Abstract
The streptococcal enzyme that catalyzes the last step in proline biosynthesis was heterologously expressed and the recombinant protein was purified to electrophoretic homogeneity and characterized thoroughly. As for δ1-pyrroline-5-carboxylate reductases from other sources, it was able to use either NADH or NADPH as the electron donor in vitro. However, with NADH the activity was markedly inhibited by physiological levels of NADP+. Results also strengthen the possibility that an unusual ordered substrate binding occurs, in which the dinucleotide binds last.
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Acknowledgments
This work was supported by the University of Ferrara within the frame of the project FAR2010. Davide Petrollino acknowledges an applied research fellowship from Spinner Consortium, Emilia Romagna Region. The authors are indebted with Dr Bogusław Nocek (Midwest Center for Structural Genomics, Argonne IL 60439, USA) for providing the pMCSG7 vector bearing the Streptococcus pyogenes P5CR gene.
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The authors declare that they have no conflict of interest.
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Petrollino, D., Forlani, G. Coenzyme preference of Streptococcus pyogenes δ1-pyrroline-5-carboxylate reductase: evidence supporting NADPH as the physiological electron donor. Amino Acids 43, 493–497 (2012). https://doi.org/10.1007/s00726-011-1077-x
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DOI: https://doi.org/10.1007/s00726-011-1077-x