GTPase tethering membranes through formation of trans-homooligomers and mediating homotypic fusion of endoplasmic reticulum membranes. Functions in endoplasmic reticulum tubular network biogenesis ( ).
Subcellular locations: Endoplasmic reticulum membrane
Localizes at endoplasmic reticulum (ER) three-way tubular junctions .
Expressed in peripheral tissues (at protein level).