title: Crystallization and preliminary X-ray diffraction analysis of a novel pectate lyase from Azospirillum irakense.
abstract: The PelA gene from the N(2)-fixing plant-associated bacterium Azospirillum irakense encodes a pectate lyase. Analysis of the corresponding amino-acid sequence revealed no homology to other bacterial, plant and fungal pectinases of known published structure, resulting in the classification of the enzyme in a new pectate lyase family. The A. irakense PelA has been crystallized using the hanging-drop vapour-diffusion method at 277 K. The crystals are hexagonal, with unit-cell parameters a = b = 85.55, c = 230.13 A, gamma = 120 degrees, and belong to space group P6(5)22 or P6(1)22, having one molecule per asymmetric unit. Diffraction data to a resolution of 1.97 A were collected at synchrotron facilities, as well as a three-wavelength MAD data set from an Hg-derivative crystal to a resolution of 2.6 A.
authors.affiliation: Laboratorium voor Analytische Chemie en Medicinale Fysicochemie, Faculteit Farmaceutische Wetenschappen, K. U. Leuven, E. van Evenstraat 4, B-3000 Leuven, Belgium.
authors.forename: Hector
authors.initials: H
authors.lastname: Novoa de Armas
authors.forename: Anja
authors.initials: A
authors.lastname: Rabijns
authors.forename: Christel
authors.initials: C
authors.lastname: Verboven
authors.forename: Jos
authors.initials: J
authors.lastname: Desair
authors.forename: Ann
authors.initials: A
authors.lastname: Vande Broek
authors.forename: Jozef
authors.initials: J
authors.lastname: Vanderleyden
authors.forename: Camiel
authors.initials: C
authors.lastname: De Ranter
mesh_terms: D016949:Azospirillum / Q000201:enzymology*; D003460:Crystallization; D018360:Crystallography, X-Ray; D011133:Polysaccharide-Lyases / Q000737:chemistry* / Q000378:metabolism; D011487:Protein Conformation; D012542:Scattering, Radiation
chemical_list: D011133:Polysaccharide-Lyases; C023911:pectate lyase