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9.A.58.  The Maintenance of Mitochondrial Morphology  (MMM) Family 

The MMM proteins are components of ERMES/MDM complexes, which serve as a molecular tethers to interconnect the endoplasmic reticulum and mitochondria. Components of this complex are involved in the control of mitochondrial shape and protein biogenesis and may function in phospholipid exchange. The MDM12-MMM1 subcomplex functions in the major beta-barrel assembly pathway that is responsible for biogenesis of all outer membrane beta-barrel proteins, and acts in a late step after the SAM complex. The MDM10-MDM12-MMM1 subcomplex further acts in the TOM40-specific pathway after the action of the MDM12-MMM1 complex. These complexes are essential for establishing and maintaining the structure of mitochondria and for the maintenance of mtDNA nucleoids (Burgess et al. 1994; Boldogh et al. 1998; Hobbs et al. 2001; Meisinger et al. 2007).  These proteins are believed to be members of the TULIP superfamily (see also TC# 1.C.40 and 9.A.57) (Alva and Lupas 2016).

References associated with 9.A.58 family:

Alva, V. and A.N. Lupas. (2016). The TULIP superfamily of eukaryotic lipid-binding proteins as a mediator of lipid sensing and transport. Biochim. Biophys. Acta. [Epub: Ahead of Print] 26825693
Boldogh, I., N. Vojtov, S. Karmon, and L.A. Pon. (1998). Interaction between mitochondria and the actin cytoskeleton in budding yeast requires two integral mitochondrial outer membrane proteins, Mmm1p and Mdm10p. J. Cell Biol. 141: 1371-1381. 9628893
Burgess, S.M., M. Delannoy, and R.E. Jensen. (1994). MMM1 encodes a mitochondrial outer membrane protein essential for establishing and maintaining the structure of yeast mitochondria. J. Cell Biol. 126: 1375-1391. 8089172
Hobbs, A.E., M. Srinivasan, J.M. McCaffery, and R.E. Jensen. (2001). Mmm1p, a mitochondrial outer membrane protein, is connected to mitochondrial DNA (mtDNA) nucleoids and required for mtDNA stability. J. Cell Biol. 152: 401-410. 11266455
Kornmann, B., E. Currie, S.R. Collins, M. Schuldiner, J. Nunnari, J.S. Weissman, and P. Walter. (2009). An ER-mitochondria tethering complex revealed by a synthetic biology screen. Science 325: 477-481. 19556461
Meisinger, C., S. Pfannschmidt, M. Rissler, D. Milenkovic, T. Becker, D. Stojanovski, M.J. Youngman, R.E. Jensen, A. Chacinska, B. Guiard, N. Pfanner, and N. Wiedemann. (2007). The morphology proteins Mdm12/Mmm1 function in the major β-barrel assembly pathway of mitochondria. EMBO. J. 26: 2229-2239. 17410204