OPRLM: Orientations of proteins in realistic lipid membranes

A new web tool and a database, OPRLM (Orientations of Proteins in Realistic Lipid Membranes), has been created based on the OPM database and the broadly used GHARMM-GUI toolset. The database provides a complete set of experimental 3D structures of integral and peripheral membrane proteins from the Protein Data Bank that are positioned in planar and curved lipid bilayers using implicit and explicit membrane representations. Membrane systems vary from single-component artificial lipid bilayers to multi-component bilayers with complex lipid composition corresponding to 18 biomembranes with either asymmetric or symmetric distribution of lipid types between two leaflets: 14 “average” eukaryotic cellular and organelle membranes (plasma membranes of mammals, plants, and fungi, endoplasmic reticulum and apparatus Golgi membranes of mammals and fungi, mammalian membranes of endosomes and lysosomes, mitochondrial outer and inner membranes, plant vacuole membranes, thylakoid membranes of plants and cyanobacteria), the outer and the inner membranes of Gram-negative bacteria (E. coli), and “average” cell membranes of Gram-positive bacteria and archaebacteria. All these membrane systems are accessible for public use in CHARMM-GUI Archive (https://www.charmm-gui.org/docs/archive/biomembrane). The web tool allows users of any level of expertise an easy setup of protein-membrane systems for atomic molecular dynamics (MD) simulations in pre-assembled realistic lipid membranes formed by mixtures of explicit lipids. OPRLM is publicly available at https://oprlm.org/.