Differences in virus receptor for type I and type II feline infectious peritonitis virus

T. Hohdatsu, Yoshihiro Izumiya, Y. Yokoyama, K. Kida, H. Koyama

Research output: Contribution to journalArticlepeer-review

52 Scopus citations


Feline infectious peritonitis viruses (FIPVs) are classified into type I and type II serogroups. Here, we report that feline aminopeptidase N (APN), a cell-surface metalloprotease on the intestinal, lung and kidney epithelial cells, is a receptor for type II FIPV but not for type I FIPV. A monoclonal antibody (MAb) R-G-4, which blocks infection of Fells cams whole fetus (fcwf-4) cells by type II FIPV, was obtained by immunizing mice with fcwf-4 cells, which are highly susceptible to FIPV. This MAb also blocked infection of fcwf-4 cells by type II feline enteric coronavirus (FECV), canine coronavirus (CCV), and transmissible gastroenteritis virus (TGEV). On the other hand, it did not block infection by type I FIPVs. MAb R-G-4 recognized a polypeptide of relative molecular mass 120-130 kDa in feline intestinal brush-border membrane (BBM) proteins. The polypeptide possessed aminopeptidase activity, and the first 15 N-terminal amino acid sequence was identical to that of the feline APN. Feline intestinal BBM proteins and the polypeptide reacted with MAb R-G-4 (feline APN) inhibited the infectivity of type II FIPV, type II FECV, CCV and TGEV to fcwf-4 cells, but did not inhibit the infectivity of type I FIPVs.

Original languageEnglish (US)
Pages (from-to)839-850
Number of pages12
JournalArchives of Virology
Issue number5
StatePublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Genetics
  • Applied Microbiology and Biotechnology


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