Abstract
Two full-length hexokinase (HXK, EC 2.7.1.1) cDNAs, VvHXK1 with 1,413 bp and VvHXK2 with 1,458 bp were cloned from grape berries (Vitis vinifera L. Cabernet Sauvignon). VvHXK1 and VvHXK2 genes sequence from grape berries were deposited in GenBank under the accession number JN118544 and JN118545, respectively. The homology of the amino acid of VvHXK1 or VvHXK2 was very similar to ‘Pinot Noir’ grape HXK sequence, their similarties were 99.36 % and 98.97 %, respectively. More intuitive phylogenetic tree showed that the homology of amino acid sequence VvHXK1 with melon CmHXK1 was 86 %, and VvHXK2 homology with rice OsHXK3 was 83 %. The HXK proteins were successfully expressed in plasmid pET-30a (+) vectors in Escherichia coli BL21 (DE3) pLysS. The expressed proteins were purified using Ni-NTA agarose column and used to produce HXK1 antibody and conducted HXK protein blotting analysis. The results,suggested that one polypeptide band of about 51 kDa HXK protein can be detected in grape berries, HXK protein level was the highest during early grape berry development, but the lowest from 50d to 60d during development. Biochemical analysis of two hexokinase isozymes indicated that glucose was the optimal substrate of HXK, The isoelectric points of the two isozymes were 5.8 and 5.6, respectively. And the optimum pH was about 8.0. These results provide a substantial basis for the further studies of functions of grape HXKs to manipulate sugar content of grape berries.
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Abbreviations
- HXK:
-
Hexokinase
- IPTG:
-
Isopropyl-β-D-thiogalactoside
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This research was supported by the National Natural Science Foundation of China (Grants No. 30871698 and No. 31071764).
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Yu, F., Li, L.M., Yang, P.P. et al. Hexokinase from grape berries: its prokaryotic expression, polyclonal antibody preparation and biochemical property analyses. J. Plant Biochem. Biotechnol. 22, 324–334 (2013). https://doi.org/10.1007/s13562-012-0163-9
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DOI: https://doi.org/10.1007/s13562-012-0163-9