Myotubularin-related protein 13 - Q86WG5 (MTMRD_HUMAN)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

Guanine nucleotide exchange factor (GEF) which activates RAB21 and possibly RAB28 (PubMed:20937701, PubMed:25648148). Promotes the exchange of GDP to GTP, converting inactive GDP-bound Rab proteins into their active GTP-bound form (PubMed:20937701, PubMed:25648148). In response to starvation-induced autophagy, activates RAB21 which in turn binds to and regulates SNARE protein VAMP8 endolysosomal transport required for SNARE-mediated autophagosome-lysosome fusion (PubMed:25648148). Acts as an adapter for the phosphatase MTMR2 (By similarity). Increases MTMR2 catalytic activity towards phosphatidylinositol 3,5-bisphosphate and to a lesser extent towards phosphatidylinositol 3-phosphate (By similarity). UniProt
Pathway Maps
      ESCHER  BiGG
Subunit Structure
Homodimer (By similarity). Heterotetramer consisting of one MTMR2 dimer and one SBF2/MTMR13 dimer (PubMed:15998640). Interacts with class II PI3-kinase PIK3C2A (By similarity). Interacts (via DENN domain) with RAB21 (in GDP-bound form) in response to starvation; the interaction activates RAB21 (PubMed:25648148). Interacts with VAMP8 in response to starvation (PubMed:25648148). UniProt
The PH domain binds preferentially phosphatidylinositol 3,4,5-trisphosphate (By similarity). Appears to be dispensable for localization to membranes (By similarity). UniProt
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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