RRC ID 1787
Author Kambris Z, Brun S, Jang IH, Nam HJ, Romeo Y, Takahashi K, Lee WJ, Ueda R, Lemaitre B.
Title Drosophila immunity: a large-scale in vivo RNAi screen identifies five serine proteases required for Toll activation.
Journal Curr. Biol.
Abstract Unlike mammalian Toll-like Receptors, the Drosophila Toll receptor does not interact directly with microbial determinants but is rather activated upon binding a cleaved form of the cytokine-like molecule Spatzle (Spz). During the immune response, Spz is thought to be processed by secreted serine proteases (SPs) present in the hemolymph that are activated by the recognition of gram-positive bacteria or fungi . In the present study, we have used an in vivo RNAi strategy to inactivate 75 distinct Drosophila SP genes. We then screened this collection for SPs regulating the activation of the Toll pathway by gram-positive bacteria. Here, we report the identification of five novel SPs that function in an extracellular pathway linking the recognition proteins GNBP1 and PGRP-SA to Spz. Interestingly, four of these genes are also required for Toll activation by fungi, while one is specifically associated with signaling in response to gram-positive bacterial infections. These results demonstrate the existence of a common cascade of SPs upstream of Spz, integrating signals sent by various secreted recognition molecules via more specialized SPs.
Volume 16(8)
Pages 808-13
Published 2006-4-18
DOI 10.1016/j.cub.2006.03.020
PII S0960-9822(06)01276-0
PMID 16631589
MeSH Animals Carrier Proteins / metabolism Drosophila / immunology* Drosophila Proteins / metabolism* Enterococcus faecalis Gram-Positive Bacterial Infections / immunology Micrococcus luteus RNA Interference Serine Endopeptidases / genetics Serine Endopeptidases / physiology* Toll-Like Receptors / metabolism*
IF 9.193
Times Cited 146
Drosophila 3066R-1 3066R-3 16705R-1 16705R-2 9649R-1 9649R-3 11842R-1 11842R-2 11841R-1 11841R-4 9631R-2 9631R-3 6467R-1 6467R-2 5909R-2 5909R-3 9645R-1 9645R-3 2045R-2 2045R-3 2056R-2 2056R-3 8867R-1 8867R-2 18180R-2 18179R-1 18179R-2 9672R-1 9672R-2 8871R-1 8871R-2 10475R-1 16997R-1 16997R-3 6457R-1 6457R-2 8952R-1 8952R-3 17837R-1 17837R-2 10764R-1 10764R-2 10472R-1 10472R-2 6483R-1 6483R-2 11836R-1 11836R-2 5896R-1 5896R-2 14642R-1 14642R-2 9564R-1 9564R-2 7542R-1 7542R-2 4914R-1 4914R-2 10663R-2 10663R-3 8329R-1 8329R-3 17012R-3 10882R-1 10882R-6 11911R-1 11911R-2 11912R-2 11912R-3 16998R-2 16998R-3 3229R-1 3229R-2 4316R-1 7142R-2 7142R-4 5390R-1 16996R-1 16996R-3 4998R-1 4998R-2 7170R-2 7170R-3 3117R-1 3117R-3 18557R-1 18557R-2 14990R-1 14990R-2 9675R-2 9675R-3 11066R-1 11066R-2 4650R-1 4650R-3 4793R-1 4793R-2 9997R-3 6048R-1 6048R-3 2229R-1 2229R-3 9673R-1 9673R-3 9737R-1 9737R-2 11664R-2 11664R-3 11843R-1 11843R-2 9676R-1 9676R-3 10587R-1 10587R-2 7996R-2 7996R-3 12951R-1 12951R-2 12558R-1 12558R-4 18478R-1 18478R-2 31034R-1 31034R-4 4821R-1 4821R-3