The function of ENSG00000120049 (KCNIP2, potassium voltage-gated channel interacting protein 2) is as follows. Regulatory subunit of Kv4/D (Shal)-type voltage-gated rapidly inactivating A-type potassium channels (PubMed:10676964, PubMed:11287421, PubMed:11684073, PubMed:12297301, PubMed:14623880, PubMed:34997220). Modulates channel density, inactivation kinetics and rate of recovery from inactivation in a calcium-dependent and isoform- specific manner (PubMed:10676964, PubMed:11287421, PubMed:11684073, PubMed:12297301, PubMed:14623880, PubMed:34997220). Involved in KCND2 and KCND3 trafficking to the cell surface (PubMed:12829703). May be required for the expression of I(To) currents in the heart (By similarity). {ECO:0000250|UniProtKB:Q9JJ69, ECO:0000269|PubMed:10676964, ECO:0000269|PubMed:11287421, ECO:0000269|PubMed:11684073, ECO:0000269|PubMed:12297301, ECO:0000269|PubMed:12829703, ECO:0000269|PubMed:14623880, ECO:0000269|PubMed:34997220}.