title: Crystallization and preliminary X-ray analysis of Sau3AI/E64A mutant protein.
abstract: Sau3AI is a type II restriction endonuclease that recognizes the palindromic sequence 5'-GATC-3' and cleaves 5' to G residue on each strand. The E64A mutant full length protein was cloned and expressed in Escherichia coli. The purified (His) (6)-tagged protein has monomer and dimer fraction and was crystallized by the hanging-drop vapor-diffusion technique. The dimer protein crystals can diffract to 3.0A. resolution and the monomer protein crystals can diffract to better than 2.8A. resolution. One completed dataset has been collected and it shows that the monomer orthorhombic Sau3AI/E64A crystal is in space group C2221 with unit cell parameters (69.44, 197.60, 191.46, 90, 90, 90) and contains two molecules in one asymmetric unit.
authors.affiliation: Shanghai Institutes of Applied Physics, Chinese Academy of Sciences, 201800 Shanghai PR China.
authors.forename: Chunyan
authors.initials: C
authors.lastname: Xu
authors.forename: Jiaping
authors.initials: J
authors.lastname: Song
authors.forename: Yu
authors.initials: Y
authors.lastname: Ding
authors.forename: Feng
authors.initials: F
authors.lastname: Yu
authors.forename: Lihua
authors.initials: L
authors.lastname: Sun
authors.forename: Lin
authors.initials: L
authors.lastname: Tang
authors.forename: Xiaojian
authors.initials: X
authors.lastname: Hu
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Zhang
authors.forename: Jianhua
authors.initials: J
authors.lastname: He
mesh_terms: D019943:Amino Acid Substitution; D003001:Cloning, Molecular; D003460:Crystallization; D018360:Crystallography, X-Ray; D015252:Deoxyribonucleases, Type II Site-Specific / Q000737:chemistry* / Q000235:genetics; D004926:Escherichia coli / Q000378:metabolism; D013211:Staphylococcus aureus / Q000201:enzymology
chemical_list: D015252:Deoxyribonucleases, Type II Site-Specific; C024405:GATC-specific type II deoxyribonucleases