1U5I

Crystal Structure analysis of rat m-calpain mutant Lys10 Thr


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.86 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Activation of calpain by Ca2+: roles of the large subunit N-terminal and domain III-IV linker peptides

Hosfield, C.M.Elce, J.S.Jia, Z.

(2004) J.Mol.Biol. 343: 1049-1053

  • DOI: 10.1016/j.jmb.2004.08.073

  • PubMed Abstract: 
  • The calpains are a family of cysteine proteases with closely related amino acid sequences, but a wide range of Ca(2+) requirements (K(d)). For m-calpain, K(d) is approximately 325microM, for mu-calpain it is approximately 50microM, and for calpain 3 ...

    The calpains are a family of cysteine proteases with closely related amino acid sequences, but a wide range of Ca(2+) requirements (K(d)). For m-calpain, K(d) is approximately 325microM, for mu-calpain it is approximately 50microM, and for calpain 3 it is not strictly known but may be approximately 0.1microM. On the basis of previous structure determination of m-calpain we postulated that two regions of the calpain large subunits, the N-terminal peptide (residues 1-20) and a domain III-IV linker peptide (residues 514-530 in m-calpain) were important in defining K(d). The mutations Lys10Thr in the N-terminal peptide, and Glu517Pro in the domain linker peptide, reduced K(d) of m-calpain by 30% and 42%, respectively, revealing that these two regions are functionally important. The increased Ca(2+)-sensitivity of these mutants demonstrate that the Lys10-Asp148 salt link and the short beta-sheet interaction involving Glu517 are factors contributing to the high K(d) of m-calpain. Though these two regions are physically remote from the active site and Ca(2+)-binding site, they play significant roles in regulating the response of calpain to Ca(2+). Differences in these interactions in mu-calpain and in calpain 3 are also consistent with their progressively lower K(d) values.


    Organizational Affiliation

    Department of Biochemistry, Queen's University, Kingston, Ont., Canada K7L 3N6.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calpain 2, large [catalytic] subunit precursor
A
700Rattus norvegicusMutation(s): 2 
Gene Names: Capn2
EC: 3.4.22.53
Find proteins for Q07009 (Rattus norvegicus)
Go to UniProtKB:  Q07009
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Calpain small subunit 1
B
184Rattus norvegicusMutation(s): 0 
Gene Names: Capns1 (Capn4, Css1)
Find proteins for Q64537 (Rattus norvegicus)
Go to UniProtKB:  Q64537
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.86 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.191 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 51.658α = 90.00
b = 156.520β = 95.39
c = 64.227γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
EPMRphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-01-18
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance