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PMID:9321392

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Citation

Williams, MJ, Rodriguez, A, Kimbrell, DA and Eldon, ED (1997) The 18-wheeler mutation reveals complex antibacterial gene regulation in Drosophila host defense. EMBO J. 16:6120-30

Abstract

Mammals and insects employ similar Rel/NF-kappaB signaling cascades in their humoral immune responses. The mammalian interleukin-1 type I receptor (IL-1R) is one way of activating this cascade. The Drosophila Toll protein, whose cytoplasmic domain shows striking similarity to that of the IL-1R, acts in the humoral antimicrobial response. Here we demonstrate that a second IL-1R-related Drosophila protein, 18-Wheeler (18W), is a critical component of the humoral immune response. 18-wheeler is expressed in the larval fat body, the primary organ of antimicrobial peptide synthesis. In the absence of the 18W receptor, larvae are more susceptible to bacterial infection. Nuclear translocation of the Rel protein Dorsal-like immunity factor (Dif) is inhibited, though nuclear translocation of another Rel protein, Dorsal, is unaffected. Induction of several antibacterial genes is reduced following infection, relative to wild-type: attacin is reduced by 95%, cecropin by 65% and diptericin by 12%. Finally, 18-wheeler (18w) expression is induced in response to infection and, in addition to the receptor form, four immune-specific transcripts and proteins are produced.

Links

PubMed PMC1326296 Online version:10.1093/emboj/16.20.6120

Keywords

Animals; Anti-Infective Agents/metabolism; Antimicrobial Cationic Peptides; Cell Adhesion Molecules/genetics; DNA-Binding Proteins/metabolism; Drosophila/immunology; Drosophila Proteins; Fat Body/metabolism; Gene Expression Regulation; Insect Proteins/biosynthesis; Insect Proteins/genetics; Larva; Membrane Proteins/genetics; Models, Genetic; Mutation; Nuclear Proteins; Peptides/metabolism; Phosphoproteins; Proto-Oncogene Proteins; RNA, Messenger/biosynthesis; Receptors, Immunologic/genetics; Receptors, Interleukin-1; Transcription Factor RelB; Transcription Factors

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

DROME:A1ZBR2

involved_in

GO:0019731: antibacterial humoral response

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

DROME:A1ZBR2

involved_in

GO:0006955: immune response

ECO:0000270: expression pattern evidence used in manual assertion

P

Seeded From UniProt

complete

DROME:A1ZBR2

located_in

GO:0005886: plasma membrane

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

DROME:Q24591

involved_in

GO:0019731: antibacterial humoral response

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

DROME:Q24591

involved_in

GO:0006955: immune response

ECO:0000270: expression pattern evidence used in manual assertion

P

Seeded From UniProt

complete

DROME:Q24591

located_in

GO:0005886: plasma membrane

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

DROME:Q2XXS4

involved_in

GO:0019731: antibacterial humoral response

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

DROME:Q2XXS4

involved_in

GO:0006955: immune response

ECO:0000270: expression pattern evidence used in manual assertion

P

Seeded From UniProt

complete

DROME:Q2XXS4

located_in

GO:0005886: plasma membrane

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

DROME:Q7JPR9

involved_in

GO:0019731: antibacterial humoral response

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

DROME:Q7JPR9

involved_in

GO:0006955: immune response

ECO:0000270: expression pattern evidence used in manual assertion

P

Seeded From UniProt

complete

DROME:Q7JPR9

located_in

GO:0005886: plasma membrane

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

DROME:Q961H0

involved_in

GO:0019731: antibacterial humoral response

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

DROME:Q961H0

involved_in

GO:0006955: immune response

ECO:0000270: expression pattern evidence used in manual assertion

P

Seeded From UniProt

complete

DROME:Q961H0

located_in

GO:0005886: plasma membrane

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

See also

References

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