7R68

Human obscurin Ig12


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

The N-terminus of obscurin is flexible in solution.

Mauriello, G.E.Moncure, G.E.Nowzari, R.A.Miller, C.J.Wright, N.T.

(2023) Proteins 91: 485-496

  • DOI: https://doi.org/10.1002/prot.26442
  • Primary Citation of Related Structures:  
    7R67, 7R68

  • PubMed Abstract: 

    The N-terminal half of the giant cytoskeletal protein obscurin is comprised of more than 50 Ig-like domains, arranged in tandem. Domains 18-51 are connected to each other through short 5-residue linkers, and this arrangement has been previously shown to form a semi-flexible rod in solution. Domains 1-18 generally have slightly longer ~7 residue interdomain linkers, and the multidomain structure and motion conferred by this kind of linker is understudied. Here, we use NMR, SAXS, and MD to show that these longer linkers are associated with significantly more domain/domain flexibility, with the resulting multidomain structure being moderately compact. Further examination of the relationship between interdomain flexibility and linker length shows there is a 5 residue "sweet spot" linker length that results in dual-domain systems being extended, and conversely that both longer or shorter linkers result in a less extended structure. This detailed knowledge of the obscurin N terminus structure and flexibility allowed for mathematical modeling of domains 1-18, which suggests that this region likely forms tangles if left alone in solution. Given how infrequently protein tangles occur in nature, and given the pathological outcomes that occur when tangles do arise, our data suggest that obscurin is likely either significantly scaffolded or else externally extended in the cell.


  • Organizational Affiliation

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


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Obscurin101Homo 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
PHAROS:  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 StatesMCB-1607024

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-02
    Type: Initial release
  • Version 1.1: 2022-11-09
    Changes: Database references
  • Version 1.2: 2023-03-22
    Changes: Database references
  • Version 1.3: 2024-05-15
    Changes: Data collection, Database references