In this short tutorial, we’ll walk you through a basic example using enspara to make an MSM and do a simple analysis.
Before you get started, however, let’s download some molecular dynamics data! This MD data is of the Fs peptide (Ace-A_5(AAARA)_3A-NME), which is a fairly common model system for studying protein folding. It was prepared by Robert McGibbon for MSMBuilder3.
mkdir fs_peptide && cd fs_peptide wget https://ndownloader.figshare.com/articles/1030363/versions/1 -O fs_peptide.zip unzip fs_peptide.zip
While you’re waiting for that download, check the textbook on MSMs, “An Introduction to Markov State Models and Their Application to Long Timescale Molecular Simulation” edited by Greg Bowman, Vijay Pande, and Frank Noe. That book describes the theoretical and empirical groundwork for a lot of what we’ll do.
Anyway, once your download is finished, if you
ls, you should see a bunch
of trajectories (
*.xtc), a pdb file
fs-peptide.pdb, and a few other
files. If you do, you’re ready to move on.