4Z8G

Chimera of Tropomodulin-1 and Leiomodin-1 Actin-Binding Site 2 (TL1 ABS2)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.194 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

How Leiomodin and Tropomodulin use a common fold for different actin assembly functions.

Boczkowska, M.Rebowski, G.Kremneva, E.Lappalainen, P.Dominguez, R.

(2015) Nat Commun 6: 8314-8314

  • DOI: https://doi.org/10.1038/ncomms9314
  • Primary Citation of Related Structures:  
    4Z79, 4Z8G, 4Z94

  • PubMed Abstract: 

    How proteins sharing a common fold have evolved different functions is a fundamental question in biology. Tropomodulins (Tmods) are prototypical actin filament pointed-end-capping proteins, whereas their homologues, Leiomodins (Lmods), are powerful filament nucleators. We show that Tmods and Lmods do not compete biochemically, and display similar but distinct localization in sarcomeres. Changes along the polypeptide chains of Tmods and Lmods exquisitely adapt their functions for capping versus nucleation. Tmods have alternating tropomyosin (TM)- and actin-binding sites (TMBS1, ABS1, TMBS2 and ABS2). Lmods additionally contain a C-terminal extension featuring an actin-binding WH2 domain. Unexpectedly, the different activities of Tmods and Lmods do not arise from the Lmod-specific extension. Instead, nucleation by Lmods depends on two major adaptations-the loss of pointed-end-capping elements present in Tmods and the specialization of the highly conserved ABS2 for recruitment of two or more actin subunits. The WH2 domain plays only an auxiliary role in nucleation.


  • Organizational Affiliation

    Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tropomodulin-1, Leiomodin-1 chimera (TP1 ABS2)191Homo sapiensMutation(s): 0 
Gene Names: TMOD1D9S57ETMODLMOD1
UniProt & NIH Common Fund Data Resources
Find proteins for P28289 (Homo sapiens)
Explore P28289 
Go to UniProtKB:  P28289
PHAROS:  P28289
GTEx:  ENSG00000136842 
Find proteins for P29536 (Homo sapiens)
Explore P29536 
Go to UniProtKB:  P29536
PHAROS:  P29536
GTEx:  ENSG00000163431 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP28289P29536
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.194 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.468α = 90
b = 53.936β = 90
c = 75.604γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
SAINTdata reduction
Cootmodel building
PHENIXphasing
SAINTdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01 GM073791

Revision History  (Full details and data files)

  • Version 1.0: 2015-10-21
    Type: Initial release
  • Version 1.1: 2017-09-06
    Changes: Author supporting evidence, Derived calculations
  • Version 1.2: 2018-03-07
    Changes: Data collection
  • Version 1.3: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.4: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description