Calculating correlated mutations at the protein interface: free energies of pairwise mutants
|Calculating correlated mutations at the protein interface: free energies of pairwise mutants|
|Student name:||student name::Helen Kruize|
|Second supervisor:||Qingzhen Hou|
|Second reader:||has second reader::Qingzhen Hou|
Correlated mutations have been used for many years to identify functionally crucial residue-pairs, commonly interpreted as well as residue contacts. Recent developments in methods, but mainly the increased size of sequence databases, have made predictions of residue contacts accurate enough to be useful for protein structure and interface predictions.
In (other) recent work, we have showen that using molecular dynamics simulations and a coarse-grained forcefield, we can calculate the free energy barrier for unbinding with accuracy at least similar to that of (much more expensive) atomistic simulations.
This project will explore the feasibility of calculating residue correlations based on these free energy calculations. From sequence alignmnents and the structure of the complex (for two proteins), we will identify interface contacts and corresponding pairs of mutations that do occurr in the sequence data, and other pairs of mutations that do not occur in the sequences. We will then establish if we, as we expect, indeed find a much lower impact on the free energy of the tolerated (occurring) pairwise mutations, and a much larger effect than the forbidden (not occurring) mutations.