1MB8 | pdb_00001mb8

Crystal Structure of the actin binding domain of plectin

• PDB DOI: https://doi.org/10.2210/pdb1MB8/pdb

• Classification: STRUCTURAL PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2002-08-02 Released: 2003-06-10 
• Deposition Author(s): de Pereda, J.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 
  0.261 (Depositor), 0.262 (DCC) 
• R-Value Work: 
  0.212 (Depositor), 0.212 (DCC) 

Literature

Structural and Functional Analysis of the Actin Binding Domain of Plectin Suggests Alternative Mechanisms for Binding to F-Actin and Integrin Beta4

Garcia-Alvarez, B., Bobkov, A., Sonnenberg, A., de Pereda, J.M.

(2003) Structure 11: 615-625

• PubMed: 12791251 
• DOI: https://doi.org/10.1016/s0969-2126(03)00090-x
• Primary Citation Related Structures: 
  1MB8


• PubMed Abstract: 
  

  Plectin is a widely expressed cytoskeletal linker. Here we report the crystal structure of the actin binding domain of plectin and show that this region is sufficient for interaction with F-actin or the cytoplasmic region of integrin alpha6beta4. The structure is formed by two calponin homology domains arranged in a closed conformation. We show that binding to F-actin induces a conformational change in plectin that is inhibited by an engineered interdomain disulfide bridge. A two-step induced fit mechanism involving binding and subsequent domain rearrangement is proposed. In contrast, interaction with integrin alpha6beta4 occurs in a closed conformation. Competitive binding of plectin to F-actin and integrin alpha6beta4 may rely on the observed alternative binding mechanisms and involve both allosteric and steric factors.

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Organizational Affiliation: 
• Program on Cell Adhesion, The Burnham Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 28.44 kDa 
• Atom Count: 2,154 
• Modeled Residue Count: 243 
• Deposited Residue Count: 243 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Plectin	A	243	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for Q15149 (Homo sapiens) Explore Q15149  Go to UniProtKB:  Q15149
PHAROS:  Q15149 GTEx:  ENSG00000178209

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free:  0.261 (Depositor), 0.262 (DCC) 
• R-Value Work:  0.212 (Depositor), 0.212 (DCC) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 33.597	α = 90
b = 79.283	β = 90
c = 82.37	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Released Date: 2003-06-10 
Deposition Author(s): de Pereda, J.M.

Revision History  

• Version 1.0: 2003-06-10
  Type: Initial release
  
• Version 1.1: 2008-04-28
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-02-14
  Changes: Data collection, Database references