Download MendeleyA PH-like domain of the Rab12 guanine nucleotide exchange factor DENND3 binds actin and is required for autophagy.
Xu, J., Kozlov, G., McPherson, P.S., Gehring, K.(2018) J Biological Chem 293: 4566-4574
- PubMed: 29352104 Search on PubMedSearch on PubMed Central
- DOI: https://doi.org/10.1074/jbc.RA117.001446
- Primary Citation Related Structures:
6B3Y - PubMed Abstract:
Rab GTPases are key regulators of membrane trafficking, and many are activated by guanine nucleotide exchange factors bearing a d ifferentially e xpressed in n ormal and n eoplastic cells (DENN) domain. By activating the small GTPase Rab12, DENN domain-containing protein 3 (DENND3) functions in autophagy. Here, we identified a structural domain (which we name PHenn) containing a pleckstrin homology subdomain that binds actin and is required for DENND3 function in autophagy. We found that a hydrophobic patch on an extended β-turn of the PHenn domain mediates an intramolecular interaction with the DENN domain of DENND3. We also show that DENND3 binds actin through a surface of positively charged residues on the PHenn domain. Substitutions that blocked either DENN or actin binding compromised the role of DENND3 in autophagy. These results provide new mechanistic insight into the structural determinants regulating DENND3 in autophagy and lay the foundation for future investigations of the DENN protein family.
- From the Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec H3A 2B4, Canada and.
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