title: Crystallization and preliminary X-ray analysis of outer membrane phospholipase A from Escherichia coli.
abstract: The outer membrane phospholipase A (OMPLA) of Escherichia coli is one of the few integral outer membrane proteins displaying enzymatic activity. It is encoded as a mature protein of 269 amino acids preceded by a signal sequence of 20 amino acids. There is no sequence homology with water-soluble lipases and phospholipases. Crystals of the mature enzyme were obtained at 22 degrees C from 24-28% (v/v) 2-methyl-2,4-pentanediol in Bis-Tris buffer, pH 5.9-6.0, with 1 mM calcium chloride and 1.5% (w/v) beta-octylglucoside. They have the symmetry of the trigonal spacegroup P3(1)21 (or P3(2)21) with cell dimensions of a = b = 79.6 A and c = 102.8 A (alpha = beta = 90 degrees, gamma = 120 degrees). Native crystals diffract to a resolution of 2.6 A.
authors.affiliation: Laboratory of Biophysical Chemistry, University of Groningen, The Netherlands.
authors.forename: M
authors.initials: M
authors.lastname: Blaauw
authors.forename: N
authors.initials: N
authors.lastname: Dekker
authors.forename: H M
authors.initials: HM
authors.lastname: Verheij
authors.forename: K H
authors.initials: KH
authors.lastname: Kalk
authors.forename: B W
authors.initials: BW
authors.lastname: Dijkstra
mesh_terms: D000595:Amino Acid Sequence; D002462:Cell Membrane / Q000201:enzymology; D003001:Cloning, Molecular; D003460:Crystallization; D018360:Crystallography, X-Ray / Q000379:methods; D004926:Escherichia coli / Q000201:enzymology*; D007202:Indicators and Reagents; D008969:Molecular Sequence Data; D010741:Phospholipases A / Q000096:biosynthesis / Q000737:chemistry* / Q000302:isolation & purification; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D007202:Indicators and Reagents; D011994:Recombinant Proteins; D010741:Phospholipases A