Abstract
TNF-alpha converting enzyme (TACE) is the protease responsible for processing proTNF from the 26-kDa membrane-anchored precursor to the secreted 17-kDa TNF-alpha. We show here that a deletion mutant of TACE (dTACE), lacking the pro and catalytic domains of the protease, acts as a dominant negative for proTNF processing in transfected HEK293 cells. We used the same system to test the effect of dTACE on TNFRII processing. Overexpression of dTACE with TNFRII resulted in >80% inhibition of TNFRII shedding. Although significant inhibition of TNF-alpha and TNFRII shedding was achieved with dTACE, we could not detect a cell surface accumulation of the noncleaved substrates above that observed in the absence of dTACE. Our results suggest that TNFRII is a substrate for TACE, and that dTACE is capable of interfering with the function of endogenous TACE, either by binding and sequestering TACE substrates via the disintegrin domain, transmembrane domain, or cytoplasmic tail, or by some other mechanism that has yet to be determined.
MeSH terms
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ADAM Proteins
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ADAM10 Protein
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ADAM17 Protein
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Amyloid Precursor Protein Secretases
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Antigens, CD / biosynthesis
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Antigens, CD / genetics
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Antigens, CD / metabolism*
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Cell Line
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Cytoplasm / metabolism
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Cytoplasm / physiology
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DNA, Complementary / genetics
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Disintegrins / genetics
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Disintegrins / physiology
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Enzyme Activation / genetics
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Flow Cytometry
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Humans
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Membrane Proteins / antagonists & inhibitors
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Membrane Proteins / biosynthesis
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Metalloendopeptidases / antagonists & inhibitors
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Metalloendopeptidases / biosynthesis
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Metalloendopeptidases / chemistry
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Metalloendopeptidases / genetics*
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Metalloendopeptidases / physiology*
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Peptide Fragments / genetics
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Peptide Fragments / physiology
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Protein Precursors / antagonists & inhibitors*
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Protein Precursors / biosynthesis
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Protein Precursors / genetics
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Protein Precursors / metabolism*
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Protein Processing, Post-Translational / genetics
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Protein Processing, Post-Translational / immunology
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Receptors, Tumor Necrosis Factor / biosynthesis
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Receptors, Tumor Necrosis Factor / genetics
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Receptors, Tumor Necrosis Factor / metabolism*
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Receptors, Tumor Necrosis Factor, Type II
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Solubility
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Substrate Specificity / genetics
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Transfection
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Tumor Necrosis Factor-alpha / antagonists & inhibitors*
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Tumor Necrosis Factor-alpha / biosynthesis
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Tumor Necrosis Factor-alpha / genetics
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Tumor Necrosis Factor-alpha / metabolism*
Substances
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Antigens, CD
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DNA, Complementary
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Disintegrins
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Membrane Proteins
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Peptide Fragments
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Protein Precursors
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Receptors, Tumor Necrosis Factor
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Receptors, Tumor Necrosis Factor, Type II
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Tumor Necrosis Factor-alpha
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tumor necrosis factor precursor
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Amyloid Precursor Protein Secretases
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ADAM Proteins
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Metalloendopeptidases
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ADAM10 Protein
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ADAM10 protein, human
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ADAM17 Protein
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ADAM17 protein, human