title: Matrix methods for solving protein substructures of chlorine and sulfur from anomalous data.
abstract: The weak signal obtained from the anomalous scattering (at lambda = 1.54 A) of naturally occurring elements such as sulfur, phosphorus and ordered solvent chloride ions is used to determine the atomic positions of these atoms. Two examples are discussed: the sulfur and chlorine substructure of tetragonal hen egg-white lysozyme and an oligonucleotide containing ten P atoms. The substructure of lysozyme was also solved from Cu K(alpha) radiation data collected on a standard rotating-anode generator. The results presented here are an illustration of the power of the matrix methods, which are to be implemented in next distribution of the direct methods package CRUNCH.
authors.affiliation: Leiden Institute of Chemistry, Gorlaeus Laboratories, University of Leiden, PO Box 9502, 2300 RA Leiden, The Netherlands. rag@chema110.leidenuniv.nl
authors.forename: R A
authors.initials: RA
authors.lastname: de Graaff
authors.forename: M
authors.initials: M
authors.lastname: Hilge
authors.forename: J L
authors.initials: JL
authors.lastname: van der Plas
authors.forename: J P
authors.initials: JP
authors.lastname: Abrahams
mesh_terms: D000465:Algorithms; D002713:Chlorine / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008956:Models, Chemical; D008958:Models, Molecular; D009113:Muramidase / Q000737:chemistry*; D009841:Oligonucleotides / Q000737:chemistry; D011487:Protein Conformation; D013455:Sulfur / Q000737:chemistry*
chemical_list: D009841:Oligonucleotides; D002713:Chlorine; D013455:Sulfur; D009113:Muramidase