6MG9

Human Obscurin Ig57 Domain


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Obscurin is a semi-flexible molecule in solution.

Whitley, J.A.Ex-Willey, A.M.Marzolf, D.R.Ackermann, M.A.Tongen, A.L.Kokhan, O.Wright, N.T.

(2019) Protein Sci 28: 717-726

  • DOI: https://doi.org/10.1002/pro.3578
  • Primary Citation of Related Structures:  
    6MG9

  • PubMed Abstract: 

    Obscurin, a giant modular cytoskeletal protein, is comprised mostly of tandem immunoglobulin-like (Ig-like) domains. This architecture allows obscurin to connect distal targets within the cell. The linkers connecting the Ig domains are usually short (3-4 residues). The physical effect arising from these short linkers is not known; such linkers may lead to a stiff elongated molecule or, conversely, may lead to a more compact and dynamic structure. In an effort to better understand how linkers affect obscurin flexibility, and to better understand the physical underpinnings of this flexibility, here we study the structure and dynamics of four representative sets of dual obscurin Ig domains using experimental and computational techniques. We find in all cases tested that tandem obscurin Ig domains interact at the poles of each domain and tend to stay relatively extended in solution. NMR, SAXS, and MD simulations reveal that while tandem domains are elongated, they also bend and flex significantly. By applying this behavior to a simplified model, it becomes apparent obscurin can link targets more than 200 nm away. However, as targets get further apart, obscurin begins acting as a spring and requires progressively more energy to further elongate.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, James Madison University, Harrisonburg, Virginia, 22807.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Obscurin102Homo sapiensMutation(s): 0 
Gene Names: OBSCNKIAA1556KIAA1639
EC: 2.7.11.1
UniProt & NIH Common Fund Data Resources
Find proteins for Q5VST9 (Homo sapiens)
Explore Q5VST9 
Go to UniProtKB:  Q5VST9
GTEx:  ENSG00000154358 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5VST9
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United StatesCHE-1757874
National Science Foundation (NSF, United States)United StatesMCB-160724

Revision History  (Full details and data files)

  • Version 1.0: 2019-02-06
    Type: Initial release
  • Version 1.1: 2019-08-21
    Changes: Data collection, Database references
  • Version 1.2: 2019-11-27
    Changes: Author supporting evidence, Data collection
  • Version 1.3: 2024-05-01
    Changes: Data collection, Database references