Acts as a zinc transporter involved in intracellular zinc homeostasis. Functions as a secondary coactivator for nuclear receptors by cooperating with p160 coactivators subtypes. Plays a role in transcriptional activation of Wnt-responsive genes. Interacts with GRIP1, ESR1, AR and CTNNB1. Mainly in the cytoplasm. Partial co-localization with endoplasmic reticulum. Belongs to the cation diffusion facilitator (CDF) transporter (TC 2.A.4) family. SLC30A subfamily.