摘要
Apoptosis signal-regulating kinase 1 (ASK1)is an important mediator of the cell stress response pathways.Because of its central role in regulating cell death,the activity of ASK1 is tightly regulated by protein-protein interactions and post-translational modifications.Deregulation of ASK1 activity has been linked to human diseases,such as neurological disorders and cancer.Here we describe the identification and characterization of large tumor suppressor 2 (LATS2)as a novel binding partner for ASK1.LATS2 is a core kinase in the Hippo signaling pathway and is commonly downregulated in cancer.We found that LATS2 interacts with ASK1 and increases ASK1-mediated signaUng to promote apoptosis and activate the iNK mitogen-activated protein kinase (MAPK).This change in MAPK signaling is dependent on the catalytic activity of ASK1 but does not require LATS2 kinase activity. This work identifies a novel role for LATS2 as a positive regulator of the ASK1-MKK-JNK signaling pathway and establishes a kinase-independent function of LATS2 that may be part of the intricate regulatory system for cellular response to diverse stress signals.
