Effects of disulphide bridges on the activity and stability of the formate dehydrogenase from <Emphasis Type="Italic">Candida methylica</Emphasis> |
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Authors: | Nevin Gül Karagüler Richard B Sessions Anthony R Clarke |
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Institution: | (1) Department of Molecular Biology and Genetics, Faculty of Science and Letters, Istanbul Technical University, Istanbul, Turkey;(2) Department of Biochemistry, School of Medical Sciences, University Walk, Bristol, BS8 1TD, UK |
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Abstract: | Wild-type cmFDH contains no cystines, hence it is a good candidate to test the hypothesis that thermostability can be achieved by introducing
new disulphide bridges. Three cysteine double mutants of cmFDH were designed, using a homology model reported previously, to introduce cystine bridges in the C-domain (T169C–T226C)
in the N-domain (V88C–V112C) and between the two monomers (M156C–L159C) to form two cystine bridges across the dimer interface.
These mutants were constructed and the proteins were over-expressed in E. coli. The mutants V88C–V112C and M156C–L159C lost FDH activity. The mutant T169C–T226C was both less active and less thermostable
than wild-type FDH. |
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Keywords: | Candida methylica Disulphide bonds Formate dehydrogenase Modelling |
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