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PMID:11489964

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Citation

Denlinger, LC, Fisette, PL, Sommer, JA, Watters, JJ, Prabhu, U, Dubyak, GR, Proctor, RA and Bertics, PJ (2001) Cutting edge: the nucleotide receptor P2X7 contains multiple protein- and lipid-interaction motifs including a potential binding site for bacterial lipopolysaccharide. J. Immunol. 167:1871-6

Abstract

The nucleotide receptor P2X7 has been shown to modulate LPS-induced macrophage production of numerous inflammatory mediators. Although the C-terminal portion of P2X7 is thought to be essential for multiple receptor functions, little is known regarding the structural motifs that lie within this region. We show here that the P2X7 C-terminal domain contains several apparent protein-protein and protein-lipid interaction motifs with potential importance to macrophage signaling and LPS action. Surprisingly, P2X7 also contains a conserved LPS-binding domain. In this report, we demonstrate that peptides derived from this P2X7 sequence bind LPS in vitro. Moreover, these peptides neutralize the ability of LPS to activate the extracellular signal-regulated kinases (ERK1, ERK2) and to promote the degradation of the inhibitor of kappaB-alpha isoform (IkappaB-alpha) in RAW 264.7 macrophages. Collectively, these data suggest that the C-terminal domain of P2X7 may directly coordinate several signal transduction events related to macrophage function and LPS action.

Links

PubMed

Keywords

Acute-Phase Proteins; Adhesins, Bacterial/metabolism; Amino Acid Motifs; Amino Acid Sequence; Animals; Antigens, CD/metabolism; Binding Sites/immunology; Carrier Proteins/metabolism; Cells, Cultured; Conserved Sequence; Cytoskeletal Proteins/metabolism; Humans; Lipid Metabolism; Lipopolysaccharides/metabolism; Membrane Glycoproteins; Mice; Molecular Sequence Data; Protein Structure, Tertiary; Receptors, Purinergic P2/chemistry; Receptors, Purinergic P2/metabolism; Receptors, Purinergic P2X7; Receptors, Tumor Necrosis Factor/metabolism; Receptors, Tumor Necrosis Factor, Type I; src Homology Domains

Significance

Annotations

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

MOUSE:P2RX7

acts_upstream_of_or_within

GO:0030163: protein catabolic process

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

MOUSE:P2RX7

enables

GO:0001530: lipopolysaccharide binding

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

MOUSE:P2RX7

acts_upstream_of_or_within

GO:0043409: negative regulation of MAPK cascade

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

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