Overproduction of fungal ribotoxin alpha-sarcin in Escherichia coli: generation of an active immunotoxin.
Gene
; 190(1): 31-5, 1997 Apr 29.
Article
em En
| MEDLINE
| ID: mdl-9185846
ABSTRACT
alpha-Sarcin is a ribonucleolytic protein secreted by the mold Aspergillus giganteus. DNA encoding alpha-sarcin was isolated from the host and cloned into T7 promoter based E. coli expression vectors. Using bacterial outer membrane protein A (OmpA) signal sequence, properly processed recombinant (re-) protein was secreted into the culture medium while in the absence of a signal sequence protein remained insoluble in the bacterial inclusion bodies. The re-alpha-sarcin was purified to homogeneity by simple chromatographic techniques both from the insoluble and soluble sources with respective yields of 40-50 microg/ml and 2-3 microg/ml. The re-ribotoxin was functionally as active as the native toxin and preserved its specificity. The re-alpha-sarcin was used in the construction of an active immunotoxin targeted at the human cancer cells overexpressing transferrin receptor (TFR).
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Aspergillus
/
Proteínas Fúngicas
/
Imunotoxinas
/
Endorribonucleases
Idioma:
En
Revista:
Gene
Ano de publicação:
1997
Tipo de documento:
Article
País de afiliação:
Índia