National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
R56 AI117675
米国
引用
ジャーナル: Nat Commun / 年: 2017 タイトル: In vitro evolution of an influenza broadly neutralizing antibody is modulated by hemagglutinin receptor specificity. 著者: Nicholas C Wu / Geramie Grande / Hannah L Turner / Andrew B Ward / Jia Xie / Richard A Lerner / Ian A Wilson / 要旨: The relatively recent discovery and characterization of human broadly neutralizing antibodies (bnAbs) against influenza virus provide valuable insights into antiviral and vaccine development. ...The relatively recent discovery and characterization of human broadly neutralizing antibodies (bnAbs) against influenza virus provide valuable insights into antiviral and vaccine development. However, the factors that influence the evolution of high-affinity bnAbs remain elusive. We therefore explore the functional sequence space of bnAb C05, which targets the receptor-binding site (RBS) of influenza haemagglutinin (HA) via a long CDR H3. We combine saturation mutagenesis with yeast display to enrich for C05 variants of CDR H3 that bind to H1 and H3 HAs. The C05 variants evolve up to 20-fold higher affinity but increase specificity to each HA subtype used in the selection. Structural analysis reveals that the fine specificity is strongly influenced by a highly conserved substitution that regulates receptor binding in different subtypes. Overall, this study suggests that subtle natural variations in the HA RBS between subtypes and species may differentially influence the evolution of high-affinity bnAbs.
解像度: 1.97→88.34 Å / Cor.coef. Fo:Fc: 0.957 / Cor.coef. Fo:Fc free: 0.944 / SU B: 6.696 / SU ML: 0.095 / 交差検証法: THROUGHOUT / ESU R: 0.14 / ESU R Free: 0.128 / 立体化学のターゲット値: MAXIMUM LIKELIHOOD / 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
Rfactor
反射数
%反射
Selection details
Rfree
0.2083
6721
4.9 %
RANDOM
Rwork
0.18124
-
-
-
obs
0.18254
129540
99.46 %
-
溶媒の処理
イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.2 Å / 溶媒モデル: MASK