title: Expression, crystallization and preliminary crystallographic analysis of the extracellular IgV-like domain of the human natural killer cell inhibitory receptor p75/AIRM1.
abstract: p75/AIRM1 (Siglec-7) is a sialic acid-binding Ig-like lectin recently identified as an inhibitory receptor on natural killer cells. The expression, in vitro folding, circular-dichroism spectroscopy, crystallization and preliminary X-ray characterization of the Ig-V like domain of p75/AIRM1 are reported. X-ray data were collected from a single crystal at 100 K, with a maximum useful diffraction pattern extending to 1.45 A resolution on a synchrotron source. The crystal belongs to a primitive monoclinic space group, with unit-cell parameters a = 32.65, b = 49.72, c = 39.79 A, alpha = gamma = 90, beta = 113 degrees. The systematic absences indicate that the space group is P2(1). Assuming one molecule per asymmetric unit, V(M) (the Matthews coefficient) was calculated to be 1.879 A(3) Da(-1) and the solvent content was estimated to be 32.01%.
mesh_terms: D002942:Circular Dichroism; D003460:Crystallization; D018360:Crystallography, X-Ray / Q000379:methods; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D006801:Humans; D007136:Immunoglobulins / Q000737:chemistry; D007694:Killer Cells, Natural / Q000276:immunology*; D017434:Protein Structure, Tertiary; D011971:Receptors, Immunologic / Q000096:biosynthesis* / Q000737:chemistry* / Q000235:genetics / Q000276:immunology; D054340:Receptors, KIR; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics / Q000276:immunology; D017356:Synchrotrons
chemical_list: D007136:Immunoglobulins; D011971:Receptors, Immunologic; D054340:Receptors, KIR; D011994:Recombinant Proteins; C121772:adhesion inhibitory receptor molecule 1