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Expression of cGMP-dependent protein kinase inEscherichia coli

  • Protein Kinases
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Abstract

Cyclic GMP-dependent protein kinase (cGMP kinase) is involved in the relaxation of smooth muscle. The enzyme has been cloned and expressed in eukaryotic cell lines but so far not in prokaryotic cells. Three vectors were constructed for the expression of Iα cGMP kinase inEscherichia coli. Transformation with the pET3a/cgk vector which uses the T7 RNA polymerase/promotor system resulted in efficient accumulation of cGMP kinase. Most of the protein was in an insoluble and catalytic inactive form. Various solubilization and refolding conditions did not yield an active enzyme. A small fraction of the cGMP kinase was present in the soluble cell extract. This fraction bound cGMP with high affinity but had no cGMP stimulated kinase activity. To prevent aggregation two additional vectors were constructed. (I) A bacterial leader sequence, which directs the export of proteins into the periplasmic space, was fused to the aminoterminus of the cGMP kinase. (II) A gram/gram+ shuttle vector for expression under the control of the tac promotor was used. Both constructs directed the synthesis of an isoluble and inactive cGMP kinase. These results suggest that large amounts of cGMP kinase can be expressed inE. coli, but mainly in an isoluble and inactive form. In contrast to eukaryotic cells, bacteria may lack systems for correct protein folding and/or posttranslational modification that are crucial for the productive folding and/or activation of cGMP kinase.

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Authors and Affiliations

  1. Institut für Pharmakologie und Toxikologie, Technische Universität München, Biedersteiner Str. 29, 80802, München, Germany

    R. Feil, M. Bigl, P. Ruth & F. Hofmann

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  1. R. Feil
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  2. M. Bigl
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  3. P. Ruth
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  4. F. Hofmann
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Feil, R., Bigl, M., Ruth, P. et al. Expression of cGMP-dependent protein kinase inEscherichia coli . Mol Cell Biochem 127, 71–80 (1993). https://doi.org/10.1007/BF01076758

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