Enables transmembrane transporter binding activity. Acts upstream of or within endoplasmic reticulum calcium ion homeostasis and negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway. Located in Golgi apparatus and endoplasmic reticulum. Is expressed in cortical plate and genitourinary system. Orthologous to human GRINA (glutamate ionotropic receptor NMDA type subunit associated protein 1). [provided by Alliance of Genome Resources, Apr 2022]