title: Crystallization and preliminary X-ray diffraction analysis of protein L-isoaspartyl O-methyltransferase from wheat germ.
abstract: Wheat-germ protein L-isoaspartyl O-methyltransferase (WPIMT) can initiate the conversion of L-isoaspartyl residues in a protein or peptide, which accumulate during the aging process in wheat-germ seeds, to normal L-aspartyl groups. The recombinant protein of WPIMT was overexpressed in Escherichia coli and purified to homogeneity. The protein was crystallized in the presence of S-adenosine-L-homocysteine using 2-methyl-2,4-pentanediol. Preliminary X-ray analysis indicated a tetragonal space group P4(1)2(1)2 or P4(3)2(1)2, with unit-cell parameters a = b = 77.3, c = 152.9 A for cryofrozen crystals at 90 K. The crystals diffracted to 3.3 A and contain two molecules per asymmetric unit.
authors.affiliation: Laboratory for Structural Biology, Department of Chemistry, University of Alabama in Huntsville, Materials Science Building Room 203-C, Huntsville, AL 35899, USA.
authors.forename: M D
authors.initials: MD
authors.lastname: Amaral
authors.forename: L
authors.initials: L
authors.lastname: Chen
authors.forename: D
authors.initials: D
authors.lastname: Chattopadhyay
authors.forename: C D
authors.initials: CD
authors.lastname: Smith
authors.forename: E J
authors.initials: EJ
authors.lastname: Meehan
mesh_terms: D003001:Cloning, Molecular; D003460:Crystallization; D018360:Crystallography, X-Ray; D004926:Escherichia coli; D026601:Protein D-Aspartate-L-Isoaspartate Methyltransferase; D011496:Protein Methyltransferases / Q000737:chemistry* / Q000302:isolation & purification; D011994:Recombinant Proteins / Q000737:chemistry / Q000302:isolation & purification; D012639:Seeds / Q000201:enzymology; D014908:Triticum / Q000201:enzymology*
chemical_list: D011994:Recombinant Proteins; D011496:Protein Methyltransferases; D026601:Protein D-Aspartate-L-Isoaspartate Methyltransferase