Transcriptome-wide identification of squalene epoxidase genes from Glycyrrhiza glabra L.: expression analysis and heterologous expression of GgSQE1 suggest important role in terpenoid biosynthesis
Squalene epoxidase (SQE) is a crucial regulatory enzyme for the biosynthesis of several important classes of compounds including sterols and triterpenoids. The present paper identified and characterised five SQE genes ( GgSQE1 to GgSQE5 ) from Glycyrrhiza glabra through transcriptome data mining and...
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Published in | Protoplasma Vol. 258; no. 5; pp. 991 - 1007 |
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Main Authors | , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Vienna
Springer Vienna
01.09.2021
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Squalene epoxidase (SQE) is a crucial regulatory enzyme for the biosynthesis of several important classes of compounds including sterols and triterpenoids. The present paper identified and characterised five SQE genes (
GgSQE1
to
GgSQE5
) from
Glycyrrhiza glabra
through transcriptome data mining and homology-based cloning, for the first time
.
The phylogenetic analysis implied their functional divergence
.
The ORF corresponding to one of the five SQEs, namely,
GgSQE1
, was cloned and studied for its function in a heterologous system, following transient and stable expressions. The transient expression followed by Gg
SQE1
encoding protein purification suggested approximately 58.0-kDa protein following the predicted molecular mass of the deduced protein. The gene expression profiling based on qRT-PCR indicated its highest expression (6.4-folds) in the 10-month-old roots. Furthermore, ABA (12.4-folds) and GA
3
(2.47) treatments upregulated the expression of
GgSQE1
in the shoots after 10 and 12 hours, respectively, which was also reflected in glycyrrhizin accumulation. The inductive effects of ABA and GA
3
over
GgSQE1
expression were also confirmed through functional analysis of
GgSQE1
promoters using GUS fusion construct. Stable constitutive expression of
GgSQE1
in
Nicotiana tabacum
modulated the sterol contents. The study could pave the way for understanding the metabolic flux regulation concerning biosynthesis of related sterols and triterpenoids. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Handling Editor: Handling Editor: Peter Nick |
ISSN: | 0033-183X 1615-6102 |
DOI: | 10.1007/s00709-021-01616-2 |