Abstract：
:Gain-of-function (GOF) mutations in ion channels are rare events, which lead to increased agonist sensitivity or altered gating properties, and may render the channel constitutively active. Uncovering and following characterization of such mutants contribute substantially to the understanding of the molecular basis of ion channel functioning. Here we give an overview of some GOF mutants in polymodal ion channels specifically involved in transduction of painful stimuli--TRPV1 and TRPA1, which are scrutinized by scientists due to their important role in development of some pathological pain states. Remarkably, a substitution of single amino acid in the S4-S5 region of TRPA1 (N855S) has been recently associated with familial episodic pain syndrome. This mutation increases chemical sensitivity of TRPA1, but leaves the voltage sensitivity unchanged. On the other hand, mutations in the analogous region of TRPV1 (R557K and G563S) severely affect all aspects of channel activation and lead to spontaneous activity. Comparison of the effects induced by mutations in homologous positions in different TRP receptors (or more generally in other distantly related ion channels) may elucidate the gating mechanisms conserved during evolution.
journal_name
Physiol Resjournal_title
Physiological researchauthors
Boukalova S,Touska F,Marsakova L,Hynkova A,Sura L,Chvojka S,Dittert I,Vlachova Vdoi
10.33549/physiolres.932658subject
Has Abstractpub_date
2014-01-01 00:00:00pages
S205-13issue
Suppl 1eissn
0862-8408issn
1802-9973pii
932658journal_volume
63pub_type
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