The genome of cowpox virus contains a gene related to those encoding the epidermal growth factor, transforming growth factor alpha and vaccinia growth factor.
Cowpox virus (CPV) is a member of the Orthopoxvirus genus and has the genetic capacity to encode a multitude of genes that interfere with the host inflammatory and immune response or modulate the physiological state of infected and non-infected cells. Among these CPV factors are receptors homologous to interferon and tumor necrosis factor receptors and also a viral cellular serine-proteinase analog. Here we describe the detection of a CPV gene that encodes a protein homologous to epidermal growth factor, transforming growth factor alpha and poxvirus growth factors, such as the vaccinia growth factor (VGF). The VGF and other poxvirus growth factors are produced early in the infection and are secreted into the medium where they bind to the EGF receptors, generating mytotic responses. The cowpox growth factor (CGF) gene was detected in three copies on the virus genome by PCR, and by northern and southern blot hybridization using VGF nucleotide sequences as primers and probes. The CPV gene has a strong nucleotide and predicted amino acid similarity with VGF, and is also produced early in the infection.
da Fonseca
F G
FG
Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brasil.
Silva
R L
RL
Marques
J T
JT
Ferreira
P C
PC
Kroon
E G
EG
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002417:Cattle; D002522:Chlorocebus aethiops; D015608:Cowpox virus / Q000235:genetics*; D004279:DNA, Viral; D004815:Epidermal Growth Factor / Q000235:genetics*; D005814:Genes, Viral; D016679:Genome, Viral; D006133:Growth Substances / Q000235:genetics*; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins; D008969:Molecular Sequence Data; D010455:Peptides / Q000235:genetics*; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid; D016211:Transforming Growth Factor alpha / Q000235:genetics*; D014709:Vero Cells; D014764:Viral Proteins
D004279:DNA, Viral; D006133:Growth Substances; D036341:Intercellular Signaling Peptides and Proteins; D010455:Peptides; D016211:Transforming Growth Factor alpha; D014764:Viral Proteins; C121155:cowpox virus growth factor; C051087:vaccinia growth factor; D004815:Epidermal Growth Factor