title: Crystallization of a large single crystal of cubic insulin for neutron protein crystallography.
abstract: The growth of a large single crystal of cubic porcine insulin for characterization of hydrogen and hydration in cubic insulin crystals by neutron diffraction analysis is reported. Growth in D2O was investigated based on the phase diagram for cubic insulin to determine appropriate growth conditions, and a large single crystal was then successfully grown by a dialysis method to a size of 4.0 x 4.0 x 1.3 mm3. Neutron diffraction analysis of the cubic insulin crystals was carried out using a single-crystal diffractometer at the JRR-3M reactor of the Japan Atomic Energy Research Institute. In preliminary analysis, Npi appears to be protonated and Ntau deprotonated in His5 in the B-chain, whereas both Npi and Ntau are protonated in His10.
authors.affiliation: Neutron Science Research Center, Japan Atomic Energy Research Institute, 2-4 Sirakata Shirane, Tokai-mura, Naka-Gun, Ibaraki-ken, 319-1195, Japan. mmaeda@neutrons.tokai.jaeri.go.jp
authors.forename: M
authors.initials: M
authors.lastname: Maeda
authors.forename: T
authors.initials: T
authors.lastname: Chatake
authors.forename: I
authors.initials: I
authors.lastname: Tanaka
authors.forename: A
authors.initials: A
authors.lastname: Ostermann
authors.forename: N
authors.initials: N
authors.lastname: Niimura
mesh_terms: D003460:Crystallization / Q000379:methods*; D018360:Crystallography, X-Ray / Q000379:methods*; D007328:Insulin / Q000032:analysis* / Q000138:chemical synthesis / Q000737:chemistry*; D046911:Macromolecular Substances; D017551:Microdialysis / Q000379:methods*; D033363:Neutron Diffraction / Q000379:methods*; D044367:Phase Transition; D011487:Protein Conformation; D011786:Quality Control
chemical_list: D007328:Insulin; D046911:Macromolecular Substances