Three types of models can be implemented to display molecules on the computer screen or the plotter: skeletal, solid space-filling and wireframe space-filling models. All manipulations can be made with the use of an ordinary mouse, by choosing from a variety of pull-down menus. SPHERE provides for an interactive manipulation of structures containing up to 2700 atoms which can belong up to six different molecules. CREATE includes commands to create or alter ('mutate') the primary and subsequently the tertiary structure of a given peptide or protein by defining phi and psi angles of residues at will, options to add, delete or alter atoms in a structure, utilities to choose easily between the most common rotamers of amino acid residue sidechains and options to analyse in various ways a protein conformation. It consists of four modules: CREATE, SPHERE, RIBBON and CONVERT. The PBM package was developed to create, display and conveniently manipulate protein and small molecule structures on IBM-compatible microcomputers.
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