7S8X

Cryo-EM Structure of dolphin Prestin: Sensor Up (compact) state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: CELL 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The conformational cycle of prestin underlies outer-hair cell electromotility.

Bavi, N.Clark, M.D.Contreras, G.F.Shen, R.Reddy, B.G.Milewski, W.Perozo, E.

(2021) Nature 600: 553-558

  • DOI: https://doi.org/10.1038/s41586-021-04152-4
  • Primary Citation of Related Structures:  
    7S8X, 7S9A, 7S9B, 7S9C, 7S9D, 7S9E

  • PubMed Abstract: 

    The voltage-dependent motor protein prestin (also known as SLC26A5) is responsible for the electromotive behaviour of outer-hair cells and underlies the cochlear amplifier 1 . Knockout or impairment of prestin causes severe hearing loss 2-5 . Despite the key role of prestin in hearing, the mechanism by which mammalian prestin senses voltage and transduces it into cellular-scale movements (electromotility) is poorly understood. Here we determined the structure of dolphin prestin in six distinct states using single-particle cryo-electron microscopy. Our structural and functional data suggest that prestin adopts a unique and complex set of states, tunable by the identity of bound anions (Cl - or SO 4 2- ). Salicylate, a drug that can cause reversible hearing loss, competes for the anion-binding site of prestin, and inhibits its function by immobilizing prestin in a new conformation. Our data suggest that the bound anion together with its coordinating charged residues and helical dipole act as a dynamic voltage sensor. An analysis of all of the anion-dependent conformations reveals how structural rearrangements in the voltage sensor are coupled to conformational transitions at the protein-membrane interface, suggesting a previously undescribed mechanism of area expansion. Visualization of the electromotility cycle of prestin distinguishes the protein from the closely related SLC26 anion transporters, highlighting the basis for evolutionary specialization of the mammalian cochlear amplifier at a high resolution.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, IL, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Prestin
A, B
741Tursiops truncatusMutation(s): 0 
Gene Names: SLC26A5
Membrane Entity: Yes 
UniProt
Find proteins for D7PC76 (Tursiops truncatus)
Explore D7PC76 
Go to UniProtKB:  D7PC76
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD7PC76
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: CELL 
  • Reconstruction Method: SINGLE PARTICLE 

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 StatesR01 DC019833

Revision History  (Full details and data files)

  • Version 1.0: 2021-11-03
    Type: Initial release
  • Version 1.1: 2021-12-15
    Changes: Database references
  • Version 1.2: 2021-12-29
    Changes: Database references
  • Version 1.3: 2024-06-05
    Changes: Data collection