

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  1. Christelle En Lin Chua
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  2. Bor Luen Tang
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Correspondence to Christelle En Lin Chua.

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Chua, C.E.L., Tang, B.L. Role of Rab GTPases and their interacting proteins in mediating metabolic signalling and regulation. Cell. Mol. Life Sci. 72, 2289–2304 (2015). https://doi.org/10.1007/s00018-015-1862-x

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  • DOI: https://doi.org/10.1007/s00018-015-1862-x

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