Life in Computational Biology

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  • Read COLVAR file using pandas and formatting

    Sometimes it is convenient to read the COLVAR file (Plumed output) using pandas as it can act as a first step for machine learning based data analysis e.g. time-series forecasting, clustering, dimensionality reduction etc. You need to remove the #! FIELDS part from the header. The modified header looks like time meanfree_sin_chi1_75 meanfree_sin_chi1_76 meanfree_sin_chi1_77 meanfree_sin_chi1_78…

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  • tICA Metadynamics

    Time-lagged independent component analysis is a dimensionality reduction technique which transforms a high dimensional dataset to lower dimensional co-ordinates. It’s philosophy is kind of similar to PCA (principal component analysis).  For more details check here. It is a very recently developed technique which has a lot of promise. tICA can separate slow degrees of freedom…

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  • Parameter for zinc centre proteins

    Parametrization of metallo-proteins always been a challenging problem during the set-up of classical molecular dynamics simulation. This tutorial will describe a short-cut way to set up and Zinc (Zn2+) co-ordinated metallo-protein where Zinc stays in co-ordination with two histidines (HID) and one glutamate as described in the following figure (Figure 1). Note: All the waters…

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