1B8C

PARVALBUMIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.300 
  • R-Value Observed: 0.197 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Metal-ion affinity and specificity in EF-hand proteins: coordination geometry and domain plasticity in parvalbumin.

Cates, M.S.Berry, M.B.Ho, E.L.Li, Q.Potter, J.D.Phillips Jr., G.N.

(1999) Structure 7: 1269-1278

  • DOI: https://doi.org/10.1016/s0969-2126(00)80060-x
  • Primary Citation of Related Structures:  
    1B8C, 1B8L, 1B8R, 1B9A

  • PubMed Abstract: 

    The EF-hand family is a large set of Ca(2+)-binding proteins that contain characteristic helix-loop-helix binding motifs that are highly conserved in sequence. Members of this family include parvalbumin and many prominent regulatory proteins such as calmodulin and troponin C. EF-hand proteins are involved in a variety of physiological processes including cell-cycle regulation, second messenger production, muscle contraction, microtubule organization and vision. We have determined the structures of parvalbumin mutants designed to explore the role of the last coordinating residue of the Ca(2+)-binding loop. An E101D substitution has been made in the parvalbumin EF site. The substitution decreases the Ca(2+)-binding affinity 100-fold and increases the Mg(2+)-binding affinity 10-fold. Both the Ca(2+)- and Mg(2+)-bound structures have been determined, and a structural basis has been proposed for the metal-ion-binding properties. The E101D mutation does not affect the Mg(2+) coordination geometry of the binding loop, but it does pull the F helix 1.1 A towards the loop. The E101D-Ca(2+) structure reveals that this mutant cannot obtain the sevenfold coordination preferred by Ca(2+), presumably because of strain limits imposed by tertiary structure. Analysis of these results relative to previously reported structural information supports a model wherein the characteristics of the last coordinating residue and the plasticity of the Ca(2+)-binding loop delimit the allowable geometries for the coordinating sphere.


  • Organizational Affiliation

    Department of Biochemistry and Cell Biology WM Keck Center for Computational Biology, Rice University, 6100 S. Main Street, Houston, TX 77005, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PROTEIN (PARVALBUMIN)
A, B
108Cyprinus carpioMutation(s): 0 
UniProt
Find proteins for P02618 (Cyprinus carpio)
Explore P02618 
Go to UniProtKB:  P02618
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02618
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.300 
  • R-Value Observed: 0.197 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 35.231α = 90
b = 50.211β = 99.22
c = 55.374γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
SHELXmodel building
SHELXL-97refinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing
SHELXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-02-02
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-03-07
    Changes: Data collection
  • Version 1.4: 2023-08-09
    Changes: Data collection, Database references, Derived calculations, Refinement description