APC_N_CC is the N-terminal, coiled-coil dimerisation domain of the adenomatosis polyposis coli (APC) tumour-repressor proteins. It plays a key role in the regulation of cellular levels of the oncogene product beta-catenin. Coiled-coil regions are binding repeats that in this case bind to the armadillo repeat region of beta-catenin [1].

1: Crystal structure of the amino-terminal coiled-coil domain of the APC tumor suppressor. Day CL, Alber T; J Mol Biol. 2000;301:147-156. PMID:10926498