This family includes members such as plant proteins AtDMPs 1-10 (Arabidopsis thaliana DUF679 domain membrane proteins 1 -10) [1]. The AtDMP proteins are predicted to have four transmembrane spans, with cytosolic amino- and carboxy-termini. DMP1 is a membrane protein that may be involved in membrane fission during breakdown of the ER and the tonoplast during leaf senescence and in membrane fusion during vacuole biogenesis in roots [2]. Several DMP proteins are expressed in senescing organs (DMP1, -3, -4) or tissues that will stall later in development (DMP1, -2, -4, -7). These expression patterns strongly suggest involvement of several DMPs in various programmed cell death processes, e.g. senescence, dehiscence and abscission [1]. AtDMP8 and AtDMP9 however, have been shown to facilitate gamete fusion during double fertilisation in flowering plants [3].

1: Expression, localisation and phylogeny of a novel family of plant-specific membrane proteins. Kasaras A, Kunze R; Plant Biol (Stuttg). 2010;12:140-152. PMID:20712629

2: Arabidopsis senescence-associated protein DMP1 is involved in membrane remodeling of the ER and tonoplast. Kasaras A, Melzer M, Kunze R; BMC Plant Biol. 2012;12:54. PMID:22530652

3: Gamete fusion is facilitated by two sperm cell-expressed DUF679 membrane proteins. Cyprys P, Lindemeier M, Sprunck S; Nat Plants. 2019;5:253-257. PMID:30850817