Dynamic Flexibility Index (DFI)

The Dynamic Flexibility Index (DFI) measures the relative flexibility or rigidity of individual residues within a protein. Developed using Linear Response Theory and Perturbation Response Scanning, DFI calculates how a residue responds to perturbations exerted on other residues. This response is mapped using the covariance matrix derived from molecular dynamics simulations, highlighting flexible and rigid regions of the protein structure. Positions with low DFI scores are highly rigid and typically act as dynamic hubs, while those with high scores are more flexible and less involved in collective motions. The DFI profiles are usually associated with function.

Check our web tool for DFI calculations