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2015 ; 37
(11
): 1184-92
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gab.com Text
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How the TRPA1 receptor transmits painful stimuli: Inner workings revealed by
electron cryomicroscopy
#MMPMID26387779
Brewster MS
; Gaudet R
Bioessays
2015[Nov]; 37
(11
): 1184-92
PMID26387779
show ga
A new high-resolution structure of a pain-sensing ion channel, TRPA1, provides a
molecular scaffold to understand channel function. Unexpected structural features
include a TRP-domain helix similar to TRPV1, a novel ligand-binding site, and an
unusual C-terminal coiled coil stabilized by inositol hexakisphosphate (IP6).
TRP-domain helices, which structurally act as a nexus for communication between
the channel gates and its other domains, may thus be a feature conserved across
the entire TRP family and, possibly, other allosterically-gated channels.
Similarly, the TRPA1 antagonist-binding site could also represent a druggable
location in other ion channels. Combined with known TRPA1 functional properties,
the structural role for IP6 leads us to propose that polyphosphate unbinding
could act as a molecular kill switch for TRPA1 inactivation. Finally, although
packing of the TRPA1 membrane-proximal region hints at a mechanism for
electrophile sensing, the details of how TRPA1 responds to noxious reactive
electrophiles and temperature await future studies.