title: Prediction of probable mutations in influenza virus hemagglutinin protein based on large-scale ab initio fragment molecular orbital calculations.
abstract: Ab initio electronic-state calculations for influenza virus hemagglutinin (HA) trimer complexed with Fab antibody were performed on the basis of the fragment molecular orbital (FMO) method at the second and third-order Møller-Plesset (MP2 and MP3) perturbation levels. For the protein complex containing 2351 residues and 36,160 atoms, the inter-fragment interaction energies (IFIEs) were evaluated to illustrate the effective interactions between all the pairs of amino acid residues. By analyzing the calculated data on the IFIEs, we first discussed the interactions and their fluctuations between multiple domains contained in the trimer complex. Next, by combining the IFIE data between the Fab antibody and each residue in the HA antigen with experimental data on the hemadsorption activity of HA mutants, we proposed a protocol to predict probable mutations in HA. The proposed protocol based on the FMO-MP2.5 calculation can explain the historical facts concerning the actual mutations after the emergence of A/Hong Kong/1/68 influenza virus with subtype H3N2, and thus provides a useful methodology to enumerate those residue sites likely to mutate in the future.
authors.affiliation: Graduate School of System Infrormatics, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan.
authors.forename: Akio
authors.initials: A
authors.lastname: Yoshioka
authors.forename: Kaori
authors.initials: K
authors.lastname: Fukuzawa
authors.forename: Yuji
authors.initials: Y
authors.lastname: Mochizuki
authors.forename: Katsumi
authors.initials: K
authors.lastname: Yamashita
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Nakano
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Okiyama
authors.forename: Eri
authors.initials: E
authors.lastname: Nobusawa
authors.forename: Katsuhisa
authors.initials: K
authors.lastname: Nakajima
authors.forename: Shigenori
authors.initials: S
authors.lastname: Tanaka
mesh_terms: D000465:Algorithms; D020816:Amino Acid Motifs; D003198:Computer Simulation; D019143:Evolution, Molecular; D006388:Hemagglutinins / Q000737:chemistry*; D006860:Hydrogen Bonding; D007140:Immunoglobulin Fab Fragments / Q000737:chemistry*; D009980:Influenza A virus / Q000235:genetics*; D007252:Influenza Vaccines / Q000737:chemistry; D008958:Models, Molecular; D009154:Mutation; D011485:Protein Binding; D054730:Protein Interaction Domains and Motifs; D013816:Thermodynamics; D014764:Viral Proteins / Q000737:chemistry* / Q000235:genetics
chemical_list: D006388:Hemagglutinins; D007140:Immunoglobulin Fab Fragments; D007252:Influenza Vaccines; D014764:Viral Proteins