Abstract
Anthocyanidin synthase (ANS) is one of the key enzymes in the biosynthesis of both anthocyanins and proanthocyanidins in grapevine. Although substantial researches have investigated ANS gene expression and regulation at the transcriptional level, little is yet known about protein expression and distribution in grapevine. Here, the expression and tissue and subcellular localization of ANS in different Cabernet sauvignon grapevine tissues were investigated by using the techniques of Western blotting, immunohistochemical localization, immuno-electron microscopy, and confocal microscopy. The results showed that the ANS was expressed in the grape berries, leaves, stems, petioles, and leaf buds. In grape berry skin and flesh, ANS expression is developmental dependent. Immunohistochemical analysis revealed that ANS is primarily distributed in the exocarp, mesocarp, and seed of the fruit; in palisade and spongy tissues of the leaves; in the primary phloem and pith ray in the stems; and in the growth point and leaf primordium of the leaf buds. Furthermore, at the subcellular level, the ANS was mainly localized in the cytoplasm regardless of cell types and some ANS were also found in the nucleus in the mesocarp vascular bundle and leaf bud cells. This research will give further insight for the biosynthesis and regulation of different flavonoid compounds in grapevine.
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Abbreviations
- ANR:
-
Anthocyanidin reductase
- ANS:
-
Anthocyanidin synthase
- BSA:
-
Bovine serum albumin
- F3′5′H:
-
Flavonoid 3′, 5′-hydroxylase
- IgG:
-
Immunoglobulin fractions
- PAs:
-
Proanthocyanidins
- PBS:
-
Phosphate-buffered saline
- RSR:
-
Regular salt rinse solution
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (grant numbers 30871747) and major program of Beijing Municipal Science and Technology Commission (no. D07060500160701).
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The authors declare that they have no conflict of interest.
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Handling Editor: Hanns H. Kassemeyer
Huiling Wang and Wei Wang contribute equally to this work.
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Supplementary Fig. 1
Scheme of the grapevine seedling to show the experimental sampling sites, including: leaf bud, stem tip, leaf, root, stem (stem phloem and stem xylem). (GIF 345 kb)
Supplementary Fig. 2
Subcellular localization of ANS–GFP fusion protein in the Arabidopsis protoplasts. ANS–GFP fusion protein was transiently expressed from its chimeric gene, and the localization of the fusion proteins was detected by confocal laser scanning microscopical imaging of GFP fluorescence. a–c Transient expression of the green fluorescent protein (GFP)–ANS fusion protein showing that the fusion protein was localized to the cytoplasm. d–f GFP of PEZS-NL empty vector expressed in the Arabidopsis protoplast, and no fluorescences were observed in the control protoplasts. The laser-scanning confocal microscopy images are the ANS–GFP fluorescence (a, d), merged images (b, e), and bright-field image (c, f) (GIF 128 kb)
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Wang, H., Wang, W., Li, H. et al. Expression and tissue and subcellular localization of anthocyanidin synthase (ANS) in grapevine. Protoplasma 248, 267–279 (2011). https://doi.org/10.1007/s00709-010-0160-6
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DOI: https://doi.org/10.1007/s00709-010-0160-6