Abstract
A novel, systematic method (1, 2) to induce new catalytic activities in proteins, has been shown to generate esterase activities from bovine pancreatic ribonuclease (RNase) (3, 4). The conformation of RNase is perturbed by exposure to pH 3. 0, followed by the addition of a known competitive inhibitor of chymotrypsin, namely indole-3-propionic acid (IPA). The newly formed conformation is preserved by cross-linking with glu-taraldehyde. The modified-RNase preparations hydrolyzed L-tryptophan ethyl ester (L-TrEE) optimally at two pH values, 6.0 (acid-esterase) and 7.5 (neutral-esterase). The two es-terase activities have been separated by ammonium sulfate precipitation, and further purified by gel chromatography on Biogel P-30. Nearly 100 fold purification of both the ester-ases was achieved by these two steps. The highest activities for the purified esterases were observed with amino acid esters containing aromatic side chains. With these substrates, both esterases exhibited Michaelis-Menten kinetics. While the acid-esterase hydrolyzed L-TrEE, benzoyl-L-arginine ethyl ester (BAEE) and L-tyrosine ethyl ester (L-TEE) equally well, the neutral-esterase had a much higher activity towards L-TrEE than the other two substrates. Tryptophan competitively inhibited the acid-esterase, but did not affect the neutral-esterase at a concentration up to 2 mM.
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Saraswathi, S., Keyes, M.H. (1985). A Systematic Approach to Induce New Catalytic Activities in Proteins. In: Gebelein, C.G., Carraher, C.E. (eds) Polymeric Materials in Medication. Polymer Science and Technology, vol 32. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2245-8_21
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DOI: https://doi.org/10.1007/978-1-4899-2245-8_21
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