Structural and Dynamic Effects of PTEN C-Terminal Tail Phosphorylation.
Structural and Dynamic Effects of PTEN C-Terminal Tail Phosphorylation.
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DOI:
10.1021/acs.jcim.2c00441
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发表时间:
2022-09-12
影响因子:
5.6
通讯作者:
Eng, Charis
中科院分区:
文献类型:
--
作者:
Smith, Iris N.;Dawson, Jennifer E.;Krieger, James;Thacker, Stetson;Bahar, Ivet;Eng, Charis
The phosphatase and tensin homologue deleted on chromosome 10 (PTEN) tumor suppressor gene encodes a tightly regulated dual-specificity phosphatase that serves as the master regulator of PI3K/AKT/mTOR signaling. The carboxy-terminal tail (CTT) is key to regulation and harbors multiple phosphorylation sites (Ser/Thr residues 380–385). CTT phosphorylation suppresses the phosphatase activity by inducing a stable, closed conformation. However, little is known about the mechanisms of phosphorylation-induced CTT-deactivation dynamics. Using explicit solvent microsecond molecular dynamics simulations, we show that CTT phosphorylation leads to a partially collapsed conformation, which alters the secondary structure of PTEN and induces long-range conformational rearrangements that encompass the active site. The active site rearrangements prevent localization of PTEN to the membrane, precluding lipid phosphatase activity. Notably, we have identified phosphorylation-induced allosteric coupling between the interdomain region and a hydrophobic site neighboring the active site in the phosphatase domain. Collectively, the results provide a mechanistic understanding of CTT phosphorylation dynamics and reveal potential druggable allosteric sites in a previously believed clinically undruggable protein.
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