Beyond Structural Bioinformatics for Genomics with Dynamics Characterization of an Expanded KRAS Mutational Landscape

Area of Science:

• Genomics and Structural Bioinformatics
• Molecular Biology and Biochemistry
• Computational Biology and Drug Discovery

Background:

• Genomic sequencing advances outpace functional interpretation of genetic variations.
• The KRAS GTPase is crucial in cancer and rare diseases, but most studies focus on a few hotspot mutations.
• A broader understanding of KRAS mutations is needed for mechanistic insights into disease.

Approach:

• Utilized structural bioinformatics and molecular simulations to analyze 86 KRAS mutations, expanding beyond common hotspot alterations.
• Integrated experimental measurements of mutation thermostability with simulation data.
• Identified coordinated structural changes associated with KRAS biophysical and biochemical properties.

Key Points:

• Analyzed 86 KRAS mutations, including hotspot and non-hotspot alterations, revealing mutation-specific conformations.
• Observed dysregulation of KRAS Switch regions leading to altered effector binding propensities.
• Simulation findings on thermostability were experimentally validated, showing shared and distinct patterns.

Conclusions:

• Molecular simulations provide functional insights into KRAS genetic variations not predictable by current genomic tools.
• Mutation-specific KRAS conformations have implications for diverse molecular and cellular functions.
• This work enhances the interpretation of genetic variation in cancer and germline conditions.