1IJ5

METAL-FREE STRUCTURE OF MULTIDOMAIN EF-HAND PROTEIN, CBP40, FROM TRUE SLIME MOLD

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.244 

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This is version 1.2 of the entry. See complete history. 


Literature

Metal-Free and Ca(2+)-Bound Structures of a Multidomain EF-Hand Protein, CBP40, from the Lower Eukaryote Physarum polycephalum

Iwasaki, W., Sasaki, H., Nakamura, A., Kohama, K., Tanokura, M.

(2003) Structure 11: 75-85

  • DOI: 10.1016/s0969-2126(02)00932-2
  • Primary Citation of Related Structures:  
    1IJ6, 1IJ5

  • PubMed Abstract: 

    • Acellular slime mold, Physarum polycephalum, has a unique wound-healing system. When cytoplasm of plasmodia is exposed to extracellular fluid, calcium binding protein 40 (CBP40) seals damaged areas, forming large aggregates Ca(2+) dependently. Part of the CBP40 is truncated at the N terminus by a proteinase in plasmodia (CBP40delta), which does not aggregate in the Ca(2+)-bound form ...

    Acellular slime mold, Physarum polycephalum, has a unique wound-healing system. When cytoplasm of plasmodia is exposed to extracellular fluid, calcium binding protein 40 (CBP40) seals damaged areas, forming large aggregates Ca(2+) dependently. Part of the CBP40 is truncated at the N terminus by a proteinase in plasmodia (CBP40delta), which does not aggregate in the Ca(2+)-bound form. Here we report the crystal structures of CBP40delta in both the metal-free and the Ca(2+)-bound states. Both structures consist of three domains: coiled-coil, intervening, and EF-hand. The topology of the EF-hand domain is similar to that of calpain. The N-terminal half of CBP40Delta interacts with the C-terminal EF-hands through a large hydrophobic interface, necessary for high Ca(2+) affinity. Conformational change upon Ca(2+) binding is small; however, the structure of CBP40delta provides novel insights into the mechanism of Ca(2+)-dependent oligomerization.

    Organizational Affiliation: 

    Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PLASMODIAL SPECIFIC LAV1-2 PROTEINA323Physarum polycephalumMutation(s): 0 
UniProt
Find proteins for P14725 (Physarum polycephalum)
Explore P14725 
Go to UniProtKB:  P14725
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.244 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.4α = 90
b = 64.4β = 90
c = 207.2γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALAdata scaling
MLPHAREphasing
CNSrefinement
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-02-11
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance