Mediates zinc uptake. May function as a major endogenous zinc uptake transporter in many cells of the body. Responsible for the rapid uptake and accumulation of physiologically effective zinc in prostate cells. Shows a vesicular localization corresponding partially to the endoplasmic reticulum in several epithelial cell lines. Ubiquitous. Expressed in most adult and fetal tissues including the epidermis. Inhibited by Ni(2+) ions. Fe(2+) ions do not inhibit zinc uptake. Belongs to the ZIP transporter (TC 2.A.5) family.