6DQJ

Human type 3 1,4,5-inositol trisphosphate receptor in a ligand-free state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.49 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural basis for the regulation of inositol trisphosphate receptors by Ca2+and IP3.

Paknejad, N.Hite, R.K.

(2018) Nat Struct Mol Biol 25: 660-668

  • DOI: 10.1038/s41594-018-0089-6
  • Primary Citation of Related Structures:  
    6DRA, 6DRC, 6DQS, 6DQV, 6DQZ, 6DQN, 6DR0, 6DR2, 6DQJ

  • PubMed Abstract: 
  • Inositol trisphosphate receptors (IP 3 Rs) are ubiquitous Ca 2+ -permeable channels that mediate release of Ca 2+ from the endoplasmic reticulum, thereby regulating numerous processes including cell division, cell death, differentiation and fertilization ...

    Inositol trisphosphate receptors (IP 3 Rs) are ubiquitous Ca 2+ -permeable channels that mediate release of Ca 2+ from the endoplasmic reticulum, thereby regulating numerous processes including cell division, cell death, differentiation and fertilization. IP 3 Rs are jointly activated by inositol trisphosphate (IP 3 ) and their permeant ion, Ca 2+ . At high concentrations, however, Ca 2+ inhibits activity, ensuring precise spatiotemporal control over intracellular Ca 2+ . Despite extensive characterization of IP 3 R, the mechanisms through which these molecules control channel gating have remained elusive. Here, we present structures of full-length human type 3 IP 3 Rs in ligand-bound and ligand-free states. Multiple IP 3 -bound structures demonstrate that the large cytoplasmic domain provides a platform for propagation of long-range conformational changes to the ion-conduction gate. Structures in the presence of Ca 2+ reveal two Ca 2+ -binding sites that induce the disruption of numerous interactions between subunits, thereby inhibiting IP 3 R. These structures thus provide a mechanistic basis for beginning to understand the regulation of IP 3 R.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA. hiter@mskcc.org.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Inositol 1,4,5-trisphosphate receptor type 3A, B, C, D2671Homo sapiensMutation(s): 0 
Gene Names: ITPR3
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Calcium Ion-Selective
Protein: 
InsP3R3 Inositol-1,4,5-trisphosphate receptor, apo state
Find proteins for Q14573 (Homo sapiens)
Explore Q14573 
Go to UniProtKB:  Q14573
NIH Common Fund Data Resources
PHAROS:  Q14573
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.49 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-08-01
    Type: Initial release
  • Version 1.1: 2018-08-15
    Changes: Data collection, Database references