title: Purification, crystallization and preliminary X-ray analysis of truncated and mutant forms of VP4 protease from infectious pancreatic necrosis virus.
abstract: In viruses belonging to the Birnaviridae family, virus protein 4 (VP4) is the viral protease responsible for the proteolytic maturation of the polyprotein encoding the major capsid proteins (VP2 and VP3). Infectious pancreatic necrosis virus (IPNV), the prototype of the aquabirnavirus genus, is the causative agent of a contagious disease in fish which has a large economic impact on aquaculture. IPNV VP4 is a 226-residue (24.0 kDa) serine protease that utilizes a Ser/Lys catalytic dyad mechanism (Ser633 and Lys674). Several truncated and mutant forms of VP4 were expressed in a recombinant expression system, purified and screened for crystallization. Two different crystal forms diffract beyond 2.4 A resolution. A triclinic crystal derived from one mutant construct has unit-cell parameters a = 41.7, b = 69.6, c = 191.6 A, alpha = 93.0, beta = 95.1, gamma = 97.7 degrees. A hexagonal crystal with space group P6(1)22/P6(5)22 derived from another mutant construct has unit-cell parameters a = 77.4, b = 77.4, c = 136.9 A.
authors.affiliation: Department of Molecular Biology and Biochemistry, Simon Fraser University, South Science Building, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada.
authors.forename: Jaeyong
authors.initials: J
authors.lastname: Lee
authors.forename: Anat R
authors.initials: AR
authors.lastname: Feldman
authors.forename: Elaine
authors.initials: E
authors.lastname: Chiu
authors.forename: Charlena
authors.initials: C
authors.lastname: Chan
authors.forename: You-Na
authors.initials: YN
authors.lastname: Kim
authors.forename: Bernard
authors.initials: B
authors.lastname: Delmas
authors.forename: Mark
authors.initials: M
authors.lastname: Paetzel
mesh_terms: D003001:Cloning, Molecular; D003460:Crystallization; D018360:Crystallography, X-Ray; D004926:Escherichia coli / Q000378:metabolism; D018061:Infectious pancreatic necrosis virus / Q000737:chemistry*; D016297:Mutagenesis, Site-Directed; D012697:Serine Endopeptidases / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification
chemical_list: D012697:Serine Endopeptidases; C414992:VP4 protease, birnavirus