NDLI: Functional characterization of cis-acting elements mediating flavone-inducible expression of CYP321A1.

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Functional characterization of cis-acting elements mediating flavone-inducible expression of CYP321A1.

Content Provider	Semantic Scholar
Author	Zhang, Chunni Luo, Xiangxia Ni, Xinzhi Zhang, Yalin. Li, Xianchun
Copyright Year	2010
Abstract	How plant allelochemicals elicit herbivore counterdefense genes remains largely unknown. To define the cis-acting elements for flavone inducibility of the allelochemical-metabolizing CYP321A1 from Helicoverpa zea, functions of varying length of CYP321A1 promoter are examined in H. zea fatbody cells. Progressive 3' deletions reveal presence of positive elements in the 5' untranslated region (UTR). Progressive 5' deletions map out regions of one essential element, four enhancers, and two silencers. Further progressive 5'deletions localize the essential element to a 36-bp region from -109 to -74. This essential element, designated as xenobiotic response element to flavone (XRE-Fla), contains a 5' AT-only TAAT inverted repeat, a GCT mirror repeat and a 3' antioxidant response element-like element. Internal deletions and substitution mutations show that the TAAT repeat is only necessary for the maximal flavone inducibility, whereas the other two components are necessary for the basal and flavone-induced expression of CYP321A1. Electrophoresis mobility shift assays demonstrate that XRE-Fla specifically binds to H. zea fatbody cell nuclear extracts and flavone treatment increases the nuclear concentrations of the yet-to-be characterized transcription factors binding to XRE-Fla. Taken together, CYP321A1 expression is regulated primarily by XRE-Fla and secondarily by other cis elements scattered in its promoter and 5' UTR.
Starting Page	898
Ending Page	908
Page Count	11
File Format	PDF HTM / HTML
DOI	10.1016/j.ibmb.2010.09.003
PubMed reference number	20854909
Journal	Medline
Volume Number	40
Issue Number	12
Alternate Webpage(s)	https://pubag.nal.usda.gov/download/48850/PDF
Alternate Webpage(s)	https://doi.org/10.1016/j.ibmb.2010.09.003
Journal	Insect biochemistry and molecular biology
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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