Peptide Folding in Cellular Environments: A Monte Carlo and Markov Modeling Approach

Steric interactions with surrounding macromolecules tend to favor the compact native state of a globular protein over its unfolded state. However, in experiments conducted in cells and concentrated protein solutions, both stabilization and destabilization of proteins have been observed, compared to dilute-solution conditions. Therefore, in order to understand the effects of surrounding macromolecules on protein properties such as stability, there is a need for computational modeling beyond the level of hard-sphere crowders. Here, we discuss some recent exploratory studies of peptide folding in the presence of explicit protein crowders, carried out by us using an all-atom Monte Carlo-based approach along with an implicit solvent force field. For interpreting the simulation data, time-lagged independent component analysis and Markov state modeling are used