Title: Substitution of conserved glycine residue by alanine in natural and synthetic neuropeptide ligands causes partial agonism at the stomoxytachykinin receptor
Authors: Poels, Jeroen ×
Van Loy, Tom
Franssens, Vanessa
Detheux, M
Nachman, RJ
Oonk, HB
Akerman, KE
Vassart, G
Parmentier, M
De Loof, Arnold
Torfs, Herbert
Vanden Broeck, Jozef #
Issue Date: Jul-2004
Publisher: Blackwell publishing ltd
Series Title: Journal of Neurochemistry vol:90 issue:2 pages:472-478
Abstract: A few naturally occurring insect tachykinin-related peptides, such as stomoxytachykinin (Stc-TK), contain an Ala-residue instead of the highly conserved Gly-residue that is present in most other members of this peptide family. Stc-TK is a potent, partial agonist of the stable fly (Stomoxys calcitrans) tachykinin receptor, STKR. By means of synthetic analogues, the Gly/Ala exchange, representing the addition of a single methyl group in the active core region of these peptides, was shown to be fully responsible for the generation of this partial agonism, which was also accompanied by an increase in agonistic potency. Surprisingly, this Ala-dependent reduction in maximal response levels was only observed for the agonist-induced cellular calcium rise. Stomoxytachykinin, Stc-TK, did not display partial agonism for the STKR-mediated cyclic AMP response. A possible explanation for this differential partial agonism is that the Gly-containing and Ala-replaced peptides recognize and stabilize active receptor conformations that differ in their functional coupling efficacies towards these response pathways. Drosotachykinins, Drm-TK, tachykinin-like peptides encoded in the fruit fly genome, were shown to be STKR-agonists. Interestingly, one of these peptides, which contains an Ala-residue instead of the conserved Gly-residue, also proved to be a potent, partial agonist for STKR.
ISSN: 0022-3042
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Animal Physiology and Neurobiology Section - miscellaneous
Department of Biology - miscellaneous
Molecular Physiology of Plants and Micro-organisms Section - miscellaneous
× corresponding author
# (joint) last author

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