Macromolecule Content

• Total Structure Weight: 18532.53 
• Atom Count: 1296 
• Residue Count: 166 
• Unique protein chains: 1

1Q8G

NMR structure of human Cofilin

• DOI: 10.2210/pdb1Q8G/pdb
• BMRB: 6004

• Classification: STRUCTURAL PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2003-08-21 Released: 2004-07-06 
• Deposition Author(s): Pope, B.J., Zierler-Gould, K.M., Kuhne, R., Weeds, A.G., Ball, L.J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 140 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

The solution structure of human cofilin: rationalizing actin binding and pH sensitivity

Pope, B.J., Zierler-Gould, K.M., Kuhne, R., Weeds, A.G., Ball, L.J.

(2004) J.Biol.Chem. 279: 4840-4848

• PubMed: 14627701 
• DOI: 10.1074/jbc.M310148200
• Primary Citation of Related Structures:  
  1Q8X


• PubMed Abstract: 
  

Human actin-depolymerizing factor (ADF) and cofilin are pH-sensitive, actin-depolymerizing proteins. Although 72% identical in sequence, ADF has a much higher depolymerizing activity than cofilin at pH 8. To understand this, we solved the structure of human cofilin using nuclear magnetic resonance and compared it with human ADF. Important sequence differences between vertebrate ADF/cofilins were correlated with unique structural determinants in the F-actin-binding site to account for differences in biochemical activities of the two proteins. Cofilin has a short beta-strand at the C terminus, not found in ADF, which packs against strands beta3/beta4, changing the environment around Lys96, a residue essential for F-actin binding. A salt bridge involving His133 and Asp98 (Glu98 in ADF) may explain the pH sensitivity of human cofilin and ADF; these two residues are fully conserved in vertebrate ADF/cofilins. Chemical shift perturbations identified residues that (i) differ in their chemical environments between wild type cofilin and mutants S3D, which has greatly reduced G-actin binding, and K96Q, which does not bind F-actin; (ii) are affected when G-actin binds cofilin; and (iii) are affected by pH change from 6 to 8. Many residues affected by G-actin binding also show perturbation in the mutants or in response to pH. Our evidence suggests the involvement of residues 133-138 of strand beta5 in all of the activities examined. Because residues in beta5 are perturbed by mutations that affect both G-actin and F-actin binding, this strand forms a "boundary" or "bridge" between the proposed F- and G-actin-binding sites.

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Organizational Affiliation: 

Medical Research Council Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, United Kingdom.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Cofilin, non-muscle isoform	A	166	Homo sapiens	Mutation(s): 0  Gene Names: CFL1 (CFL)
Find proteins for P23528 (Homo sapiens) Go to Gene View: CFL1 Go to UniProtKB:  P23528

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 140 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• Olderado: 1Q8G Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-08-21 
• Released Date: 2004-07-06 
• Deposition Author(s): Pope, B.J., Zierler-Gould, K.M., Kuhne, R., Weeds, A.G., Ball, L.J.

Revision History 

• Version 1.0: 2004-07-06
  Type: Initial release
• Version 1.1: 2008-04-29
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance