6WU7

Human Calcium and Integrin Binding Protein 3 E150Q K151H


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.84 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.163 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

CIB2 and CIB3 are auxiliary subunits of the mechanotransduction channel of hair cells.

Liang, X.Qiu, X.Dionne, G.Cunningham, C.L.Pucak, M.L.Peng, G.Kim, Y.H.Lauer, A.Shapiro, L.Muller, U.

(2021) Neuron 109: 2131-2149.e15

  • DOI: https://doi.org/10.1016/j.neuron.2021.05.007
  • Primary Citation of Related Structures:  
    6WU5, 6WU7, 6WUD

  • PubMed Abstract: 

    CIB2 is a Ca 2+ - and Mg 2+ -binding protein essential for mechanoelectrical transduction (MET) by cochlear hair cells, but not by vestibular hair cells that co-express CIB2 and CIB3. Here, we show that in cochlear hair cells, CIB3 can functionally substitute for CIB2. Using X-ray crystallography, we demonstrate that CIB2 and CIB3 are structurally similar to KChIP proteins, auxiliary subunits of voltage-gated K v 4 channels. CIB2 and CIB3 bind to TMC1/2 through a domain in TMC1/2 flanked by transmembrane domains 2 and 3. The co-crystal structure of the CIB-binding domain in TMC1 with CIB3 reveals that interactions are mediated through a conserved CIB hydrophobic groove, similar to KChIP1 binding of K v 4. Functional studies in mice show that CIB2 regulates TMC1/2 localization and function in hair cells, processes that are affected by deafness-causing CIB2 mutations. We conclude that CIB2 and CIB3 are MET channel auxiliary subunits with striking similarity to K v 4 channel auxiliary subunits.


  • Organizational Affiliation

    The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Calcium and integrin-binding family member 3
A, B
191Homo sapiensMutation(s): 2 
Gene Names: CIB3KIP3
UniProt & NIH Common Fund Data Resources
Find proteins for Q96Q77 (Homo sapiens)
Explore Q96Q77 
Go to UniProtKB:  Q96Q77
GTEx:  ENSG00000141977 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96Q77
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download Ideal Coordinates CCD File 
N [auth B]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
CA (Subject of Investigation/LOI)
Query on CA

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
G [auth B]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth B],
H [auth B],
I [auth B],
J [auth B],
K [auth B],
L [auth B],
M [auth B]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.84 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.163 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.386α = 90
b = 84.386β = 90
c = 125.821γ = 120
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
Cootmodel building

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute on Deafness and Other Communication Disorders (NIH/NIDCD)United States5R01DC016960-03

Revision History  (Full details and data files)

  • Version 1.0: 2021-06-23
    Type: Initial release
  • Version 1.1: 2021-07-14
    Changes: Database references
  • Version 1.2: 2021-07-28
    Changes: Database references
  • Version 1.3: 2023-10-18
    Changes: Data collection, Database references, Refinement description