title: Expression, crystallization and preliminary X-ray analysis of isomaltulose synthase (PalI) from Klebsiella sp. LX3.
abstract: Isomaltulose synthase (PalI) catalyzes the hydrolysis of the alpha-1,2 bond between the glucose and fructose moieties of sucrose and the formation of alpha-1,6 and alpha-1,1 bonds between the two components to produce isomaltulose (alpha-D-glucosylpyranosyl-1,6-D-fructofranose) and trehalulose (alpha-D-glucosylpyranosyl-1,1-D-fructofranose), respectively. The PalI protein has been overexpressed, purified and crystallized at 295 K using the hanging-drop vapour-diffusion method. The crystals diffract to 2.2 A resolution using synchrotron radiation and belong to the orthorhombic space group P2(1)2(1)2(1), with unit-cell parameters a = 59.239, b = 94.153, c = 111.294 A.
authors.affiliation: Laboratory of X-ray Crystallography, Institute of Molecular and Cell Biology, 30 Medical Drive, National University of Singapore, Singapore 117609, Singapore.
authors.forename: Nan
authors.initials: N
authors.lastname: Li
authors.forename: Daohai
authors.initials: D
authors.lastname: Zhang
authors.forename: Lian-Hui
authors.initials: LH
authors.lastname: Zhang
authors.forename: Kunchithapadam
authors.initials: K
authors.lastname: Swaminathan
mesh_terms: D000595:Amino Acid Sequence; D003460:Crystallization; D018360:Crystallography, X-Ray; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics; D005822:Genetic Vectors / Q000235:genetics / Q000378:metabolism; D019751:Intramolecular Transferases / Q000096:biosynthesis / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D007709:Klebsiella / Q000201:enzymology* / Q000235:genetics; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics
chemical_list: D011994:Recombinant Proteins; D019751:Intramolecular Transferases; C042002:isomaltulose synthase