Neuron. 2006 Nov 9;52(3):485-96.

The TRPM7 ion channel functions in cholinergic synaptic vesicles and affects transmitter release.External

Krapivinsky, G., Mochida, S., Krapivinsky, L., Cibulsky, S. M., Clapham, D. E.,
["Howard Hughes Medical Institute, Cardiology, Children's Hospital Boston, 1309 Enders Building, 320 Longwood Avenue, Boston, MA, USA."]
A longstanding hypothesis is that ion channels are present in the membranes of synaptic vesicles and might affect neurotransmitter release. Here we demonstrate that TRPM7, a member of the transient receptor potential (TRP) ion channel family, resides in the membrane of synaptic vesicles of sympathetic neurons, forms molecular complexes with the synaptic vesicle proteins synapsin I and synaptotagmin I, and directly interacts with synaptic vesicular snapin. In sympathetic neurons, changes in TRPM7 levels and channel activity alter acetylcholine release, as measured by EPSP amplitudes and decay times in postsynaptic neurons. TRPM7 affects EPSP quantal size, an intrinsic property of synaptic vesicle release. Targeted peptide interference of TRPM7's interaction with snapin affects the amplitudes and kinetics of postsynaptic EPSPs. Thus, vesicular TRPM7 channel activity is critical to neurotransmitter release in sympathetic neurons.
PMID: 17088214External
Arrow2 Screening Arrow2 Validation: In vitro validation Arrow2 Validation: In vivo validation Arrow2 Characterization Arrow2 Functional consequence Arrow2 top
Screening Toggle
  Experimental screening Non-experimental screening Reference
TRP channel construct Interactor source
TRP channel Interactor Method Species Region Species Organ/tissue Sample type
TRPM7 Link SNAPIN Yeast two-hybrid Human 87-326 Human Brain cDNA library 17088214
TRPM7 Link Synapsin1 Inference Prediction 17088214
TRPM7 Link Synaptotagmin 1 Inference Prediction 17088214
(Link: click the arrow icon to show interactions only between the corresponding TRP channel and the interactor)
Arrow2 Screening Arrow2 Validation: In vitro validation Arrow2 Validation: In vivo validation Arrow2 Characterization Arrow2 Functional consequence Arrow2 top
Validation: In vitro validation Toggle
  Assay with recombinant proteins Reference
TRP channel construct Interactor construct
TRP channel Interactor Method Species Region Expression system Species Region Expression system
TRPM7 Link SNAPIN Fusion protein-pull down assay Human 83-326 In vitro translation Human Full-length Not specified 17088214
(Link: click the arrow icon to show interactions only between the corresponding TRP channel and the interactor)
Arrow2 Screening Arrow2 Validation: In vitro validation Arrow2 Validation: In vivo validation Arrow2 Characterization Arrow2 Functional consequence Arrow2 top
Validation: In vivo validation Toggle
  Assay with endogenous proteins Assay with overexpressed proteins Reference
Cell or tissue Cell or tissue TRP channel construct Interactor construct
TRP channel Interactor Method Species Region Species Region
TRPM7 Link SNAPIN Co-immunoprecipitation Rat brain synaptic vesicle 17088214
TRPM7 Link Synapsin1 Co-immunoprecipitation Rat brain synaptic vesicle 17088214
TRPM7 Link Synapsin1 Co-immunofluorescence staining Rat SCG sympathetic neuron 17088214
TRPM7 Link Synaptotagmin 1 Co-immunoprecipitation Rat brain synaptic vesicle 17088214
(Link: click the arrow icon to show interactions only between the corresponding TRP channel and the interactor)
Arrow2 Screening Arrow2 Validation: In vitro validation Arrow2 Validation: In vivo validation Arrow2 Characterization Arrow2 Functional consequence Arrow2 top
Characterization Toggle
  Binding region mapping Stoichiometry Affinity (Kd) Reference
TRP channel Interactor
TRP channel Interactor Method Species Region Species Region
TRPM7 Link SNAPIN Fusion protein-pull down assay Human 87-326 Human 43-68 17088214
(Link: click the arrow icon to show interactions only between the corresponding TRP channel and the interactor)
TRP / Interactor

To prevent spam comments, we use reCAPTCHA. Please type correct words into the following box.