title: TRAJELIX: a computational tool for the geometric characterization of protein helices during molecular dynamics simulations.
abstract: We have developed a computer program with the necessary mathematical formalism for the geometric characterization of distorted conformations of alpha-helices proteins, such as those that can potentially be sampled during typical molecular dynamics simulations. This formalism has been incorporated into TRAJELIX, a new module within the SIMULAID framework (http://inka.mssm.edu/~mezei/simulaid/) that is capable of monitoring distortions of alpha-helices in terms of their displacement, global and local tilting, rotation around their axes, compression/extension, winding/unwinding, and bending. Accurate evaluation of these global and local structural properties of the helix can help study possible intramolecular and intermolecular changes in the helix packing of alpha-helical membrane proteins, as shown here in an application to the interacting helical domains of rhodopsin dimers. Quantification of the dynamic structural behavior of alpha-helical membrane proteins is critical for our understanding of signal transduction, and may enable structure-based design of more specific and efficient drugs.
authors.affiliation: Department of Physiology and Biophysics, Mount Sinai School of Medicine, NYU, One Gustave L. Levy Place, Box 1218, New York, NY 10029, USA. mezei@inka.mssm.edu
authors.forename: Mihaly
authors.initials: M
authors.lastname: Mezei
authors.forename: Marta
authors.initials: M
authors.lastname: Filizola
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D008565:Membrane Proteins / Q000737:chemistry; D008958:Models, Molecular; D011487:Protein Conformation; D017433:Protein Structure, Secondary; D012243:Rhodopsin / Q000737:chemistry; D012984:Software
chemical_list: D008565:Membrane Proteins; D012243:Rhodopsin