Human Gelsolin Domain 2 with a Cd2+ bound

Experimental Data Snapshot

  • Resolution: 1.65 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 

Starting Model: experimental
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Loss of a metal-binding site in gelsolin leads to familial amyloidosis-Finnish type.

Kazmirski, S.L.Isaacson, R.L.An, C.Buckle, A.Johnson, C.M.Daggett, V.Fersht, A.R.

(2002) Nat Struct Biol 9: 112-116

  • DOI: https://doi.org/10.1038/nsb745
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Mutations in domain 2 (D2, residues 151-266) of the actin-binding protein gelsolin cause familial amyloidosis-Finnish type (FAF). These mutations, D187N or D187Y, lead to abnormal proteolysis of plasma gelsolin at residues 172-173 and a second hydrolysis at residue 243, resulting in an amyloidogenic fragment. Here we present the structure of human gelsolin D2 at 1.65 A and find that Asp 187 is part of a Cd2+ metal-binding site. Two Ca2+ ions are required for a conformational transition of gelsolin to its active form. Differential scanning calorimetry (DSC) and molecular dynamics (MD) simulations suggest that the Cd2+-binding site in D2 is one of these two Ca2+-binding sites and is essential to the stability of D2. Mutation of Asp 187 to Asn disrupts Ca2+ binding in D2, leading to instabilities upon Ca2+ activation. These instabilities make the domain a target for aberrant proteolysis, thereby enacting the first step in the cascade leading to FAF.

  • Organizational Affiliation

    Cambridge University Chemical Laboratory and Cambridge Centre for Protein Engineering, MRC Centre, Hills Road, Cambridge CB2 2QH, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GELSOLIN104Homo 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: 1.65 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.968α = 90
b = 26.525β = 121.19
c = 50.294γ = 90
Software Package:
Software NamePurpose
MAR345data collection
SCALAdata scaling
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-01-04
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2023-08-16
    Changes: Data collection, Database references, Derived calculations, Refinement description