Hemorrhage in lesions caused by cowpox virus is induced by a viral protein that is related to plasma protein inhibitors of serine proteases - PubMed (original) (raw)

Hemorrhage in lesions caused by cowpox virus is induced by a viral protein that is related to plasma protein inhibitors of serine proteases

D J Pickup et al. Proc Natl Acad Sci U S A. 1986 Oct.

Abstract

Several recombinant cowpox viruses were constructed and used to identify a viral gene that controls the production of hemorrhage in lesions caused by the Brighton Red strain of cowpox virus (CPV-BR). This gene is located in the KpnD fragment of CPV-BR DNA, between 31 and 32 kilobases from the end of the genome. This position corresponds well with that predicted from analyses of the DNA structures of spontaneously generated deletion mutants. The gene responsible for hemorrhage encodes a 38-kDa protein that is one of the most abundant early gene products. The 11-base-pair sequence GAAAATATATT present 84 base pairs upstream of its coding region is also present upstream of three other early genes of vaccinia virus; therefore, this sequence may be involved in the regulation of transcription. There is extensive similarity between the predicted amino acid sequence of the 38-kDa protein and the amino acid sequences of several plasma proteins that are inhibitors of various serine proteases involved in blood coagulation pathways. This suggests that the viral protein may possess a similar biological activity, which may enable it to effect hemorrhage by inhibiting one or more of the serine proteases involved in the host's normal processes of blood coagulation and wound containment.

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