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Published on: August 16, 2017
Structure function analysis of serpin super-family: "a computational approach"
Poonam Singh, Mohamad Aman Jairajpuri1
1Protein Conformation and Enzymology Lab, Department of Biosciences, Jamia Millia Islamia University, Jamia Nagar, New-Delhi 110025, India. mjairajpuri@jmi.ac.in.
Protein and Peptide Letters
|July 17, 2013
Summary
Serine protease inhibitors (serpins) are crucial for many pathways but prone to disease-causing conformational changes. Computational studies reveal residue burial and cavities drive serpin polymerization and protease specificity.
Area of Science:
- Biochemistry
- Structural Biology
- Computational Biology
Background:
- Serine protease inhibitors (serpins) regulate critical biological pathways including inflammation, coagulation, and fibrinolysis.
- Serpins are susceptible to conformational diseases and mutations, leading to pathologies like emphysema, thrombosis, and dementia.
- Pathologies arising from serpin polymerization are widespread, yet their mechanisms remain unclear, hindering therapeutic development.
Purpose of the Study:
- To investigate the structural and mechanistic basis of serpin superfamily function and dysfunction using computational approaches.
- To identify key factors contributing to serpin polymerization propensity and conformational instability.
- To elucidate the structural determinants of protease specificity and cofactor binding in serpins.
Main Methods:
- Utilized diverse computational biology tools for analyzing the serpin superfamily.
- Performed residue burial analysis to assess conformational stability and polymer propensity.
- Conducted cavity analysis and interface analysis of serpin-protease complexes.
- Analyzed isozyme-specific antithrombin structures to understand heparin binding.
Main Results:
- Residue burial significantly influences conformational stability and increases polymer propensity in serpins.
- Amino acids involved in polymerization are typically buried in the native serpin conformation.
- Isozyme-specific antithrombin analysis revealed structural basis for enhanced heparin binding in beta-antithrombin.
- Cavity analysis highlighted the importance of internal cavities in serpin inhibition and polymerization.
- Interface analysis identified conserved residues in exosites critical for protease specificity.
Conclusions:
- In-depth computational studies are essential for understanding the serpin superfamily's structure, mechanism, and associated diseases.
- Key structural features like residue burial, internal cavities, and conserved exosite residues dictate serpin function, polymerization, and specificity.
- This work provides a foundation for further computational investigations into serpin-related pathologies and therapeutic strategies.
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