title: Crystallization and preliminary X-ray diffraction studies of aclacinomycin-10-methyl esterase and aclacinomycin-10-hydroxylase from Streptomyces purpurascens.
abstract: Two enzymes participating in the biosynthesis of anthracyclines in Streptomyces purpurascens, aclacinomycin-10-methyl esterase (RdmC) and aclacinomycin-10-hydroxylase (RdmB), have been crystallized. RdmB is a S-adenosyl-methionine-dependent hydroxylase and RdmC hydrolyses the carboxymethyl group of the aglycone skeleton of aclacinomycin. Crystals of RdmB obtained in the presence of S-adenosyl-L-methionine were orthorhombic, space group C222(1), with unit-cell parameters a = 63.2, b = 92.2, c = 115.3 A; diffraction data were collected to 2.1 A resolution. RdmC was crystallized as a complex with the substrate, aclacinomycin T. These crystals diffracted to 1.45 A resolution and belonged to space group P2(1), with unit-cell parameters a = 38.2, b = 84.7, c = 44.3 A, beta = 99.9 degrees.
authors.affiliation: Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-17 77 Stockholm, Sweden.
authors.forename: Anna
authors.initials: A
authors.lastname: Jansson
authors.forename: Jarmo
authors.initials: J
authors.lastname: Niemi
authors.forename: Pekka
authors.initials: P
authors.lastname: Mäntsälä
authors.forename: Gunter
authors.initials: G
authors.lastname: Schneider
mesh_terms: D018943:Anthracyclines / Q000378:metabolism; D002265:Carboxylic Ester Hydrolases / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D006899:Mixed Function Oxygenases / Q000737:chemistry*; D013302:Streptomyces / Q000201:enzymology*; D014961:X-Ray Diffraction
chemical_list: D018943:Anthracyclines; C004977:rhodomycin; D006899:Mixed Function Oxygenases; C414540:aclacinomycin-10-hydroxylase; D002265:Carboxylic Ester Hydrolases; C414541:aclacinomycin methyl esterase