Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 81.60 kDa 
• Atom Count: 5541 
• Residue Count: 695 
• Unique protein chains: 2

1RGI

Crystal structure of gelsolin domains G1-G3 bound to actin

• DOI: 10.2210/pdb1RGI/pdb

• Classification: CONTRACTILE PROTEIN
• Organism(s): Equus caballus, Oryctolagus cuniculus
• Mutation(s): No 


• Deposited: 2003-11-12 Released: 2004-07-27 
• Deposition Author(s): Burtnick, L.D., Urosev, D., Irobi, E., Narayan, K., Robinson, R.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.258 
• R-Value Work: 0.224 
• R-Value Observed: 0.226 

Literature

Structure of the N-terminal half of gelsolin bound to actin: roles in severing, apoptosis and FAF

Burtnick, L.D., Urosev, D., Irobi, E., Narayan, K., Robinson, R.C.

(2004) EMBO J 23: 2713-2722

• PubMed: 15215896 
• DOI: 10.1038/sj.emboj.7600280
• Primary Citation of Related Structures:  
  1RGI


• PubMed Abstract: 
  

The actin filament-severing functionality of gelsolin resides in its N-terminal three domains (G1-G3). We have determined the structure of this fragment in complex with an actin monomer. The structure reveals the dramatic domain rearrangements that activate G1-G3, which include the replacement of interdomain interactions observed in the inactive, calcium-free protein by new contacts to actin, and by a novel G2-G3 interface. Together, these conformational changes are critical for actin filament severing, and we suggest that their absence leads to the disease Finnish-type familial amyloidosis. Furthermore, we propose that association with actin drives the calcium-independent activation of isolated G1-G3 during apoptosis, and that a similar mechanism operates to activate native gelsolin at micromolar levels of calcium. This is the first structure of a filament-binding protein bound to actin and it sets stringent, high-resolution limitations on the arrangement of actin protomers within the filament.

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Organizational Affiliation: 

Department of Chemistry and Centre for Blood Research, The University of British Columbia, Vancouver, BC, Canada.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Gelsolin	G	346	Equus caballus	Mutation(s): 0  Gene Names: GSN
Find proteins for Q28372 (Equus caballus) Explore Q28372  Go to UniProtKB:  Q28372

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Actin, alpha skeletal muscle	A	377	Oryctolagus cuniculus	Mutation(s): 0  Gene Names: ACTA1, ACTA
Find proteins for P68135 (Oryctolagus cuniculus) Explore P68135  Go to UniProtKB:  P68135

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ATP	A	ADENOSINE-5'-TRIPHOSPHATE C10 H16 N5 O13 P3 ZKHQWZAMYRWXGA-KQYNXXCUSA-N
CA	A, G	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.258 
• R-Value Work: 0.224 
• R-Value Observed: 0.226 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 145.245	α = 90
b = 145.245	β = 90
c = 129.948	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
SCALEPACK	data scaling
AMoRE	phasing
CNS	refinement
DENZO	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-11-12 
• Released Date: 2004-07-27 
Deposition Author(s): Burtnick, L.D., Urosev, D., Irobi, E., Narayan, K., Robinson, R.C.

Revision History 

• Version 1.0: 2004-07-27
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Advisory, Version format compliance
• Version 1.3: 2019-07-24
  Changes: Data collection, Refinement description