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Updated: Feb 10, 2026

Cardiac Muscle-cell Based Actuator and Self-stabilizing Biorobot - PART 1
Published on: July 11, 2017
Phosphorylation alters Bim-mediated Mcl-1 stabilization and priming
Jason E Conage-Pough1,2, Lawrence H Boise2
1Cancer Biology Graduate Program, Winship Cancer Institute, Emory University, Atlanta, GA, USA.
Abstract:
Mcl-1 is a highly labile protein, subject to extensive post-translational regulation. This distinguishes Mcl-1 from other antiapoptotic proteins and necessitates further study to better understand how interactions with proapoptotic Bcl-2 proteins affect its regulation. One such protein, Bim, is known to stabilize Mcl-1, and Bim phosphorylation has been associated with increased Mcl-1 binding. Consequently, we investigated the potential impact of Bim phosphorylation on Mcl-1 stability. We found that Bim stabilizes and primes Mcl-1 in RPCI-WM1 cells and is constitutively phosphorylated. Additionally, introduction of several phospho-mimetic and unphosphosphorylateable Bim mutations resulted in altered Mcl-1 stability and distinct Bim binding to antiapoptotic proteins. These findings suggest Bim phosphorylation not only regulates Mcl-1 stability but also is a potential mechanism for enforcing Mcl-1 dependence.
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