Abstract
NADP-dependent chloroplastic malate dehydrogenase (E.C.1.1.1.82) is regulated by thiol disulfide-interchange with thioredoxin. It displays two regulatory disulfides per subunit, located in specific sequence extensions respectively at the N- and C-terminal ends of each subunit. In the present study, attempts were made to transfer the regulatory properties of sorghum NADP-malate dehydrogenase to a constitutively active NAD-dependent malate dehydogenase (E.C.1.1.1.37) from the thermophilic bacteria Thermus flavus, by grafting the regulatory extensions of the former to the latter. The results demonstrate that a successful transfer of redox regulation properties requires the grafting of both full-length extensions, but also the introduction of specific hydrophobic residues in the core part of the protein. These residues are very likely involved in the interaction between monomers, and structural changes at the active site.
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Abbreviations
- MDH:
-
Malate dehydrogenase
- PCR:
-
Polymerase chain reaction
- TRX:
-
Thioredoxin
- WT:
-
Wild-type
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Acknowledgments
We are grateful to E. Keryer for skillful technical assistance and to Prof. T. Beppu and Dr. M. Nishiyama (Tokyo University) for the gift of the T. flavus NAD-MDH clone and the mdh-E. coli strain.
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Issakidis-Bourguet, E., Lavergne, D., Trivelli, X. et al. Transferring redox regulation properties from sorghum NADP-malate dehydrogenase to Thermus NAD-malate dehydrogenase. Photosynth Res 89, 213–223 (2006). https://doi.org/10.1007/s11120-006-9094-4
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DOI: https://doi.org/10.1007/s11120-006-9094-4