I have performed molecular dynamics simulation for 50ns in Gromacs. The protein is stabilized after 20ns. I did PCA analysis for last 30,20,10 and 5 ns. Is there any criteria to select the time period for projecting pca result?
I think the best way to check on the convergence of your MD exploration (therefore the relaibility of your PCA analysis) is to calculate the cosine content
Check out this link: http://comments.gmane.org/gmane.science.biology.gromacs.user/55722