The function of JPT2 (Jupiter microtubule associated homolog 2, ENSG00000206053) is as follows. Nicotinic acid adenine dinucleotide phosphate (NAADP) binding protein required for NAADP-evoked intracellular calcium release (PubMed:33758061, PubMed:33758062). Confers NAADP-sensitivity to the two pore channels (TPCs) complex (PubMed:33758061). Enables NAADP to activate Ca(2+) release from the endoplasmic reticulum through ryanodine receptors (PubMed:33758062). {ECO:0000269|PubMed:33758061, ECO:0000269|PubMed:33758062}. (Microbial infection) Involved in the endolysosomal trafficking of human coronavirus SARS-CoV-2. .