MMM1 is conserved from plants to humans. MMM1 is an integral ER protein. It is N-glycosylated, and forms a complex with Mdm10, Mdm12and Mdm34 to tether the mitochondria to the endoplasmic reticulum [6].

1: A protein complex containing Mdm10p, Mdm12p, and Mmm1p links mitochondrial membranes and DNA to the cytoskeleton-based segregation machinery. Boldogh IR, Nowakowski DW, Yang HC, Chung H, Karmon S, Royes P, Pon LA; Mol Biol Cell. 2003;14:4618-4627. PMID:13679517

2: Mmm1p, a mitochondrial outer membrane protein, is connected to mitochondrial DNA\t\t\t\t (mtDNA) nucleoids and required for mtDNA stability. Hobbs AE, Srinivasan M, McCaffery JM, Jensen RE; J Cell Biol. 2001;152:401-410. PMID:11266455

3: Mmm2p, a mitochondrial outer membrane protein required for yeast mitochondrial shape and maintenance of mtDNA nucleoids. Youngman MJ, Hobbs AE, Burgess SM, Srinivasan M, Jensen RE; J Cell Biol. 2004;164:677-688. PMID:14981098

4: The morphology proteins Mdm12/Mmm1 function in the major beta-barrel assembly pathway of mitochondria. Meisinger C, Pfannschmidt S, Rissler M, Milenkovic D, Becker T, Stojanovski D, Youngman MJ, Jensen RE, Chacinska A, Guiard B, Pfanner N, Wiedemann N; EMBO J. 2007;26:2229-2239. PMID:17410204

5: An ER-mitochondria tethering complex revealed by a synthetic biology screen. Kornmann B, Currie E, Collins SR, Schuldiner M, Nunnari J, Weissman JS, Walter P; Science. 2009;325:477-481. PMID:19556461

6: Diverse membrane-associated proteins contain a novel SMP domain. Lee I, Hong W; FASEB J. 2006;20:202-206. PMID:16449791