title: Crystallization of human neutrophil elastase.
abstract: Human neutrophil elastase was inactivated by methoxysuccinyl-L-Ala-L-Ala-L-Pro-L-Ala-chloromethane. The modified enzyme was crystallized from 40 mM ammonium phosphate, pH 7.0 in the hexagonal space group P6(3) with unit cell parameters a = 74.53 A, b = 74.53 A, c = 70.88 A, alpha = beta = 90 degrees, gamma = 120 degrees. These crystals were resistant to radiation damage and diffracted beyond 1.84-A resolution. The asymmetric unit contained one 25,000-dalton monomer of human neutrophil elastase. Crystals were also grown from the enzyme modified with the analogous iodinated inactivator, p-iodoanilinosuccinyl-L-Ala-L-Ala-L-Pro-L-Ala-chloromethane. These crystals proved to be isomorphous with those of methoxysuccinyl-L-Ala-L-Ala-L-Pro-L-Ala-chloromethane-modified human neutrophil elastase, and served as a single-site, heavy atom derivative for solving the tertiary structure of the enzyme.
authors: Merck Sharp and Dohme Research Laboratories, Rahway, New Jersey 07065.
authors: H R
authors: HR
authors: Williams
authors: T Y
authors: TY
authors: Lin
authors: M A
authors: MA
authors: Navia
authors: J P
authors: JP
authors: Springer
authors: B M
authors: BM
authors: McKeever
authors: K
authors: K
authors: Hoogsteen
authors: C P
authors: CP
authors: Dorn
mesh_terms: D003460:Crystallization; D006801:Humans; D009504:Neutrophils / Q000201:enzymology*; D010196:Pancreatic Elastase; D014961:X-Ray Diffraction
chemical_list: D010196:Pancreatic Elastase