Trypsin cleaves acid-sensing ion channel 1a in a domain that is critical for channel gating.

Details

Serval ID
serval:BIB_C47FED41FAAE
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Trypsin cleaves acid-sensing ion channel 1a in a domain that is critical for channel gating.
Journal
Journal of Biological Chemistry
Author(s)
Vukicevic M., Weder G., Boillat A., Boesch A., Kellenberger S.
ISSN
0021-9258[print], 0021-9258[linking]
Publication state
Published
Issued date
2006
Volume
281
Number
2
Pages
714-722
Language
english
Abstract
Acid-sensing ion channels (ASICs) are neuronal Na(+) channels that are members of the epithelial Na(+) channel/degenerin family and are transiently activated by extracellular acidification. ASICs in the central nervous system have a modulatory role in synaptic transmission and are involved in cell injury induced by acidosis. We have recently demonstrated that ASIC function is regulated by serine proteases. We provide here evidence that this regulation of ASIC function is tightly linked to channel cleavage. Trypsin cleaves ASIC1a with a similar time course as it changes ASIC1a function, whereas ASIC1b, whose function is not modified by trypsin, is not cleaved. Trypsin cleaves ASIC1a at Arg-145, in the N-terminal part of the extracellular loop, between a highly conserved sequence and a sequence that is critical for ASIC1a inhibition by the venom of the tarantula Psalmopoeus cambridgei. This channel domain controls the inactivation kinetics and co-determines the pH dependence of ASIC gating. It undergoes a conformational change during inactivation, which renders the cleavage site inaccessible to trypsin in inactivated channels.
Keywords
Amino Acid Sequence, Animals, Arginine/chemistry, Hydrogen-Ion Concentration, Membrane Proteins/chemistry, Membrane Proteins/metabolism, Mice, Molecular Sequence Data, Mutagenesis, Site-Directed, Nerve Tissue Proteins/chemistry, Nerve Tissue Proteins/metabolism, Oocytes/metabolism, Protein Structure, Tertiary, Recombinant Fusion Proteins/chemistry, Sodium Channels/chemistry, Sodium Channels/metabolism, Spider Venoms, Trypsin/chemistry, Trypsin/pharmacology, Xenopus/metabolism, Xenopus laevis
Pubmed
Web of science
Create date
24/01/2008 12:45
Last modification date
20/08/2019 15:39
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