C-terminal half of gelsolin soaked in low calcium at pH 4.5

Experimental Data Snapshot

  • Resolution: 1.55 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 

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This is version 1.4 of the entry. See complete history


Calcium ion exchange in crystalline gelsolin

Chumnarnsilpa, S.Loonchanta, A.Xue, B.Choe, H.Urosev, D.Wang, H.Lindberg, U.Burtnick, L.D.Robinson, R.C.

(2006) J Mol Biol 357: 773-782

  • DOI: https://doi.org/10.1016/j.jmb.2006.01.026
  • Primary Citation of Related Structures:  
    2FH1, 2FH2, 2FH3, 2FH4

  • PubMed Abstract: 

    Gelsolin is a calcium and pH-sensitive modulator of actin filament length. Here, we use X-ray crystallography to examine the extraction and exchange of calcium ions from their binding sites in different crystalline forms of the activated N and C-terminal halves of gelsolin, G1-G3 and G4-G6, respectively. We demonstrate that the combination of calcium and low pH activating conditions do not induce conformational changes in G4-G6 beyond those elicited by calcium alone. EGTA is able to remove calcium ions bound to the type I and type II metal ion-binding sites in G4-G6. Constrained by crystal contacts and stabilized by interdomain interaction surfaces, the gross structure of calcium-depleted G4-G6 remains that of the activated form. However, high-resolution details of changes in the ion-binding sites may represent the initial steps toward restoration of the arrangement of domains found in the calcium-free inactive form of gelsolin in solution. Furthermore, bathing crystals with the trivalent calcium ion mimic, Tb3+, results in anomalous scattering data that permit unequivocal localization of terbium ions in each of the proposed type I and type II ion-binding sites of both halves of gelsolin. In contrast to predictions based on solution studies, we find that no calcium ion is immune to exchange.

  • Organizational Affiliation

    Department of Medical Biochemistry and Microbiology, Uppsala Biomedical Center, Uppsala University, Uppsala 751 23, Sweden.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C
344Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P06396 (Homo sapiens)
Explore P06396 
Go to UniProtKB:  P06396
GTEx:  ENSG00000148180 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06396
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.55 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.822α = 90
b = 90.32β = 90
c = 156.299γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-06-13
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-05-23
    Changes: Data collection
  • Version 1.4: 2024-03-13
    Changes: Data collection, Database references, Derived calculations