title: Accuracy of a structural homology model for a class II histocompatibility protein, HLA-DR1: comparison to the crystal structure.
abstract: Structural homology modeling is used to test the accuracy by which a Class I major histocompatibility complex (MHC) could be used to model a Class II MHC. The crystal structure of HLA-aw68 served as a reference molecule to model HLA-DR1. The resulting model was compared to the recently released crystal structure by Brown et al. (Nature, Vol. 364, p. 33-39 (1993)). The overall tertiary structure motif (two alpha-helices and a beta-sheet forming a peptide binding cleft) was maintained. However, significant deviations in the secondary structure elements were found between the model and the DR1 crystal structure. These deviations were consistent with the differences between Class I and Class II crystal structures. In regions where the model and DR1 crystals structures are most similar, side chain orientations are also similar. Specific peptide-MHC interactions are discussed and compared with the crystal structure results.
authors.affiliation: Department of Gastroenterology, Walter Reed Army Institute of Research, Washington, D.C. 20307-5100, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Nauss
authors.forename: R H
authors.initials: RH
authors.lastname: Reid
authors.forename: S
authors.initials: S
authors.lastname: Sadegh-Nasseri
mesh_terms: D000595:Amino Acid Sequence; D001425:Bacterial Outer Membrane Proteins / Q000737:chemistry; D001667:Binding, Competitive; D018360:Crystallography, X-Ray; D036781:Fimbriae Proteins; D015234:HLA-A Antigens / Q000737:chemistry; D015798:HLA-DR1 Antigen / Q000737:chemistry* / Q000378:metabolism; D019267:Hemagglutinin Glycoproteins, Influenza Virus; D006389:Hemagglutinins, Viral / Q000737:chemistry; D006801:Humans; D008958:Models, Molecular; D008969:Molecular Sequence Data; D010455:Peptides / Q000378:metabolism; D011487:Protein Conformation; D017434:Protein Structure, Tertiary
chemical_list: D001425:Bacterial Outer Membrane Proteins; D015234:HLA-A Antigens; C053029:HLA-A*68 antigen; D015798:HLA-DR1 Antigen; D019267:Hemagglutinin Glycoproteins, Influenza Virus; D006389:Hemagglutinins, Viral; D010455:Peptides; D036781:Fimbriae Proteins