Experimental Adaptation of Wild-Type Canine Distemper Virus (CDV) to the Human Entry Receptor CD150

被引:66
作者
Bieringer, Maria [1 ]
Han, Jung Woo [1 ]
Kendl, Sabine [1 ]
Khosravi, Mojtaba [2 ]
Plattet, Philippe [2 ]
Schneider-Schaulies, Juergen [1 ]
机构
[1] Univ Wurzburg, Inst Virol & Immunobiol, Wurzburg, Germany
[2] Univ Bern, Dept Clin Vet Med, Vetsuisse Fac, Bern, Switzerland
来源
PLOS ONE | 2013年 / 8卷 / 03期
关键词
MEASLES-VIRUS; CELLULAR RECEPTOR; SLAM CD150; NATURAL INFECTION; RHESUS-MONKEYS; HEMAGGLUTININ; PROTEIN; MORBILLIVIRUSES; NECTIN4; CDW150;
D O I
10.1371/journal.pone.0057488
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Canine distemper virus (CDV), a close relative of measles virus (MV), is widespread and well known for its broad host range. When the goal of measles eradication may be achieved, and when measles vaccination will be stopped, CDV might eventually cross the species barrier to humans and emerge as a new human pathogen. In order to get an impression how fast such alterations may occur, we characterized required adaptive mutations to the human entry receptors CD150 (SLAM) and nectin-4 as first step to infect human target cells. Recombinant wild-type CDV-A75/17(red) adapted quickly to growth in human H358 epithelial cells expressing human nectin-4. Sequencing of the viral attachment proteins (hemagglutinin, H, and fusion protein, F) genes revealed that no adaptive alteration was required to utilize human nectin-4. In contrast, the virus replicated only to low titres (10(2) pfu/ml) in Vero cells expressing human CD150 (Vero-hSLAM). After three passages using these cells virus was adapted to human CD150 and replicated to high titres (10(5) pfu/ml). Sequence analyses revealed that only one amino acid exchange in the H-protein at position 540 Asp -> Gly (D540G) was required for functional adaptation to human CD150. Structural modelling suggests that the adaptive mutation D540G in H reflects the sequence alteration from canine to human CD150 at position 70 and 71 from Pro to Leu (P70L) and Gly to Glu (G71E), and compensates for the gain of a negative charge in the human CD150 molecule. Using this model system our data indicate that only a minimal alteration, in this case one adaptive mutation, is required for adaptation of CDV to the human entry receptors, and help to understand the molecular basis why this adaptive mutation occurs.
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