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Updated: Feb 7, 2026
Following the Dynamics of Structural Variants in Experimentally Evolved Populations
Published on: February 3, 2023
Exploring the Lapse in Druggability: Sequence Analysis, Structural Dynamics and Binding Site Characterization of
Emmanuel A Adeniji1, Fisayo A Olotu1, Mahmoud E S Soliman1
1Molecular Bio-Computation and Drug Design Laboratory, School of Health Sciences, University of KwaZulu-Natal, Westville Campus, Durban 4001, South Africa.
Background:
The difficulty in druggability of K-Ras variant has presented a challenge in the treatment of cancer diseases associated with its dysfunctionality. Despite the identification of different binding sites, limited information exists in the literature about their characteristics. Therefore, identification, crossvalidation and characterization of its druggable sites would aid the design of chemical compounds that will arrest its dysfunctionality related oncogenesis.
Objective:
This study entails the identification, cross-validation and characterization of K-Ras G12C variant's binding sites for potential druggability, coupled with the elucidation of alterations in 3D conformations and dynamics.
Method:
Molecular dynamics simulation was carried out on the inactive, the active and the hyperactive K-RasG12Cvariant using the amber software package. The SiteMap software was employed in identifying and characterizing the druggable binding sites while the validation of the binding sites was carried out with the SiteHound and MetaPocket servers.
Results:
Four druggable binding sites were identified, validated and characterized based on physicochemical attributes such as size, volume, degree of enclosure or exposure, degree of contact, hydrophobic/hydrophilic character, hydrophobic/hydrophilic balance and hydrogen-bonding features. Conformational studies also revealed that the K-Ras variant exhibited notable structural instability, increased flexibility and a strongly anticorrelated movement compared to the inactive and active wildtype forms.
Conclusion:
The attributes of the characterized druggable sites will be useful in designing site-specific K-Ras inhibitors for the treatment of K-Ras variant associated cancer diseases.
Insights
This study identified and characterized four druggable binding sites on the K-Ras G12C variant, revealing its structural instability. These findings are crucial for developing targeted K-Ras inhibitors to treat associated cancers.
Area of Science:
- Oncogenic signaling pathways
- Molecular dynamics simulations
- Structural biology
Background:
- Targeting K-Ras variants in cancer treatment remains challenging due to druggability issues.
- Limited characterization of K-Ras binding sites hinders the development of effective therapies.
- Understanding K-Ras variant binding sites is essential for designing novel anti-cancer compounds.
Purpose of the Study:
- To identify, cross-validate, and characterize druggable binding sites on the K-Ras G12C variant.
- To elucidate conformational and dynamic alterations in the K-Ras G12C variant.
- To provide insights for designing K-Ras inhibitors for cancer therapy.
Main Methods:
- Molecular dynamics simulations of K-Ras G12C (inactive, active, hyperactive) using Amber.
- Binding site identification and characterization with SiteMap software.
- Validation of binding sites using SiteHound and MetaPocket servers.
Main Results:
- Four druggable binding sites were identified and validated based on physicochemical properties.
- Characterized sites include details on size, enclosure, contact, and hydrophobicity.
- K-Ras G12C variant showed increased flexibility and instability compared to wildtype forms.
Conclusions:
- The characterized druggable sites offer a basis for designing site-specific K-Ras inhibitors.
- Targeting these sites could lead to novel therapeutic strategies for K-Ras-driven cancers.
- This research advances the development of precision oncology treatments for K-Ras associated malignancies.
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