title: The purification, crystallization and preliminary structural characterization of PhzM, a phenazine-modifying methyltransferase from Pseudomonas aeruginosa.
abstract: Pyocyanin, phenazine-1-carboxylic acid and more than 70 related compounds collectively known as phenazines are produced by various species of Pseudomonas, including the fluorescent pseudomonad P. aeruginosa, a Gram-negative opportunistic pathogen in humans and animals. P. aeruginosa synthesizes a characteristic blue water-soluble compound called pyocyanin (1-hydroxy-5-methyl-phenazine). Two enzymes designated PhzM and PhzS are involved in the terminal steps of its synthesis and very little is known about these enzymes. In this study, PhzM, a dimeric S-adenosylmethionine-dependent methyltransferase, was purified and crystallized from PEG 3350/sodium cacodylate/sodium citrate pH 6.5. The crystals belong to space group P1, with unit-cell parameters a = 46.1, b = 61.8, c = 69.6 A, alpha = 96.3, beta = 106.6, gamma = 106.9 degrees . They contain one dimer in the asymmetric unit and diffract to a resolution of 1.8 A. Anomalous data to 2.3 A resolution have been collected from seleno-L-methionine-labelled PhzM.
authors.affiliation: Max-Planck-Institute of Molecular Physiology, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany.
authors.forename: Neelakshi
authors.initials: N
authors.lastname: Gohain
authors.forename: Linda S
authors.initials: LS
authors.lastname: Thomashow
authors.forename: Dmitri V
authors.initials: DV
authors.lastname: Mavrodi
authors.forename: Wulf
authors.initials: W
authors.lastname: Blankenfeldt
mesh_terms: D000900:Anti-Bacterial Agents / Q000096:biosynthesis / Q000737:chemistry; D001426:Bacterial Proteins / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism; D002384:Catalysis; D003460:Crystallization; D008780:Methyltransferases / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism; D011550:Pseudomonas aeruginosa / Q000201:enzymology* / Q000378:metabolism; D011710:Pyocyanine / Q000096:biosynthesis* / Q000737:chemistry
chemical_list: D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D011710:Pyocyanine; D008780:Methyltransferases; C439052:PhzM protein, Pseudomonas aeruginosa