I?B kinase ß (IKBKB) mutations in lymphomas that constitutively activate canonical nuclear factor ?B (NF?B) signaling.
Kai X, Chellappa V, Donado C, Reyon D, Sekigami Y, Ataca D, Louissaint A, Mattoo H, Joung JK, Pillai S.
J Biol Chem
Cancer Research/Cell Biology
Immunotherapy / Hematology
Cells used in publication:
Tissue Origin: blood
2x10e6 BJAB cells, Nucleofector Solution V, 0.5µg of each TALEn and 1µg of pUC with a mutagenized insert per sample program E-23/E-023 (Nucleofector I/Nucleofector II)
Somatic mutations altering lysine 171 of the IKBKB gene that encodes (IKKß), the critical activating kinase in canonical (NF?B) signaling, have been described in splenic marginal zone lymphomas and multiple myeloma. Lysine 171 forms part of a cationic pocket that interacts with the activation loop phosphate in the activated wild type kinase. We show here that K171E IKKß and K171T IKKß represent kinases that are constitutively active even in the absence of activation loop phosphorylation. Predictive modeling and biochemical studies establish why mutations in a positively charged residue in the cationic pocket of an activation loop phosphorylation-dependent kinase result in constitutive activation. Transcription activator-like effector nuclease-based knock-in mutagenesis provides evidence from a B lymphoid context that K171E IKKß contributes to lymphomagenesis.
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