Abstract
The sorbitol-6-phosphate dehydrogenase (S6PDH) is a key enzyme for sorbitol synthesis and plays an important role in the alleviation of salinity stress in plants. Despite the huge significance, the structure and the mode of action of this enzyme are still not known. In the present study, sequence analysis, cloning, expression, activity assays and enzyme kinetics using various substrates (glucose-6-phosphate, sorbitol-6-phosphate and mannose-6-phosphate) were performed to establish the functional role of S6PDH protein from rice (Oryza sativa). For the structural analysis of the protein, a comparative homology model was prepared on the basis of percentage sequence identity and substrate similarity using the crystal structure of human aldose reductase in complex with glucose-6-phosphate and NADP+ (PDB ID: 2ACQ) as a template. Molecular docking was performed for studying the structural details of substrate binding and possible enzyme mechanism. The cloned sequence resulted into an active recombinant protein when expressed into a bacterial expression system. The purified recombinant protein was found to be active with glucose-6-phosphate and sorbitol-6-phosphate; however, activity against mannose-6-phosphate was not found. The K m values for glucose-6-phosphate and sorbitol-6-phosphate were found to be 15.9 ± 0.2 and 7.21 ± 0.5 mM, respectively. A molecular-level analysis of the active site of OsS6PDH provides valuable information about the enzyme mechanism and requisite enantioselectivity for its physiological substrates. Thus, the fundamental studies of structure and function of OsS6PDH could serve as the basis for the future studies of bio-catalytic applications of this enzyme.
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Abbreviations
- S6PDH:
-
Sorbitol-6-phosphate dehydrogenase
- OsS6PDH:
-
Sorbitol-6-phosphate dehydrogenase of rice
- G-6-P:
-
Glucose-6-phosphate
- S-6-P:
-
Sorbitol-6-phosphate
- M-6-P:
-
Mannose-6-phosphate
- ROAD:
-
Rice oligonucleotide array database
- PDB:
-
Protein data bank
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Acknowledgements
The authors wish to thank Department of Biotechnology, IIT Roorkee for providing cloning and computational facilities. This work has been supported financially by Department of Biotechnology (DBT), India. Rajbala thanks Ministry of Human Resource Development (MHRD), India for the financial support. We also thank Dr P. Selvakumar and Ms Sonali Dhindwal for helpful discussions.
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425_2014_2076_MOESM1_ESM.jpg
Sup fig. 1 HPLC chromatograms showing the increased concentration of sorbitol in salt-stressed rice plants.(a) HPLC chromatogram of control plant (b) HPLC chromatogram of salt-stressed (150 mM) plant.(JPEG 125 kb)
425_2014_2076_MOESM2_ESM.tif
Sup Fig. 2 The comparative stereo view of OsS6PDH (full-length) and OsS6PDH (without N-terminal extension) showing the inhibition of active sites by N-terminal. N-terminal extension has been shown in yellow. Protein (without N-terminal extension) shown in a, c and e is active while in case of the protein (full-length) shown in b, d and f, N-terminal extension inhibits the active sites and substrate-binding sites. (TIFF 1616 kb)
425_2014_2076_MOESM3_ESM.png
Sup fig. 3 phyre 2 model of protein showing comparative folding in case of without N-terminal extension (a and c) and with N-terminal extension (b and d). (PNG 667 kb)
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Yadav, R., Prasad, R. Identification and functional characterization of sorbitol-6-phosphate dehydrogenase protein from rice and structural elucidation by in silico approach. Planta 240, 223–238 (2014). https://doi.org/10.1007/s00425-014-2076-4
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DOI: https://doi.org/10.1007/s00425-014-2076-4