Functional analysis of the promoter of a UDP-glycosyltransferase gene from Panax quinquefolius
Glycosyltransferases, a multigene superfamily in plants, are necessary to synthesize, modify and diversify specific ginsenosides in Panax quinquefolius. P. quinquefolius is widely used in medicine and nutrition. Various glycosyltransferases catalyze glycosylation to modify the pharmacological and bi...
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Published in | Plant cell, tissue and organ culture Vol. 135; no. 3; pp. 381 - 393 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Dordrecht
Springer Netherlands
01.12.2018
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Glycosyltransferases, a multigene superfamily in plants, are necessary to synthesize, modify and diversify specific ginsenosides in
Panax quinquefolius. P. quinquefolius
is widely used in medicine and nutrition. Various glycosyltransferases catalyze glycosylation to modify the pharmacological and biological activity of ginsenosides in ginseng plants. Two UDP-glycosyltransferase genes in
P. quinquefolius, Pq3-O-UGT1
and
Pq3-O-UGT2
(Genbank accession Nos. KR028477, KR106207), have been isolated and identified, but the signal transduction and transcriptional control mechanisms of glycosyltransferase genes have not yet been fully identified. To understand the expression and regulatory mechanism of
Pq3-O-UGT1
, we isolated a 2,611-bp upstream sequence of
Pq3-O-UGT1
gene from
P. quinquefolius
using genome walking method. The result of sequence analysis indicated
Pq3-O-UGT1
promoter included many essential putative
cis
-elements that may be responsible for the spatial and temporal expression. The full-length promoter fragment and its 5′-deletions were merged with the β-glucuronidase (GUS) reporter gene and transferred into tobacco plants to test their activities. The results of histochemical staining and fluorometric determination indicated that the full-length promoter was found to induce GUS expression preferentially in tender leaf, bud, petiole and stem with much lower activity than the cauliflower mosaic virus 35S promoter. Moreover, promoter deletion analysis revealed that the minimal promoter containing 487-bp fragment was sufficient to strongly activate GUS expression. The promoter activity of P-487 (7.6 nmol MU/min/µg protein) was approximately 90 times more than that of full-length fragment. Furthermore, it was found that the promoter activity can be enhanced by SA, GA, NAA and the expression of P-2246 was enhanced by light, but insignificant change was detected in drought treatment. These findings will help us to better understand the regulatory mechanisms of the upstream region of the
Pq3-O-UGT1
gene and provide useful information for further investigation of the molecular mechanisms of glycosylation in ginseng plants. |
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ISSN: | 0167-6857 1573-5044 |
DOI: | 10.1007/s11240-018-1471-0 |