1GNV

CALCIUM INDEPENDENT SUBTILISIN BPN' MUTANT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.176 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Basis of Thermostability. Analysis of Stabilizing Mutations in Subtilisin Bpn'.

Almog, O.Gallagher, D.T.Ladner, J.E.Strausberg, S.Alexander, P.Bryan, P.Gilliland, G.L.

(2002) J.Biol.Chem. 277: 27553

  • DOI: 10.1074/jbc.M111777200
  • Primary Citation of Related Structures:  1GNS

  • PubMed Abstract: 
  • The crystal structures of two thermally stabilized subtilisin BPN' variants, S63 and S88, are reported here at 1.8 and 1.9 A resolution, respectively. The micromolar affinity calcium binding site (site A) has been deleted (Delta75-83) in these varian ...

    The crystal structures of two thermally stabilized subtilisin BPN' variants, S63 and S88, are reported here at 1.8 and 1.9 A resolution, respectively. The micromolar affinity calcium binding site (site A) has been deleted (Delta75-83) in these variants, enabling the activity and thermostability measurements in chelating conditions. Each of the variants includes mutations known previously to increase the thermostability of calcium-independent subtilisin in addition to new stabilizing mutations. S63 has eight amino acid replacements: D41A, M50F, A73L, Q206W, Y217K, N218S, S221C, and Q271E. S63 has 75-fold greater stability than wild type subtilisin in chelating conditions (10 mm EDTA). The other variant, S88, has ten site-specific changes: Q2K, S3C, P5S, K43N, M50F, A73L, Q206C, Y217K, N218S, and Q271E. The two new cysteines form a disulfide bond, and S88 has 1000 times greater stability than wild type subtilisin in chelating conditions. Comparisons of the two new crystal structures (S63 in space group P2(1) with A cell constants 41.2, 78.1, 36.7, and beta = 114.6 degrees and S88 in space group P2(1)2(1)2(1) with cell constants 54.2, 60.4, and 82.7) with previous structures of subtilisin BPN' reveal that the principal changes are in the N-terminal region. The structural bases of the stabilization effects of the new mutations Q2K, S3C, P5S, D41A, Q206C, and Q206W are generally apparent. The effects are attributed to the new disulfide cross-link and to improved hydrophobic packing, new hydrogen bonds, and other rearrangements in the N-terminal region.


    Organizational Affiliation

    Department of Clinical Biochemistry, Faculty of Health Sciences, Ben-Gurion University, Beer-Sheva 84105, Israel.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SUBTILISIN BPN'
A
266Bacillus amyloliquefaciensGene Names: apr
EC: 3.4.21.62
Find proteins for P00782 (Bacillus amyloliquefaciens)
Go to UniProtKB:  P00782
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MIS
Query on MIS
A
L-PEPTIDE LINKINGC6 H14 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.176 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 54.200α = 90.00
b = 60.400β = 90.00
c = 82.700γ = 90.00
Software Package:
Software NamePurpose
XENGENdata reduction
AMoREphasing
PROLSQrefinement
XENGENdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-06-24
    Type: Initial release
  • Version 1.1: 2011-06-02
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance