mdsa-tools 1.1.5

The Weir Labs H-bond Systems Analyses modules!

mdsa-tools

Tools for systems-level analysis of Molecular Dynamics (MD) simulations

Pipeline overview (read the docs here)

We start from an MD trajectory and generate per-frame interaction networks (graphs/adjacency matrices). Adjacencies are flattened (row-wise) into vectors; stacking these per-frame vectors yields a feature matrix suitable for clustering (e.g., k-means) and dimensionality reduction (PCA/UMAP). Results can be visualized with graphs, scatter plots, MDcircos plots (residue H-bonding), or replicate maps of frame-level measurements of interest. These clustered states can then serve as candidate substates for constructing and analyzing Markov state models (MSMs), enabling exploration of long-timescale dynamics and transition pathways.

Install

pip install mdsa-tools

Systems Problem Area:

In the Weir Group at Wesleyan University, we perform molecular dynamics (MD) simulations of a ribosomal subsystem to study tuning of protein translation by the CAR interaction surface- a ribosomal interface identified by the lab that interacts with the +1 codon (poised to enter the ribosome A site). Our "computational genetics" research focuses on modifying adjacent codon identities at the A-site and the +1 positions to model how changes at these sites influence the behavior of the CAR surface and corellate with translation rate variations.

Quickstart example (see docs for more examples):

from mdsa_tools.Data_gen_hbond import TrajectoryProcessor as tp
import numpy as np
import os

###
### Datagen
###

#load in and test trajectory
system_one_topology = '../PDBs/5JUP_N2_CGU_nowat.prmtop'
system_one_trajectory = '../PDBs/CCU_CGU_10frames.mdcrd'


system_two_topology = '../PDBs/5JUP_N2_GCU_nowat.prmtop'
system_two_trajectory = '../PDBs/CCU_GCU_10frames.mdcrd'


test_trajectory_one = tp(trajectory_path=system_one_trajectory,topology_path=system_one_topology)
test_trajectory_two = tp(trajectory_path=system_two_trajectory,topology_path=system_two_topology)


#now that its loaded in try to make object
test_system_one_ = test_trajectory_one.create_system_representations()
test_system_two_ = test_trajectory_two.create_system_representations()


np.save('test_system_one',test_system_one_)
np.save('test_system_two',test_system_two_)

###
### Analysis
###

from mdsa_tools.Analysis import systems_analysis

all_systems=[test_system_one_,test_system_two_]
Systems_Analyzer = systems_analysis(all_systems)

#transform adjacency matrices preform clustering and dimensional reduction
Systems_Analyzer.replicates_to_featurematrix()
optimal_k_silhouette_labels,optimal_k_elbow_labels,centers_sillohuette,centers_elbow = Systems_Analyzer.cluster_system_level(outfile_path='./test_',max_clusters=5)
print('clustering succesfully completed')
X_pca,weights,explained_variance_ratio_=Systems_Analyzer.reduce_systems_representations(method='PCA') #you could do method=PCA/UMAP here
print('reduction successful')


###
### Visualization
###

import matplotlib.cm as cm
from mdsa_tools.Viz import visualize_reduction
#visualize embedding space with original clusters
visualize_reduction(X_pca,color_mappings=optimal_k_silhouette_labels,savepath='./PCA_',cmap=cm.plasma_r)

#If they exist map transitions between the various cluster assignments
from mdsa_tools.Viz import replicatemap_from_labels
fake_labels=np.arange(0,18,1)
replicatemap_from_labels(cmap=cm.plasma_r,frame_list=[9]*2,labels=fake_labels,savepath='./Repmap_')#9 frames each so