Abstract
Sucrose phosphate synthase (SPS) is believed to be the key enzyme for controlling the biosynthesis of sucrose. SPSs consist of a functional glycosyltransferase domain that shares conserved residues with the glycosyltransferase domain of sucrose biosynthesis-related protein. The formation of sucrose-6-phosphate is catalyzed by SPS with the transfer of a glycosyl group of uridine diphosphate glucose (UDP-G) as an activated donor sugar to a fructose-6-phosphate as a sugar acceptor. However, understanding of the mechanism of catalytic and substrate binding in SPS is very limited. Based on amino acid sequence alignments with several enzymes that belong to the glycosyltransferase family, the UDP-G binding sites that might be critical for catalytic mechanism were identified. Here, we report that single point mutation of R496, D498, and V570 located in the proposed UDP-G binding site led to less active or complete loss of enzyme activity. Through structure-based site-directed mutagenesis and biochemical studies, the results indicated that these residues contribute to the catalytic activity of plant SPS. Moreover, understanding of the UDP-G binding site provides an insight into new strategies for enzyme engineering and redesigning a catalytic mechanism for UDP.
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Abbreviations
- F6P:
-
Fructose-6-phophate
- G6P:
-
Glucose-6-phosphate
- SPS:
-
Sucrose phosphate synthase
- UDP-G:
-
Uridine diphosphate glucose;
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Acknowledgements
This work was supported by Ministry of Research, Technology and Higher Education of the Republic of Indonesia (Penelitian Unggulan Strategis Nasional and Penelitian Dasar Unggulan Perguruan Tinggi) and by the International Collaborative Research Program of Institute for Protein Research, Osaka University, ICR-14-03 and 05, Japan.
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Widhi Dyah Sawitri declares that she has no conflicts of interest. Siti Nurul Afidah declares that she has no conflicts of interest. Atsushi Nakagawa declares that he has no conflicts of interest. Toshiharu Hase declares that he has no conflicts of interest. Bambang Sugiharto declares that he has no conflicts of interest.
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This article is part of a Special Issue on ‘Biomolecules to Bio-nanomachines - Fumio Arisaka 70th Birthday’ edited by Damien Hall, Junichi Takagi and Haruki Nakamura.
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Sawitri, W.D., Afidah, S.N., Nakagawa, A. et al. Identification of UDP-glucose binding site in glycosyltransferase domain of sucrose phosphate synthase from sugarcane (Saccharum officinarum) by structure-based site-directed mutagenesis. Biophys Rev 10, 293–298 (2018). https://doi.org/10.1007/s12551-017-0360-9
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DOI: https://doi.org/10.1007/s12551-017-0360-9