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Phosphorylation alters Bim‐mediated Mcl‐1 stabilization and priming
Author(s) -
ConagePough Jason E.,
Boise Lawrence H.
Publication year - 2018
Publication title -
the febs journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 204
eISSN - 1742-4658
pISSN - 1742-464X
DOI - 10.1111/febs.14505
Subject(s) - phosphorylation , microbiology and biotechnology , chemistry , protein stability , biology
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 ‐ WM 1 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.