Insect Immunity. Two 17 Bp Repeats Nesting a Kappa B-related Sequence Confer Inducibility to the Diptericin Gene and Bind a Polypeptide in Bacteria-challenged Drosophila

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 1993 Apr 1

PMID 8467806

Citations 34

Authors

C Kappler

M Meister

M Lagueux

E Gateff

J A Hoffmann

J M Reichhart

Affiliations

Soon will be listed here.

Abstract

The Drosophila diptericin gene codes for a 9 kDa antibacterial peptide and is rapidly and transiently expressed in larvae and adults after bacterial challenge. It is also induced in a tumorous Drosophila blood cell line by the addition of lipopolysaccharide (LPS). The promoter of this gene contains two 17 bp repeats located closely upstream of the TATA-box and harbouring a decameric kappa B-related sequence. This study reports that the replacement of the two 17 bp repeats by random sequences abolishes bacteria inducibility in transgenic fly lines. In transfected tumorous blood cells, the replacement of both or either of the 17 bp motifs reduces dramatically LPS inducibility, whereas multiple copies significantly increase the level of transcriptional activation by LPS challenge. A specific DNA-protein binding activity is evidenced in cytoplasmic and nuclear extracts of induced blood cells and fat body. It is absent in controls. It is proposed that induction of the diptericin gene mediated by the two 17 bp repeats occurs via a mechanism similar to that of mammalian NF-kappa B.

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