Abstract
The gene for ricin toxin A chain was modified by site-specific mutagenesis to change arginine 180 to alanine, glutamine, methionine, lysine, or histidine. Separately, glutamic acid 177 was changed to alanine and glutamic acid 208 was changed to aspartic acid. Both the wild-type and mutant proteins were expressed in Escherichia coli and, when soluble, purified and tested quantitatively for enzyme activity. A positive charge at position 180 was found necessary for solubility of the protein and for enzyme activity. Similarly, a negative charge with a proper geometry in the vicinity of position 177 was critical for ricin toxin A chain catalysis. When glutamic acid 177 was converted to alanine, nearby glutamic acid 208 could largely substitute for it. This observation provided valuable structural information concerning the nature of second-site mutations.
MeSH Terms
Animals
Arginine
Escherichia coli/genetics
Glutamates
Glutamic Acid
Kinetics
Models, Molecular
Mutagenesis, Site-Directed
Plasmids
Protein Biosynthesis/drug effects
Protein Conformation
Rabbits
Recombinant Proteins/isolation & purification,pharmacology
Reticulocytes/drug effects,metabolism
Ribosomes/drug effects,metabolism
Ricin/genetics,isolation & purification,pharmacology
Saccharomyces cerevisiae/genetics,growth & development
Chemicals
Glutamates
Recombinant Proteins
Glutamic Acid
Ricin
Arginine
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Frankel A
Florida Hospital Cancer, Altamonte Springs.
Welsh P
Richardson J
Robertus J D
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