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A Scalable, Cell-Based Method for the Functional Assessment of Ube3a Variants
Published on: October 10, 2022
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Studying Disease-Associated UBE3A Missense Variants Using Enhanced Sampling Molecular Simulations.
Mark Agostino1,2, Fiona McKenzie3,4, Chloe Buck5
1Curtin Health Innovation Research Institute, Curtin University, Kent Street, Bentley, Perth, Western Australia 6102, Australia.
ACS Omega
|August 1, 2022
Summary
A novel UBE3A gene variant (Leu614Pro) is linked to Angelman Syndrome and developmental regression. Molecular simulations reveal this variant impairs UBE3A protein function, impacting neurodevelopment.
Area of Science:
- Genetics and Molecular Biology
- Neuroscience
- Computational Biology
Background:
- Missense variants in the UBE3A gene are associated with neurodevelopmental disorders like Angelman Syndrome and Autism Spectrum Disorder.
- The precise molecular mechanisms by which UBE3A variants affect protein folding and function remain largely unelucidated.
Purpose of the Study:
- To investigate the functional impact of a novel, maternally inherited UBE3A missense variant (p.(Leu614Pro)) identified in a patient with Angelman Syndrome-like features.
- To explore the conformational and functional consequences of the Leu614Pro substitution on UBE3A protein.
Main Methods:
- Utilized adiabatic biased molecular dynamics and metadynamics simulations to compare the conformational dynamics of the UBE3A Leu614Pro variant with the wildtype protein.
- Analyzed the impact of the variant on protein binding and substrate processing.
Main Results:
- The p.(Leu614Pro) substitution in UBE3A results in altered protein conformation compared to wildtype.
- This substitution leads to reduced binding efficiency and less efficient substrate processing by the UBE3A protein.
Conclusions:
- The Leu614Pro variant likely contributes to neurodevelopmental disorders by impairing UBE3A protein function.
- Enhanced sampling molecular simulations are valuable tools for understanding the pathogenicity of UBE3A missense variants in neurodevelopmental conditions.
