1. Two-step procedure for purification and separation of the essential penicillin-binding proteins PBP 1A and 1Bs of Escherichia coli.
- Author
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von Rechenberg M and Höltje JV
- Subjects
- Hexosyltransferases metabolism, Multienzyme Complexes metabolism, Penicillin-Binding Proteins, Peptidyl Transferases metabolism, Bacterial Proteins, Carrier Proteins, Escherichia coli metabolism, Hexosyltransferases isolation & purification, Multienzyme Complexes isolation & purification, Muramoylpentapeptide Carboxypeptidase, Peptidyl Transferases isolation & purification
- Abstract
The penicillin-binding proteins PBP 1A and 1Bs are the essential murein polymerases of Escherichia coli. Purification of these membrane-bound bifunctional transglycosylase-transpeptidases was a major obstacle in studying the details of both enzymatic reactions. Here we describe a simple, highly specific affinity chromatography method that takes advantage of the availability of the specific inhibitor of the transglycosylase site moenomycin A in order to enrich PBP 1A and 1Bs in one step from crude membrane preparations. Separation of PBP 1A from PBP 1Bs is achieved in a second step employing cation exchange chromatography yielding enzymatically active native murein polymerases.
- Published
- 2000
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