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Biology subjects

Hadders, M. A.

Publications and source records attributed to Hadders, M. A..

2 recordsLinked to original sources

β-Catenin condensation facilitates clustering of the cadherin/catenin complex and formation of nascent cell-cell junctions

Cadherin-based junctions establish dynamically regulated adhesion between cells to coordinate tissue integrity and morphogenetic movements. Adhesion strength can be modulated by the organization of individual cadherin complexes into lateral clusters. Here, we identify a novel clustering mechanism of the cadherin complex established by its core component {beta}-catenin. We show that the disordered termini of {beta}-catenin drive the formation of condensates that incorporate other components of the cadherin complex in vitro. Using {beta}-catenin mutants with hampered condensation, we demonstrate that {beta}-catenin condensation nucleates the formation of submicron cadherin/catenin clusters that further develop into stable sites of adhesion. Furthermore, we show that {beta}-catenin-dependent clustering ensures the efficient formation of de novo cell-cell adhesions. Our data thus indicate a role for {beta}-catenin condensates in the supramolecular organization of the cadherin complex, and reveal that the function of {beta}-catenin in the cadherin complex extends beyond connecting cadherin to -catenin and the actin cytoskeleton.

cell biology↗

Molecular Basis for CPC-Sgo1 Interaction: Implications for Centromere Localisation and Function of the CPC

The Chromosomal Passenger Complex (CPC; consisting of Borealin, Survivin, INCENP and Aurora B kinase) and Shugoshin 1 (Sgo1) are key regulators of chromosome bi-orientation, a process essential for error-free chromosome segregation. Their functions rely on their ability to associate with centromeres. Two histone phosphorylations, histone H3 Thr3 (H3T3ph; directly recognised by Survivin) and histone H2A Thr120 (H2AT120ph; indirectly recognised via Sgo1), together with CPCs intrinsic ability to bind nucleosome, facilitate CPC centromere recruitment. The molecular basis for CPC-Sgo1 binding and how their direct interaction influences CPC centromere localisation and function are lacking. Here, using an integrative structure-function approach, we show that the histone H3-like Sgo1 N-terminal tail interacts with Survivin acting as a hot-spot for CPC-Sgo1 assembly, while downstream Sgo1 residues, mainly with Borealin contributes for high affinity interaction. Disruption of the Sgo1 N-terminal tail-Survivin interaction abolished CPC-Sgo1 assembly in vitro and perturbed centromere localisation and function of CPC. Our findings provide evidence that CPC binding to Sgo1 and histone H3 N-terminal tail are mutually exclusive, suggesting that these interactions will likely take place in a spatially/temporally restricted manner and provide a rationale for the Sgo1-mediated kinetochore proximal centromere pool of CPC.

cell biology↗