title: Interpretation of very low resolution X-ray electron-density maps using core objects.
abstract: A novel approach to obtaining structural information from macromolecular X-ray data extending to resolutions as low as 20 A is presented. Following a simple map-segmentation procedure, the approximate shapes of the domains forming the structure are identified. A pattern-recognition comparative analysis of these shapes and those derived from the structures of domains from the PDB results in candidate structural models that can be used for a fit into the density map. It is shown that the placed candidate models can be employed for subsequent phase extension to higher resolution.
authors: Hamburg Unit, European Molecular Biology Laboratory, c/o DESY, Notkestrasse 85, Hamburg 22603, Germany. philipp.heuser@embl-hamburg.de
authors: Philipp
authors: P
authors: Heuser
authors: Gerrit G
authors: GG
authors: Langer
authors: Victor S
authors: VS
authors: Lamzin
mesh_terms: D001419:Bacteria / Q000737:chemistry; D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism; D018360:Crystallography, X-Ray / Q000379:methods*; D030562:Databases, Protein; D004583:Electrons; D008958:Models, Molecular; D009153:Mutagens / Q000737:chemistry; D055503:Protein Multimerization; D020836:Protein Structure, Quaternary; D017434:Protein Structure, Tertiary
chemical_list: D001426:Bacterial Proteins; D009153:Mutagens