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A Comparison of New World Alphaviruses in the Western Equine Encephalomyelitis Complex by Immunochemical and Oligonucleotide Fingerprint Techniques

The Vector-Borne Diseases Division, Bureau of Laboratories, Center for Disease Control, Public Health Service, U.S. Department of Health, Education and Welfare, P.O. Box 2087, Fort Collins, Colorado 80522, U.S.A.

We have examined the molecular basis for the observed antigenic differences between isolates of western equine encephalomyelitis (WEE) virus and those of a serologically related alphavirus from the eastern United States designated Highlands J (HJ). The structural proteins of WEE virus isolates have mol. wt. of 55 x 10³ (E₁), 47 x 10³ (E₂) and 33 x 10³ for the nucleocapsid. The E₁ glycoprotein had an isoelectric point (pI) of 6.4 and induced haemagglutination-inhibiting (HI) antibody which was specific for WEE virus. The E₂ glycoprotein of WEE virus had a pI of 8.4 and induced antibody which was virus specific by neutralization (PRNT) but cross-reacted with HJ virus in the radioimmune precipitation (RIP) test. Envelope glycoproteins of HJ virus isolates had mol. wt. of 58 x 10³ (E₁) and 49 x 10³ (E₂) respectively. The E₁ glycoprotein from HJ virus had a pI of 6.8 and induced antibody which reacted specifically in the HI, PRNT and RIP tests. Isolated E₂ protein of HJ virus had a pI of 9.1 and induced antibodies which were reactive at equal titre with both WEE and HJ viruses by RIP.

Two-dimensional gel electrophoresis of RNase T₁ oligonucleotides of WEE virus and HJ virus genome RNase T₁ oligonucleotides revealed that the primary structures of the RNAs of these two serologically related alphaviruses were very distant. The fingerprints of the oligonucleotides from 16 WEE viruses from western and central North America, Mexico and South America were similar to each other and easily distinguished from those of the eight HJ viruses isolated in the eastern United States from Massachusetts to Louisiana.

Received 13 September 1979; accepted 2 October 1979.

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