Protein: Myotubularin-related protein 13 (Inactive phosphatidylinositol 3-phosphatase 13) (SET-binding factor 2) (E9PXF8)
Organism: Mus musculus (Mouse)
Function: Guanine nucleotide exchange factor (GEF) which activates RAB21 and possibly RAB28 (By similarity). Promotes the exchange of GDP to GTP, converting inactive GDP-bound Rab proteins into their active GTP-bound form (By similarity). 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 (By similarity). Acts as an adapter for the phosphatase MTMR2. Increases MTMR2 catalytic activity towards phosphatidylinositol 3,5-bisphosphate and to a lesser extent towards phosphatidylinositol 3-phosphate.
Subcellular location: Cytoplasm {ECO:0000269|PubMed:16399794, ECO:0000269|PubMed:16750429, ECO:0000269|PubMed:23297362}. Cytoplasm, perinuclear region {ECO:0000269|PubMed:16750429}. Membrane {ECO:0000250|UniProtKB:Q86WG5}; Peripheral membrane protein {ECO:0000250|UniProtKB:Q86WG5}. Endosome membrane {ECO:0000269|PubMed:23297362}; Peripheral membrane protein {ECO:0000305}. Cell projection, axon {ECO:0000269|PubMed:23297362}. Note=Associated with membranes (By similarity). Localizes to vacuoles in hypo-osmotic conditions (PubMed:16399794). Membrane localization is likely to be mediated via its interaction with MTMR2 (PubMed:23297362). {ECO:0000250|UniProtKB:Q86WG5, ECO:0000269|PubMed:16399794, ECO:0000269|PubMed:23297362}.
Interaction partners:
- Phosphatidylinositol-3,5-bisphosphate 3-phosphatase MTMR2
- Polyphosphoinositide phosphatase
- SH3 domain and tetratricopeptide repeat-containing protein 2
- FYVE, RhoGEF and PH domain-containing protein 4
- Ras-related protein Rab-21
Sequence:
MARLADYFIVVGYDHEKPAGPGEGLGKIIQRFPQQDWDDTPFPQGIELFCQPGGWHLSRERKQPTFFVVVLTDIDSDRHYCSCLTFYEAEINLQGTKKEEIEGEEVSGLIQPAEVFAPKSLVLVSRLDYPEIFRACLGLIYTVYVDSMSVSLESLIANLCACLVPAAGGSQKLFSLGAGDRQLIQTPLHDSLPVTGTSVALLFQQLGIQNVLNLFCAVLTENKVLFHSASFQRLSDACRALESLMFPLKYSYPYIPILPAQLLEVLSSPTPFIIGVHSIFKTDVHELLDVIIADLDGGTIKIPECIHLSSLPEPLLHQTQSALSLILHPDLEVADHAFPPPRTALSHSKMLDKEVRAVFLRLFAQLFQGYRSCLQLIRIHAEPVIHFHKTAFLGQRGLVENDFLTKVLNGMAFAGFVSERGPPYRACDLFDELVAFEVERIKVEEKNPLKMIKHIRELAEQLFKNENPNPHMAFQKVPRPTEGSHLRVHILPFPKINEARVQELIQENLAKNQNAPPATRIEKKCVVPAGPPVVSIMEKVITVFNSAQRLEVVRNCISFIFENKTLETEKTLPAALRALKGKAARQCLTDELGLHVQQNRAILDHQQFDYIIRMMNCTLQDCSSLEEYNIAAALLPLTSAFYRKLAPGVSQFAYTCVQDHPIWTNQQFWETTFYNAVQEQVRSLYLSAKDDNHIPHLKQKLPDGQHQEKTAMDLAAEQLRLWPTLSKSTQQELVQHEESTVFSQAIHFANLMVNLLVPLDTSKNKLLRASAPGDWESGSNSIVTNSIAGSVAESYDTESGFEDSENSDVANSVVRFIARFIDKVCTESGVTQDHIRSLHCMIPGIVAMHIETLEAVHRESRRLPPIQKPKILRPALLPGEEIVCEGLRVLLDPDGREEATGGLLGGPQLLPAEGALFLTTYRILFRGTPHDQLVGEQTVVRSFPIASITKEKKITMQNQLQQSVQEGLQITSASFQLIKVAFDEEVSPEVVDIFKKQLMKFRYPQSIFSTFAFAAGQTTPQIILPKQKEKNTSFRTFSKTIVKGAKKAGKMTIGRQYLLKKRTGTIVEERVNRPGWNEEDDISVSDDSELPTSTTLKASEKSTMEQLVEKACFRDYQRLGLGTISGNSSRSKPEYFRVTASNRLYSLCRSYPGLLVIPQAVQDSSLPRVARCYRHNRLPVVCWKNSRSGTLLLRSGGFHGKGVVGLFKSQNSPQAVSTSSLESSSSIEQEKYLQALLTAVIVHQKLRGSSTLTVRPALALSPVHGYRDKSFTQSNPKSSAKEPVHNQGVWASLRSSTRLISSPTSFIDVGARLAGKDHSASFSNSTYLQNQLLKRQAALYIFGEKSQLRSSKVEFAFNCEFVPVEFHEIRQVKASFKKLMRACIPSTIPTDSEVTFLKALGDSEWFPQLHRIMQLAVVVSEVLENGSSVWVCLEEGWDITTQVTSLAQLLSDPFYRTIAGFRTLVEKEWLSFGHKFSQRSSLALNSQGGGFAPIFLQFLDCVHQVHNQYPTEFEFNLYYLKFLAFHYVSNRFKTFLLDSDYERLEHGTLFDDKGDKHAKKGVCIWECIDKMHTRSPIFFNYLYSPVEVEALKPNVNVSSLKKWDYYTEETLSAGPSYDWMMLTPKHFPYEESDVAGGAGPQSQRKTVWPCYDDVTCSQPDALTRLFSEIEKLEHKLNQTPERWHQLWEKVTTDLKEEPRTAHSLRHSAGSPGIASTNVPSYQKRPALHPLHRGLGEDQSTTTAPSNGVEHRAATLYSQYTSKNDENRSFEGTLYKRGALLKGWKPRWFVLDVTKHQLRYYDSGEDTSCKGHIDLAEVEMVIPAGPSMGAPKYTSDKAFFDLKTSKRVYNFCAQDGQSAQQWMDRIQSCISDA