Hamartin and tuberin interaction with the G2/M cyclin-dependent kinase CDK1 and its regulatory cyclins A and B.

Abstract:

:Tuberous sclerosis (TSC) is a multi-system disorder characterized by hamartomatous tumors and abnormal brain development, with multiple foci of disrupted neuronal migration and giant dysmorphic neurons within cortical tubers. TSC is associated with mutations in 2 genes, TSC1 and TSC2, which encode hamartin and tuberin, respectively. The functions of these proteins have yet to be determined. Recently, the Drosophila homologue of TSC2, gigas, has been shown to be required for the G2/M transition of the cell cycle. However, the mechanism of this action remains unknown. Because the cyclin-dependent kinase CDK1 forms a complex with cyclin B1 to trigger the G2/M transition, we hypothesized that tuberin interacts with CDK1 to regulate its activity. In the study reported in this paper, we have used co-immunoprecipitation and confocal microscopy to demonstrate that tuberin interacts with and co-localizes with CDK1 and its binding partner cyclin B1 in multiple cell types. We also demonstrate that hamartin interacts with CDK1 and cyclin B1. We further present evidence that tuberin interacts with the other regulatory subunit of CDK1, cyclin A. These findings suggest a direct role for tuberin and hamartin in modulating the activity of CDK1 during G2 and the G2/M transition. This is the first description of a role for both tuberin and hamartin in a common cellular function, providing a potential mechanism for the identical clinicopathologic manifestations that result when either of these proteins are inactivated.

authors

Catania MG,Mischel PS,Vinters HV

doi

10.1093/jnen/60.7.711

subject

Has Abstract

pub_date

2001-07-01 00:00:00

pages

711-23

issue

7

eissn

0022-3069

issn

1554-6578

journal_volume

60

pub_type

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