Structural basis for the autoinhibition and STI-571 inhibition of c-Kit tyrosine kinase.
J Biol Chem
; 279(30): 31655-63, 2004 Jul 23.
Article
em En
| MEDLINE
| ID: mdl-15123710
ABSTRACT
The activity of the c-Kit receptor protein-tyrosine kinase is tightly regulated in normal cells, whereas deregulated c-Kit kinase activity is implicated in the pathogenesis of human cancers. The c-Kit juxtamembrane region is known to have an autoinhibitory function; however the precise mechanism by which c-Kit is maintained in an autoinhibited state is not known. We report the 1.9-A resolution crystal structure of native c-Kit kinase in an autoinhibited conformation and compare it with active c-Kit kinase. Autoinhibited c-Kit is stabilized by the juxtamembrane domain, which inserts into the kinase-active site and disrupts formation of the activated structure. A 1.6-A crystal structure of c-Kit in complex with STI-571 (Imatinib or Gleevec) demonstrates that inhibitor binding disrupts this natural mechanism for maintaining c-Kit in an autoinhibited state. Together, these results provide a structural basis for understanding c-Kit kinase autoinhibition and will facilitate the structure-guided design of specific inhibitors that target the activated and autoinhibited conformations of c-Kit kinase.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Piperazinas
/
Pirimidinas
/
Receptores Proteína Tirosina Quinases
/
Proteínas Proto-Oncogênicas c-kit
/
Inibidores Enzimáticos
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Ano de publicação:
2004
Tipo de documento:
Article