6M3R

Crystal structure of AnkG/beta4-spectrin complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.31 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.256 
  • R-Value Observed: 0.258 

wwPDB Validation   3D Report Full Report


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Literature

Structural Basis Underlying Strong Interactions between Ankyrins and Spectrins.

Li, J.Chen, K.Zhu, R.Zhang, M.

(2020) J Mol Biol 

  • DOI: 10.1016/j.jmb.2020.04.023
  • Primary Citation of Related Structures:  
    6M3P, 6M3Q, 6M3R

  • PubMed Abstract: 
  • Ankyrins (encoded by ANK1/2/3 corresponding to Ankyrin-R/B/G or AnkR/B/G), via binding to spectrins, connect plasma membranes with actin cytoskeleton to maintain mechanical strengths and to modulate excitabilities of diverse cells such as neurons, muscle cells, and erythrocytes ...

    Ankyrins (encoded by ANK1/2/3 corresponding to Ankyrin-R/B/G or AnkR/B/G), via binding to spectrins, connect plasma membranes with actin cytoskeleton to maintain mechanical strengths and to modulate excitabilities of diverse cells such as neurons, muscle cells, and erythrocytes. Cellular and genetic evidences suggest that each isoform of ankyrins pairs with a specific β-spectrin in discrete subcellular membrane microdomains for distinct functions, although the molecular mechanisms underlying such ankyrin/β-spectrin pairings are unknown. In this study, we discover that a conserved and short extension N-terminal to the ZU5 N -ZU5 C -UPA tandem (exZZU) is critical for each ankyrin to bind to β-spectrins with high affinities. Structures of AnkB/G exZZU in complex with spectrin repeats13-15 of β2/β4-spectrins solved here reveal that the extension sequence of exZZU forms an additional β-strand contributing to the structural stability and enhanced affinity of each ZU5 N /spectrin repeat interaction. The complex structures further reveal that the UPA domain of exZZU directly participates in spectrin binding. Formation of the exZZU supramodule juxtaposes the ZU5 N and UPA domains for simultaneous interacting with spectrin repeats 14 and 15. However, our biochemical and structural investigations indicate that the direct and strong interactions between ankyrins and β-spectrins do not appear to determine their pairing specificities. Therefore, there likely exists additional mechanism(s) for modulating functional pairings between ankyrins and β-spectrins in cells.


    Organizational Affiliation

    Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China; Greater Bay Biomedical Innocenter, Shenzhen Bay Laboratory, Shenzhen 518055, China; Center of Systems Biology and Human Health, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China. Electronic address: mzhang@ust.hk.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ankyrin-3A [auth E]491Rattus norvegicusMutation(s): 0 
Gene Names: Ank3
UniProt
Find proteins for O70511 (Rattus norvegicus)
Explore O70511 
Go to UniProtKB:  O70511
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Spectrin beta chainB [auth F]322Mus musculusMutation(s): 0 
Gene Names: Sptbn4Spnb4
UniProt
Find proteins for E9PX29 (Mus musculus)
Explore E9PX29 
Go to UniProtKB:  E9PX29
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.31 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.256 
  • R-Value Observed: 0.258 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 139.591α = 90
b = 139.591β = 90
c = 211.317γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
The University Grants Committee, Research Grants Council (RGC)Hong Kong16100517

Revision History  (Full details and data files)

  • Version 1.0: 2020-05-13
    Type: Initial release