Genotypic Differences in Dengue Virus Neutralization Are Explained by a Single Amino Acid Mutation That Modulates Virus Breathing

被引:63
作者
Dowd, Kimberly A. [1 ]
DeMaso, Christina R. [1 ]
Pierson, Theodore C. [1 ]
机构
[1] NIAID, Viral Pathogenesis Sect, Viral Dis Lab, NIH, Bethesda, MD 20892 USA
来源
MBIO | 2015年 / 6卷 / 06期
关键词
WEST-NILE-VIRUS; ANTIBODY-MEDIATED NEUTRALIZATION; COXSACKIEVIRUS B3; MONOCLONAL-ANTIBODIES; STRUCTURAL INSIGHTS; MOLECULAR EVOLUTION; SYNTHETIC PEPTIDES; ENVELOPE PROTEIN; EPITOPE EXPOSURE; ANTIGENIC SITES;
D O I
10.1128/mBio.01559-15
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Flaviviruses sample an ensemble of virion conformations resulting from the conformational flexibility of their structural proteins. To investigate how sequence variation among strains impacts virus breathing, we performed studies with the monoclonal antibody (MAb) E111, which binds an inaccessible domain III envelope (E) protein epitope of dengue virus serotype 1 (DENV1). Prior studies indicated that an observed similar to 200-fold difference in neutralization between the DENV1 strains Western Pacific-74 (West Pac-74) and 16007 could not be explained by differences in the affinity of MAb E111 for each strain. Through neutralization studies with wild-type and variant viruses carrying genes encoding reciprocal mutations at all 13 amino acid differences between the E proteins of West Pac-74 and 16007, we found that E111 neutralization susceptibility mapped solely to the presence of a lysine or arginine at E domain II residue 204, located distally from the E111 epitope. This same residue correlated with neutralization differences observed for MAbs specific for epitopes distinct from E111, suggesting that this amino acid dictates changes in the conformational ensembles sampled by the virus. Furthermore, an observed twofold difference in the stability of infectious West Pac-74 versus 16007 in solution also mapped to E residue 204. Our results demonstrate that neutralization susceptibility can be altered in an epitope-independent manner by natural strain variation that influences the structures sampled by DENV. That different conformational ensembles of flaviviruses may affect the landscape available for antibody binding, as well as virus stability, has important implications for functional studies of antibody potency, a critical aspect of vaccine development. IMPORTANCE The global burden of dengue virus (DENV) is growing, with recent estimates of similar to 390 million human infections each year. Antibodies play a crucial role in protection from DENV infection, and vaccines that elicit a robust antibody response are being actively pursued. We report here the identification of a single amino acid residue in the envelope protein of DENV serotype 1 that results in global changes to virus structure and stability when it is changed. Our results indicate that naturally occurring variation at this particular site among virus strains impacts the ensemble of structures sampled by the virus, a process referred to as virus breathing. The finding that such limited and conservative sequence changes can modulate the landscape available for antibody binding has important implications for both vaccine development and the study of DENV-reactive antibodies.
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页数:11
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