Cleavage of NIK by the API2-MALT1 Fusion Oncoprotein Leads to Noncanonical NF-{kappa}B Activation

ABSTRACT: Proper regulation of nuclear factor κB (NF-κB) transcriptional activity is required for normal lymphocyte function, and deregulated NF-κB signaling can facilitate lymphomagenesis. We demonstrate that the API2-MALT1 fusion oncoprotein created by the recurrent t(11;18)(q21;q21) in mucosa-associated lymphoid tissue (MALT) lymphoma induces proteolytic cleavage of NF-κB–inducing kinase (NIK) at arginine 325. NIK cleavage requires the concerted actions of both fusion partners and generates a C-terminal NIK fragment that retains kinase activity and is resistant to proteasomal degradation. The resulting deregulated NIK activity is associated with constitutive noncanonical NF-κB signaling, enhanced B cell adhesion, and apoptosis resistance. Our study reveals the gain-of-function proteolytic activit

ORGANISM(S): Homo sapiens

SUBMITTER: Rifat Hamoudi 

PROVIDER: E-GEOD-25527 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress