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• W2081027761 abstract "A cephalosporin acetylesterase produced by Bacillus subtilis was immobilized by adsorption onto bentonite. The immobilized enzyme (E I ) and the soluble enzyme (E S ) exhibited Michaelis-Menton kinetics with 7-aminocephalosporanic acid (7-ACA): K m = 2.8 × 10 −3 M and K m = 3.2 × 10 −3 M, respectively. Similar kinetics were observed with 7-(thiophene-2-acetamido)cephalosporanic acid (cephalothin), but the K m value measured with E I (3.7 × 10 −3 M) was less than one-half that measured with this substrate and E S . The reduction in K m value was correlated with the ability of bentonite to adsorb cephalothin. The reaction products, acetate and deacetyl-7-ACA, were weak competitive inhibitors of E S and E I . The K i values for E I were 5.0 × 10 −2 M for acetate and 3.6 × 10 −2 M for deacetyl-7-ACA. Similar values were measured with E S and these substrates. E I retained about 80% of its initial activity after 3 weeks of storage in solution at 25 C. However, the enzyme dissociated from the bentonite particles during the deacetylation reaction. This dissociation was minimized by cross-linking E I with glutaraldehyde or bis-dimethyladipimidate, or by adding Al(OH) 3 to the suspension. With the latter addition, E I was stabilized so that it could be reused nine times before one-half of the initial activity was lost." @default.
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• W2081027761 date "1975-09-01" @default.
• W2081027761 modified "2023-10-16" @default.
• W2081027761 title "Preparation and Properties of a Cephalosporin Acetylesterase Adsorbed onto Bentonite" @default.
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• W2081027761 doi "https://doi.org/10.1128/aac.8.3.282" @default.
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