期刊
INSECT SCIENCE
卷 23, 期 2, 页码 297-304出版社
WILEY
DOI: 10.1111/1744-7917.12210
关键词
Bombyx mori; Cecropin A1 promoter; immune challenges; B motif; Relish
类别
资金
- National Basic Research Program of China [2012CB114600]
- National Natural Science Foundation of China [31201854]
Cecropin A1 (CecA1) promoter from Bombyx mori was cloned and characterized to provide insight into the transcriptional control of this antimicrobial peptide gene upon immune challenges. Reporter gene assays demonstrated that both Escherichia coli and lipopolysaccharide could induce expression in BmE cells but B. bombyseptieus or peptidoglycan failed, and the induction pattern of the reporter gene was coincident with the endogenous CecA1. Analysis of deletion and mutation constructs revealed that the regulatory region was the B motif located between -176 and -166, and no other predicted elements on CecA1 promoter affected its inducibility. Insertion of additional B motifs increased the activity of CecA1 promoter. Furthermore, binding of Relish to B motif was confirmed by electrophoretic mobility shift assay. These findings indicate the regulatory mechanism of CecA1 expression in IMD pathway and suggest an approach of engineering antimicrobial peptide promoter with enhanced activities that may lead to broad applications.
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