Transmembrane Protein 57 (TMEM57)

TMEM57 has 5 domains, including an N-terminal LAG1 domain and a central ERM-myosin filament domain. The LAG1 domain contains 3 putative transmembrane domains. In situ hybridization of mouse embryos showed that Tmem57 was brain specific.

It was primarily associated with postmigratory neurons and less so with neural proliferating cells, and Tmem57 expression was progressively downregulated during brain maturation. Fluorescence-tagged Tmem57 outlined the nuclear membrane when expressed in nonneuronal cells. In primary hippocampal neurons, Tmem57 was found in neurites and their terminals, and it partially colocalized with synapsin-1 (SYN1), a presynaptic marker.