Escrt-III Binding Protein Mitd1 is Involved in Cytokinesis and Has an Unanticipated Pld Fold that Binds Membranes.Hadders, M.A., Agromayor, M., Obita, T., Perisic, O., Caballe, A., Kloc, M., Lamers, M.H., Williams, R.L., Martin-Serrano, J.
(2012) Proc Natl Acad Sci U S A 109: 17424
- PubMed: 23045692
- DOI: 10.1073/pnas.1206839109
- Primary Citation of Related Structures:
2YMB, 4A5X, 4A5Z
- PubMed Abstract:
The endosomal sorting complexes required for transport (ESCRT) proteins have a critical function in abscission, the final separation of the daughter cells during cytokinesis. Here, we describe the structure and function of a previously uncharacterize ...
The endosomal sorting complexes required for transport (ESCRT) proteins have a critical function in abscission, the final separation of the daughter cells during cytokinesis. Here, we describe the structure and function of a previously uncharacterized ESCRT-III interacting protein, MIT-domain containing protein 1 (MITD1). Crystal structures of MITD1 reveal a dimer, with a microtubule-interacting and trafficking (MIT) domain at the N terminus and a unique, unanticipated phospholipase D-like (PLD) domain at the C terminus that binds membranes. We show that the MIT domain binds to a subset of ESCRT-III subunits and that this interaction mediates MITD1 recruitment to the midbody during cytokinesis. Depletion of MITD1 causes a distinct cytokinetic phenotype consistent with destabilization of the midbody and abscission failure. These results suggest a model whereby MITD1 coordinates the activity of ESCRT-III during abscission with earlier events in the final stages of cell division.
Laboratory of Molecular Biology, Medical Research Council, Cambridge CB2 0QH, United Kingdom.