Crystallization and preliminary crystallographic analysis of Mycoplasma arthritidis-derived mitogen complexed with peptide/MHC class II antigen.
Mycoplasma arthritidis-derived mitogen (MAM), a bacterial superantigen, has been crystallized in complex with its human receptor, major histocompatibility complex (MHC) class II antigen, by the hanging-drop vapor-diffusion method. Crystals were obtained under three conditions, with ammonium sulfate, phosphate salt and PEG 8000 as the precipitant. The crystals grown under these conditions all belong to space group I222, with the same unit-cell parameters: a = 137.4, b = 178.2, c = 179.6 A. Diffraction data were collected to 3.3 and 3.4 A resolution from crystals of native and selenomethionylated MAM-MHC complexes, respectively. Self- and cross-rotation function calculations suggest the presence of two complex molecules in the asymmetric unit, resulting in a V(M) of 4.0 and a solvent content of 69%. An interpretable electron-density map was produced using a combination of molecular replacement and SAD phasing.
Zhao
Yiwei
Y
Wadsworth Center, New York State Department of Health, Empire State Plaza, PO Box 509, Albany, New York 12201-0509, USA.
Li
Zhong
Z
Drozd
Sandra
S
Guo
Yi
Y
Stack
Robert
R
Hauer
Charles
C
Li
Hongmin
H
D000941:Antigens; D000942:Antigens, Bacterial / Q000737:chemistry; D002845:Chromatography; D018360:Crystallography, X-Ray / Q000379:methods; D004058:Diffusion; D004583:Electrons; D004926:Escherichia coli / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D006801:Humans; D007700:Kinetics; D008285:Major Histocompatibility Complex; D013058:Mass Spectrometry; D008934:Mitogens / Q000737:chemistry*; D045645:Mycoplasma arthritidis / Q000378:metabolism*; D010455:Peptides / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011506:Proteins; D011994:Recombinant Proteins / Q000737:chemistry; D012645:Selenomethionine / Q000737:chemistry; D018089:Superantigens; D013997:Time Factors
D000941:Antigens; D000942:Antigens, Bacterial; D008934:Mitogens; C052996:Mycoplasma arthritidis mitogen; D010455:Peptides; D011506:Proteins; D011994:Recombinant Proteins; D018089:Superantigens; D011092:Polyethylene Glycols; D012645:Selenomethionine; D005982:Glutathione Transferase