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Updated: Aug 23, 2025
Exploring Caspase Mutations and Post-Translational Modification by Molecular Modeling Approaches
Published on: October 13, 2022
Exploring Caspase Mutations and Post-Translational Modification by Molecular Modeling Approaches
Dmitry K Nilov1, Alexey V Zamaraev2, Boris Zhivotovsky3
1Belozersky Institute of Physicochemical Biology, Lomonosov Moscow State University; nilovdm@gmail.com.
Abstract:
Apoptosis is a type of programmed cell death that eliminates damaged cells and controls the development and tissue homeostasis of multicellular organisms. Caspases, a family of cysteine proteases, play a key role in apoptosis initiation and execution. The maturation of caspases and their activity is fine-tuned by post-translational modifications in a highly dynamic fashion. To assess the effect of post-translational changes, potential sites are routinely mutated with residues persistent to any modifications. For example, the serine residue is replaced with alanine or aspartic acid. However, such substitutions could alter the caspase active site's conformation, leading to disturbances in catalytic activity and cellular functions. Moreover, mutations of other amino acid residues located in critical positions could also break the structure and functions of caspases and lead to apoptosis perturbation. To avoid the difficulties of employing mutated residues, molecular modeling approaches can be readily applied to estimate the potential effect of amino acid substitutions on caspase structure. The present protocol allows the modeling of both the wild-type caspase and its mutant forms with the biomolecular simulation package (Amber) and supercomputer facilities to test the effect of mutations on the protein structure and function.
Insights
Molecular modeling offers a way to study caspase mutations and their effects on apoptosis without altering protein structure. This approach helps understand how post-translational modifications impact caspase function and cellular health.
Area of Science:
- Biochemistry
- Cell Biology
- Structural Biology
Background:
- Apoptosis, or programmed cell death, is crucial for multicellular organism development and tissue homeostasis.
- Caspases, cysteine proteases, are central to initiating and executing apoptosis.
- Post-translational modifications dynamically regulate caspase maturation and activity.
Purpose of the Study:
- To address limitations of traditional mutation studies in assessing post-translational modifications on caspases.
- To present a molecular modeling protocol for evaluating amino acid substitution effects on caspase structure and function.
Main Methods:
- Utilizing the biomolecular simulation package (Amber) for molecular modeling.
- Employing supercomputer facilities for computational analysis.
- Modeling both wild-type and mutant caspase forms.
Main Results:
- The study provides a protocol to model caspase wild-type and mutant forms.
- This method allows for the assessment of mutation impacts on protein structure and function.
- It offers an alternative to potentially disruptive residue substitutions.
Conclusions:
- Molecular modeling provides a viable strategy to investigate the effects of amino acid substitutions on caspases.
- This approach avoids the conformational and functional disturbances caused by traditional mutation techniques.
- The protocol facilitates a deeper understanding of caspase regulation and its role in apoptosis.
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