7CFT

Cryo-EM strucutre of human acid-sensing ion channel 1a in complex with snake toxin Mambalgin1 at pH 8.0


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Structural insights into human acid-sensing ion channel 1a inhibition by snake toxin mambalgin1.

Sun, D.Liu, S.Li, S.Zhang, M.Yang, F.Wen, M.Shi, P.Wang, T.Pan, M.Chang, S.Zhang, X.Zhang, L.Tian, C.Liu, L.

(2020) Elife 9

  • DOI: 10.7554/eLife.57096
  • Primary Citation of Related Structures:  
    7CFT, 7CFS

  • PubMed Abstract: 
  • Acid-sensing ion channels (ASICs) are proton-gated cation channels that are involved in diverse neuronal processes including pain sensing. The peptide toxin Mambalgin1 (Mamba1) from black mamba snake venom can reversibly inhibit the conductance of ASICs, causing an analgesic effect ...

    Acid-sensing ion channels (ASICs) are proton-gated cation channels that are involved in diverse neuronal processes including pain sensing. The peptide toxin Mambalgin1 (Mamba1) from black mamba snake venom can reversibly inhibit the conductance of ASICs, causing an analgesic effect. However, the detailed mechanism by which Mamba1 inhibits ASIC1s, especially how Mamba1 binding to the extracellular domain affects the conformational changes of the transmembrane domain of ASICs remains elusive. Here, we present single-particle cryo-EM structures of human ASIC1a (hASIC1a) and the hASIC1a-Mamba1 complex at resolutions of 3.56 and 3.90 Å, respectively. The structures revealed the inhibited conformation of hASIC1a upon Mamba1 binding. The combination of the structural and physiological data indicates that Mamba1 preferentially binds hASIC1a in a closed state and reduces the proton sensitivity of the channel, representing a closed-state trapping mechanism.


    Organizational Affiliation

    Tsinghua-Peking Joint Center for Life Sciences, Ministry of Education Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Acid-sensing ion channel 1A, B, C477Homo sapiensMutation(s): 0 
Gene Names: ASIC1ACCN2BNAC2
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P78348 (Homo sapiens)
Explore P78348 
Go to UniProtKB:  P78348
PHAROS:  P78348
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Mambalgin-1D, E, F57Dendroaspis polylepis polylepisMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P0DKR6 (Dendroaspis polylepis polylepis)
Explore P0DKR6 
Go to UniProtKB:  P0DKR6
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31600601
National Natural Science Foundation of China (NSFC)China21778051
National Natural Science Foundation of China (NSFC)China91753205
National Natural Science Foundation of China (NSFC)China21532004
Ministry of Science and Technology (MoST, China)China2017YFA0505200
Ministry of Science and Technology (MoST, China)China2016YFA0400903
Ministry of Science and Technology (MoST, China)China2017YFA0505201
Ministry of Science and Technology (MoST, China)China2017YFA0505403

Revision History  (Full details and data files)

  • Version 1.0: 2020-10-21
    Type: Initial release