1AU9

SUBTILISIN BPN' MUTANT 8324 IN CITRATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Work: 0.151 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Large increases in general stability for subtilisin BPN' through incremental changes in the free energy of unfolding.

Pantoliano, M.W.Whitlow, M.Wood, J.F.Dodd, S.W.Hardman, K.D.Rollence, M.L.Bryan, P.N.

(1989) Biochemistry 28: 7205-7213

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Six individual amino acid substitutions at separate positions in the tertiary structure of subtilisin BPN' (EC 3.4.21.14) were found to increase the stability of this enzyme, as judged by differential scanning calorimetry and decreased rates of therm ...

    Six individual amino acid substitutions at separate positions in the tertiary structure of subtilisin BPN' (EC 3.4.21.14) were found to increase the stability of this enzyme, as judged by differential scanning calorimetry and decreased rates of thermal inactivation. These stabilizing changes, N218S, G169A, Y217K, M50F, Q206C, and N76D, were discovered through the use of five different investigative approaches: (1) random mutagenesis; (2) design of buried hydrophobic side groups; (3) design of electrostatic interactions at Ca2+ binding sites; (4) sequence homology consensus; and (5) serendipity. Individually, the six amino acid substitutions increase the delta G of unfolding between 0.3 and 1.3 kcal/mol at 58.5 degrees C. The combination of these six individual stabilizing mutations together into one subtilisin BPN' molecule was found to result in approximately independent and additive increases in the delta G of unfolding to give a net increase of 3.8 kcal/mol (58.5 degrees C). Thermodynamic stability was also shown to be related to resistance to irreversible inactivation, which included elevated temperatures (65 degrees C) or extreme alkalinity (pH 12.0). Under these denaturing conditions, the rate of inactivation of the combination variant is approximately 300 times slower than that of the wild-type subtilisin BPN'. A comparison of the 1.8-A-resolution crystal structures of mutant and wild-type enzymes revealed only independent and localized structural changes around the site of the amino acid side group substitutions.(ABSTRACT TRUNCATED AT 250 WORDS)


    Related Citations: 
    • The Engineering of Binding Affinity at Metal Ion Binding Sites for the Stabilization of Proteins: Subtilisin as a Test Case
      Pantoliano, M.W.,Whitlow, M.,Wood, J.F.,Rollence, M.L.,Finzel, B.C.,Gilliland, G.L.,Poulos, T.L.,Bryan, P.N.
      (1988) Biochemistry 27: 8311
    • Protein Engineering of Subtilisin Bpn': Enhanced Stabilization Through the Introduction of Two Cysteines to Form a Disulfide Bond
      Pantoliano, M.W.,Ladner, R.C.,Bryan, P.N.,Rollence, M.L.,Wood, J.F.,Poulos, T.L.
      (1987) Biochemistry 26: 2077
    • Atomic Coordinates for Subtilisin Bpn' (or Novo)
      Alden, R.A.,Birktoft, J.J.,Kraut, J.,Robertus, J.D.,Wright, C.S.
      (1971) Biochem.Biophys.Res.Commun. 45: 337
    • Proteases of Enhanced Stability: Characterization of a Thermostable Variant of Subtilisin
      Bryan, P.N.,Rollence, M.L.,Pantoliano, M.W.,Wood, J.,Finzel, B.C.,Gilliland, G.L.,Howard, A.J.,Poulos, T.L.
      (1986) Proteins 1: 326


    Organizational Affiliation

    Genex Corporation, Gaithersburg, Maryland 20877.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SUBTILISIN BPN'
A
275Bacillus amyloliquefaciensMutation(s): 7 
Gene Names: apr
EC: 3.4.21.62
Find proteins for P00782 (Bacillus amyloliquefaciens)
Go to UniProtKB:  P00782
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
UNX
Query on UNX

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Download CCD File 
A
UNKNOWN ATOM OR ION
X
*
 Ligand Interaction
IPA
Query on IPA

Download SDF File 
Download CCD File 
A
ISOPROPYL ALCOHOL
2-PROPANOL
C3 H8 O
KFZMGEQAYNKOFK-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Work: 0.151 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 41.640α = 90.00
b = 79.450β = 114.53
c = 37.260γ = 90.00
Software Package:
Software NamePurpose
XENGENdata reduction
XENGENdata collection
PROLSQrefinement
PROLSQ/PROFFTmodel building
XENGENdata scaling
PROFFTrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-12-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance