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A unique inhibitor binding site in ERK1/2 is associated with slow binding kinetics.


ABSTRACT: Activation of the ERK pathway is a hallmark of cancer, and targeting of upstream signaling partners led to the development of approved drugs. Recently, SCH772984 has been shown to be a selective and potent ERK1/2 inhibitor. Here we report the structural mechanism for its remarkable selectivity. In ERK1/2, SCH772984 induces a so-far-unknown binding pocket that accommodates the piperazine-phenyl-pyrimidine decoration. This new binding pocket was created by an inactive conformation of the phosphate-binding loop and an outward tilt of helix ?C. In contrast, structure determination of SCH772984 with the off-target haspin and JNK1 revealed two canonical but distinct type I binding modes. Notably, the new binding mode with ERK1/2 was associated with slow binding kinetics in vitro as well as in cell-based assay systems. The described binding mode of SCH772984 with ERK1/2 enables the design of a new type of specific kinase inhibitors with prolonged on-target activity.

SUBMITTER: Chaikuad A 

PROVIDER: S-EPMC4687050 | biostudies-literature | 2014 Oct

REPOSITORIES: biostudies-literature

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A unique inhibitor binding site in ERK1/2 is associated with slow binding kinetics.

Chaikuad Apirat A   Tacconi Eliana M C EM   Zimmer Jutta J   Liang Yanke Y   Gray Nathanael S NS   Tarsounas Madalena M   Knapp Stefan S  

Nature chemical biology 20140907 10


Activation of the ERK pathway is a hallmark of cancer, and targeting of upstream signaling partners led to the development of approved drugs. Recently, SCH772984 has been shown to be a selective and potent ERK1/2 inhibitor. Here we report the structural mechanism for its remarkable selectivity. In ERK1/2, SCH772984 induces a so-far-unknown binding pocket that accommodates the piperazine-phenyl-pyrimidine decoration. This new binding pocket was created by an inactive conformation of the phosphate  ...[more]

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