LiPyphilic: A Python toolkit for the analysis of lipid membrane simulations

Molecular dynamics simulations are now widely used to study emergent phenomena in lipid membranes with complex compositions. Here, we present LiPyphilic - a fast, fully tested, and easy to install Python package for analysing such simulations. Analysis tools in LiPyphilic include the identification of cholesterol flip-flop events, the classification of local lipid environments, and the degree of interleaflet registration. LiPyphilic is both force field and resolution agnostic, and thanks to the powerful atom selection language of MDAnalysis it can handle membranes with highly complex compositions. LiPyphilic also offers two on-the-fly trajectory transformations to i) fix membranes split across periodic boundaries and ii) perform nojump coordinate unwrapping. Our implementation of nojump unwrapping accounts for fluctuations in box volume under the NPT ensemble -- an issue that most current implementations have overlooked. The full documentation of LiPyphilic, including installation instructions, is available at https://lipyphilic.readthedocs.io/en/latest. Graphical TOC Entry O_FIG O_LINKSMALLFIG WIDTH=200 HEIGHT=111 SRC="FIGDIR/small/442445v1_ufig1.gif" ALT="Figure 1"> View larger version (16K): org.highwire.dtl.DTLVardef@137f053org.highwire.dtl.DTLVardef@18302cdorg.highwire.dtl.DTLVardef@2cf919org.highwire.dtl.DTLVardef@95fa40_HPS_FORMAT_FIGEXP M_FIG C_FIG