| Literature DB >> 2689871 |
D Schlossman1, D Withers, P Welsh, A Alexander, J Robertus, A Frankel.
Abstract
The gene for the A chain of ricin toxin was fused to a beta-galactosidase marker cistron via a DNA sequence encoding a short collagen linker, and the tripartite fusion protein was expressed in Escherichia coli. Site-specific mutagenesis was used to change glutamic acid residue 177 to aspartic acid or alanine. When the mutant proteins were expressed, purified, and tested quantitatively for enzymatic activity, the carboxylate function at position 177 was found not to be absolutely essential for ricin toxin A-chain catalysis.Entities:
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Year: 1989 PMID: 2689871 PMCID: PMC363653 DOI: 10.1128/mcb.9.11.5012-5021.1989
Source DB: PubMed Journal: Mol Cell Biol ISSN: 0270-7306 Impact factor: 4.272