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J Virol, August 1998, p. 6621-6628, Vol. 72, No. 8
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

The Human Homolog of HAVcr-1 Codes for a Hepatitis A Virus Cellular Receptor

Dino Feigelstock, Peter Thompson, Pravina Mattoo, Yuan Zhang, and Gerardo G. Kaplan*

Laboratory of Hepatitis Viruses, Division of Viral Products, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, Maryland 20892

Received 12 March 1998/Accepted 13 May 1998

The hepatitis A virus cellular receptor 1 (HAVcr-1) cDNA was isolated from a cDNA expression library of African green monkey kidney (AGMK) cells by using protective monoclonal antibody (MAb) 190/4, which blocks the binding of hepatitis A virus (HAV) to AGMK cells. The HAVcr-1 cDNA codes for havcr-1, a 451-amino-acid class I integral-membrane mucin-like glycoprotein of unknown natural function. To determine the existence of a human homolog(s) of HAVcr-1 (huHAVcr-1), we used HAVcr-1-specific primers to amplify cDNAs from human liver and kidney mRNA by reverse transcription-PCR. Nucleotide sequence analysis revealed that the amplified liver and kidney huHAVcr-1 cDNAs were identical and that they coded for a 359-amino-acid glycoprotein, termed huhavcr-1, which was approximately 79% identical to havcr-1. The six Cys residues of the extracellular domain of havcr-1 and its first N-glycosylation site were conserved in huhavcr-1. However, the number of hexameric repeats of the mucin-like region was reduced from 27 in havcr-1 to 13 in huhavcr-1. In addition, 12 C-terminal amino acids in the cytoplasmic domain of huhavcr-1 were deleted. Northern blot analysis of poly(A) RNA showed that huhavcr-1 is expressed in every organ analyzed, including the liver, small intestine, colon, and spleen, and that it is expressed at higher levels in the kidney and testis. Although dog cells transfected with the huHAVcr-1 cDNA did not express the protective 190/4 epitope, they bound hepatitis A virus (HAV) and gained limited susceptibility to HAV infection. Treatment with MAb 190/4 did not protect AGMK cell transfectants expressing huhavcr-1 against HAV, suggesting that HAV infected these cells via the huhavcr-1 receptor and not the endogenously expressed havcr-1, which was blocked by MAb 190/4. Our data demonstrate that huhavcr-1 is a binding receptor for HAV and suggest that it is also a functional receptor for HAV.

* Corresponding author. Mailing address: Division of Viral Products, CBER-FDA, 8800 Rockville Pike, Bldg. 29A-NIH, rm. no. 1D10, HFM-448, Bethesda, MD 20892. Phone: (301) 827-1870. Fax: (301) 480-5326. E-mail: gk{at}helix.nih.gov.

J Virol, August 1998, p. 6621-6628, Vol. 72, No. 8
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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