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Journal of Virology, March 2000, p. 2903-2906, Vol. 74, No. 6
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Interaction of Yellow Fever Virus French Neurotropic Vaccine Strain with Monkey Brain: Characterization of Monkey Brain Membrane Receptor Escape Variants

Haolin Ni,1,2 Kate D. Ryman,1,2,dagger Heiman Wang,1,2 Mohammad F. Saeed,2,3 Robin Hull,4 David Wood,4 Philip D. Minor,4 Stanley J. Watowich,5 and Alan D. T. Barrett1,2,3,*

Department of Pathology,1 Center for Tropical Diseases,2 Department of Microbiology and Immunology,3 and Sealy Center for Structural Biology,5 University of Texas Medical Branch, Galveston, Texas 77555-0609, and Division of Virology, National Institute of Biological Standards and Control, Potters Bar EN6 3QG, United Kingdom4

Received 14 June 1999/Accepted 17 December 1999

Binding of yellow fever virus wild-type strains Asibi and French viscerotropic virus and vaccine strains 17D and FNV to monkey brain and monkey liver cell membrane receptor preparations (MRPs) was investigated. Only FNV bound to monkey brain MRPs, while French viscerotropic virus, Asibi, and FNV all bound to monkey liver MRPs. Four monkey brain and two mouse brain MRP escape (MRPR) variants of FNV were selected at pH 7.6 and 6.0. Three monkey brain MRPR variants selected at pH 7.6 each had only one amino acid substitution in the envelope (E) protein in domain II (E-237, E-260, or E274) and were significantly attenuated in mice following intracerebral inoculation. Two of the variants were tested in monkeys and retained parental neurotropism following intracerebral inoculation at the dose tested. We speculate that this region of domain II is involved in binding of FNV E protein to monkey brain and is, in part, responsible for the enhanced neurotropism of FNV for monkeys. A monkey brain MRPR variant selected at pH 6.0 and two mouse brain MRPR variants selected at pH 7.6 were less attenuated in mice, and each had an amino acid substitution in the transmembrane region of the E protein (E-457 or E-458).

* Corresponding author. Mailing address: Department of Pathology, University of Texas Medical Branch, Galveston, TX 77555-0609. Phone: (409) 772-6662. Fax: (409) 747-2415. E-mail: abarrett{at}utmb.edu.

dagger Present address: Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27514.

Journal of Virology, March 2000, p. 2903-2906, Vol. 74, No. 6
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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