Premium
Structural basis for the selective inhibition of JNK1 by the scaffolding protein JIP1 and SP600125
Author(s) -
Heo YongSeok,
Kim SuKyoung,
Seo Chang Il,
Kim Young Kwan,
Sung ByungJe,
Lee Hye Shin,
Lee Jae Il,
Park SamYong,
Kim Jin Hwan,
Hwang Kwang Yeon,
Hyun YoungLan,
Jeon Young Ho,
Ro Seonggu,
Cho Joong Myung,
Lee Tae Gyu,
Yang ChulHak
Publication year - 2004
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1038/sj.emboj.7600212
Subject(s) - biology , scaffold protein , scaffold , basis (linear algebra) , biochemistry , signal transduction , medicine , geometry , mathematics , biomedical engineering
The c‐jun N‐terminal kinase (JNK) signaling pathway is regulated by JNK‐interacting protein‐1 (JIP1), which is a scaffolding protein assembling the components of the JNK cascade. Overexpression of JIP1 deactivates the JNK pathway selectively by cytoplasmic retention of JNK and thereby inhibits gene expression mediated by JNK, which occurs in the nucleus. Here, we report the crystal structure of human JNK1 complexed with pepJIP1, the peptide fragment of JIP1, revealing its selectivity for JNK1 over other MAPKs and the allosteric inhibition mechanism. The van der Waals contacts by the three residues (Pro157, Leu160, and Leu162) of pepJIP1 and the hydrogen bonding between Glu329 of JNK1 and Arg156 of pepJIP1 are critical for the selective binding. Binding of the peptide also induces a hinge motion between the N‐ and C‐terminal domains of JNK1 and distorts the ATP‐binding cleft, reducing the affinity of the kinase for ATP. In addition, we also determined the ternary complex structure of pepJIP1‐bound JNK1 complexed with SP600125, an ATP‐competitive inhibitor of JNK, providing the basis for the JNK specificity of the compound.