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Purification of Staphylococcus aureus beta-lactamases by using sequential cation-exchange and affinity chromatography
D S Kernodle1, D J Zygmunt, P A McGraw
1Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee 37232.
Antimicrobial Agents and Chemotherapy
|November 1, 1990
Summary
Phenylboronic acid-agarose chromatography was optimized to purify Staphylococcus aureus beta-lactamases. Modifications to buffers and column size, along with a two-stage purification process, successfully isolated four beta-lactamase variants.
Area of Science:
- Biochemistry
- Enzymology
- Microbiology
Background:
- Boronic acids are known active-site inhibitors of serine beta-lactamases.
- Phenylboronic acid-agarose affinity chromatography has been used for beta-lactamase purification from bacterial extracts.
Purpose of the Study:
- To optimize phenylboronic acid-agarose chromatography for purifying Staphylococcus aureus beta-lactamase.
- To address challenges in previous single-step purification protocols.
Main Methods:
- Modified buffers and increased affinity column dimensions.
- Employed a two-stage purification: cation-exchange chromatography followed by affinity chromatography.
- Purified four variants of Staphylococcus aureus beta-lactamase.
Main Results:
- Overcame non-active-site adsorption and low affinity issues.
- Achieved specific activities for beta-lactamase variants A, B, C, and D: 44.6, 12.2, 10.6, and 30.8 µmol/min/mg, respectively.
- Observed dimer formation in type D beta-lactamase, likely due to cysteine cross-linking.
Conclusions:
- A modified two-stage chromatographic approach is effective for purifying Staphylococcus aureus beta-lactamases.
- Understanding enzyme-support interactions and affinity is crucial for successful purification.
- Characterized specific activities and potential dimerization of different beta-lactamase variants.
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