Exposure of protein kinase motifs that trigger binding of Hsp90 and Cdc37.

Abstract:

:Hsp90 and its co-chaperone Cdc37 are required for the activity of numerous eukaryotic protein kinases. c-Jun N-terminal kinases (JNKs) appear to be Hsp90-independent kinases, as their activity is unaffected by Hsp90 inhibition. It is currently unknown why some protein kinases are Hsp90- and Cdc37-dependent for their function, while others are not. Therefore, we investigated what structural motifs within JNKs confer or defer Hsp90 and Cdc37 interaction. Both Hsp90 and Cdc37 recognized structural features that were exposed or destabilized upon deletion of JNK1alpha1's N-terminal non-catalytic structural motif, while only Hsp90 bound JNK when its C-terminal non-catalytic structural motif was deleted. Mutations in JNK's activation loop that are known to constitutively activate or inactivate its kinase activity had no effect on JNK's lack of interaction with Hsp90 and Cdc37. Our findings suggest a model in which Hsp90 and Cdc37 each recognize distinct features within the catalytic domains of kinases.

authors

Prince T,Matts RL

doi

10.1016/j.bbrc.2005.10.100

subject

Has Abstract

pub_date

2005-12-23 00:00:00

pages

1447-54

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(05)02348-X

journal_volume

338

pub_type

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