TY - JOUR
T1 - A 3D model for the measles virus receptor CD46 based on homology modeling, Monte Carlo simulations, and hemagglutinin binding studies
AU - Mumenthaler, Christian
AU - Schneider, Urs
AU - Buchholz, Christian J.
AU - Koller, Daniel
AU - Braun, Werner
AU - Cattaneo, Roberto
PY - 1997/3
Y1 - 1997/3
N2 - The two terminal complement control protein (CCP) modules of the CD46 glycoprotein mediate measles virus binding. Three-dimensional models for these two domains were derived based on the NMR structures of two CCP modules of factor H. Both CD46 CCP modules are about 35 Å long, and form a five- stranded antiparallel/β-barrel structure. Monte Carlo simulations, sampling the backbone torsion angles of the linker peptide and selecting possible orientations on the basis of minimal solvent-exposed hydrophobic area, were used to predict the orientation of CCP-I relative to CCP-II. We tested this procedure successfully for factor H. For CD46, three clusters of structures differing in the tilt angle of the two domains were obtained. To test these models, we mutagenized the CCP modules. Four proteins, two without an oligosaccharide chain and two with mutated short amino acid segments, reached the cell surface efficiently. Only the protein without the CCP-I oligosaccharide chain maintained binding to the viral attachment protein hemagglutinin. These results are consistent with one of our models and suggest that the vital hemagglutinin does not bind at the membrane-distal tip of CD46, but near the concave CCP-I-II interface region.
AB - The two terminal complement control protein (CCP) modules of the CD46 glycoprotein mediate measles virus binding. Three-dimensional models for these two domains were derived based on the NMR structures of two CCP modules of factor H. Both CD46 CCP modules are about 35 Å long, and form a five- stranded antiparallel/β-barrel structure. Monte Carlo simulations, sampling the backbone torsion angles of the linker peptide and selecting possible orientations on the basis of minimal solvent-exposed hydrophobic area, were used to predict the orientation of CCP-I relative to CCP-II. We tested this procedure successfully for factor H. For CD46, three clusters of structures differing in the tilt angle of the two domains were obtained. To test these models, we mutagenized the CCP modules. Four proteins, two without an oligosaccharide chain and two with mutated short amino acid segments, reached the cell surface efficiently. Only the protein without the CCP-I oligosaccharide chain maintained binding to the viral attachment protein hemagglutinin. These results are consistent with one of our models and suggest that the vital hemagglutinin does not bind at the membrane-distal tip of CD46, but near the concave CCP-I-II interface region.
KW - FANTOM
KW - Monte Carlo simulations
KW - complement control protein module
KW - distance geometry
KW - hemagglutinin binding
KW - hydrophobic solvent-accessible surface area
KW - measles virus receptor CD46
KW - module assembly
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U2 - 10.1002/pro.5560060308
DO - 10.1002/pro.5560060308
M3 - Article
C2 - 9070441
AN - SCOPUS:0030935563
SN - 0961-8368
VL - 6
SP - 588
EP - 597
JO - Protein Science
JF - Protein Science
IS - 3
ER -