Cancerous inhibitor of PP2A (CIP2A) functions via protein binding through interactions with many other proteins including MYC, polo like kinase (PLK1) and NIMA protein. t is an inhibitor of PP2A, a tumour suppressor. CIP2A binds to PP2A and inhibits its phosphatase functions resulting in tumourigenesis transformation of cells [1,2]. This is the N-terminal HEAT repeats domain, which can be subdivided into tip, stem and C-dimerisation subdomains; the latter is responsible for CIP2A dimerisation [2].

1: Oncogenic nexus of cancerous inhibitor of protein phosphatase 2A (CIP2A): an oncoprotein with many hands. De P, Carlson J, Leyland-Jones B, Dey N; Oncotarget. 2014;5:4581-4602. PMID:25015035

2: Oncoprotein CIP2A is stabilized via interaction with tumor suppressor PP2A/B56. Wang J, Okkeri J, Pavic K, Wang Z, Kauko O, Halonen T, Sarek G, Ojala PM, Rao Z, Xu W, Westermarck J; EMBO Rep. 2017;18:437-450. PMID:28174209