An acyl-carrier-protein-thioesterase domain from the 6-deoxyerythronolide B synthase of Saccharopolyspora erythraea. High-level production, purification and characterisation in Escherichia coli |
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Authors: | P Caffrey B Green L C Packman B J Rawlings J Staunton P F Leadlay |
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Affiliation: | Department of Biochemistry, University of Cambridge, England. |
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Abstract: | The C-terminal region of a multifunctional polypeptide from the 6-deoxyerythronolide B synthase of Saccharopolyspora erythraea is predicted to contain an acyl carrier protein and a thioesterase or acyltransferase activity [Cortes, J., Haydock, S. F., Roberts, G. A., Bevitt, D. J. & Leadlay, P. F. (1990) Nature 348, 176-178]. Site-directed mutagenesis by means of the polymerase chain reaction was used to construct an efficient pT7-based expression plasmid for this domain. The recently developed technique of electrospray mass spectrometry was used to demonstrate that the purified protein had not been post-translationally modified by attachment of a 4'-phosphopantetheine group. However, treatment with the serine proteinase inhibitor phenylmethylsulphonyl fluoride led to highly selective labelling of the predicted active site of the thioesterase or acyltransferase. |
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