1887

Abstract

We succeeded in producing human gamma interferon (IFN-γ) in tobacco protoplasts in quantity using genetically engineered brome mosaic virus (BMV strain ATCC66). This strain of BMV produces two types of coat protein, a full-length coat protein (20K) and a truncated coat protein (19K) which are translated from the first and second initiation codons, respectively. We replaced the truncated coat protein gene with the IFN-γ gene and synthesized BMV-IFN-γ chimera RNAs using an transcription system. The BMV-IFN-γ chimera RNAs were used to inoculate tobacco protoplasts together with BMV RNA 1 and RNA 2 and produced IFN-γ to a level of 5 to 10% of total extracted proteins per infected protoplast after 24 h of incubation. The efficient production of IFN-γ was attributed to the high translation activity of the BMV-IFN-γ chimera RNA. We demonstrate that 24 nucleotides coding for the N-terminal amino acids of the full-length coat protein were probably involved in the high translation activity of the BMV-IFN-γ chimera RNA.

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/content/journal/jgv/10.1099/0022-1317-74-7-1255
1993-07-01
2019-11-22
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http://instance.metastore.ingenta.com/content/journal/jgv/10.1099/0022-1317-74-7-1255
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