Notch receptor cleavage depends on but is not directly executed by presenilins
AUTOR(ES)
Taniguchi, Yoshihito
FONTE
The National Academy of Sciences
RESUMO
Notch receptors undergo three distinct proteolytic cleavages during maturation and activation. The third cleavage occurs within the plasma membrane and results in the release and translocation of the intracellular domain into the nucleus to execute Notch signaling. This so-called γ-secretase cleavage is under the control of presenilins, but it is not known whether presenilins themselves carry out the cleavage or whether they act by means of yet-unidentified γ-secretase(s). In this article, we show that Notch intracellular cleavage in intact cells completely depends on presenilins. In contrast, partial purification of the Notch cleavage activity reveals an activity, which is present only in protein extracts from presenilin-containing cells, and which does not comigrate with presenilin. This finding provides evidence for the existence of a specific Notch-processing activity, which is physically distinct from presenilins. We conclude from these experiments that presenilins are critically required for Notch intracellular cleavage but are not themselves directly mediating the cleavage.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=122640Documentos Relacionados
- Gleevec inhibits β-amyloid production but not Notch cleavage
- Presenilins mediate a dual intramembranous γ-secretase cleavage of Notch-1
- DNA cleavage in immunoglobulin somatic hypermutation depends on de novo protein synthesis but not on uracil DNA glycosylase
- Immunoglobulin receptor signaling depends on the carboxyl terminus but not the heavy-chain class.
- Virological suppression in children and adolescents is not influenced by genotyping, but depends on optimal adherence to antiretroviral therapy