The crystal structure of recombinant human neutrophil-activating peptide-2 (M6L) at 1.9-A resolution.Malkowski, M.G., Wu, J.Y., Lazar, J.B., Johnson, P.H., Edwards, B.F.
(1995) J.Biol.Chem. 270: 7077-7087
- PubMed: 7706245
- PubMed Abstract:
- The Three Dimensional Structure of Bovine Platelet Factor 4 at 3.0 Angstroms Resolution
Charles, R.St.,Walz, D.A.,Edwards, B.F.P.
(1989) J.Biol.Chem. 264: 2092
- Crystal Structure of Interleukin 8: Symbiosis of NMR and Crystallography
Baldwin, E.T.,Weber, I.T.,Charles, R.St.,Xuan, J.C.,Appella, E.,Yamada, M.,Matsushima, K.,Edwards, B.F.P.,Clore, G.M.,Gronenborn, A.M.,Wlodawer, A.
(1991) Proc.Natl.Acad.Sci.USA 88: 502
- Three Dimensional Structure of Interleukin 8 in Solution
Clore, G.M.,Appella, E.,Yamada, M.,Matsushima, K.,Gronenborn, A.M.
(1990) Biochemistry 29: 1689
Neutrophil-activating peptide-2 (NAP-2) is a 70-residue carboxyl-terminal fragment of platelet basic protein, which is found in the alpha-granules of human platelets. NAP-2, which belongs to the CXC family of chemokines that includes interleukin-8 an ...
Neutrophil-activating peptide-2 (NAP-2) is a 70-residue carboxyl-terminal fragment of platelet basic protein, which is found in the alpha-granules of human platelets. NAP-2, which belongs to the CXC family of chemokines that includes interleukin-8 and platelet factor 4, binds to the interleukin-8 type II receptor and induces a rise in cytosolic calcium, chemotaxis of neutrophils, and exocytosis. Crystals of recombinant NAP-2 in which the single methionine at position 6 was replaced by leucine to facilitate expression belong to space group P1 (unit cell parameters a = 40.8, b = 43.8, and c = 44.7 A and alpha = 98.4 degrees, beta = 120.3 degrees, and gamma = 92.8 degrees), with 4 molecules of NAP-2 (Mr = 7600) in the asymmetric unit. The molecular replacement solution calculated with bovine platelet factor 4 as the starting model was refined using rigid body refinement, manual fitting in solvent-leveled electron density maps, simulated annealing, and restrained least squares to an R-factor of 0.188 for 2 sigma data between 7.0- and 1.9-A resolution. The final refined crystal structure includes 265 solvent molecules. The overall tertiary structure, which is similar to that of platelet factor 4 and interleukin-8, includes an extended amino-terminal loop, three strands of antiparallel beta-sheet arranged in a Greek key fold, and one alpha-helix at the carboxyl terminus. The Glu-Leu-Arg sequence that is critical for receptor binding is fully defined by electron density and exhibits multiple conformations.
Department of Biochemistry, Wayne State University, Detroit, Michigan 48201, USA.