Mechanism for KRIT1 release of ICAP1-mediated suppression of integrin activation.
Mol Cell
; 49(4): 719-29, 2013 Feb 21.
Article
en En
| MEDLINE
| ID: mdl-23317506
ABSTRACT
KRIT1 (Krev/Rap1 Interaction Trapped-1) mutations are observed in â¼40% of autosomal-dominant cerebral cavernous malformations (CCMs), a disease occurring in up to 0.5% of the population. We show that KRIT1 functions as a switch for ß1 integrin activation by antagonizing ICAP1 (Integrin Cytoplasmic Associated Protein-1)-mediated modulation of "inside-out" activation. We present cocrystal structures of KRIT1 with ICAP1 and ICAP1 with integrin ß1 cytoplasmic tail to 2.54 and 3.0 Å resolution (the resolutions at which I/σI = 2 are 2.75 and 3.0 Å, respectively). We find that KRIT1 binds ICAP1 by a bidentate surface, that KRIT1 directly competes with integrin ß1 to bind ICAP1, and that KRIT1 antagonizes ICAP1-modulated integrin activation using this site. We also find that KRIT1 contains an N-terminal Nudix domain, in a region previously designated as unstructured. We therefore provide insights to integrin regulation and CCM-associated KRIT1 function.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Proteínas Proto-Oncogénicas
/
Integrina beta1
/
Péptidos y Proteínas de Señalización Intracelular
/
Proteínas de la Membrana
/
Proteínas Asociadas a Microtúbulos
Límite:
Humans
Idioma:
En
Revista:
Mol Cell
Asunto de la revista:
BIOLOGIA MOLECULAR
Año:
2013
Tipo del documento:
Article
País de afiliación:
Estados Unidos