1A2Q

SUBTILISIN BPN' MUTANT 7186


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Work: 0.145 

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

  • DOI: 10.1021/bi00444a012
  • Primary Citation of Related Structures:  
    1S01, 1A2Q, 1AK9, 1AU9

  • 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: 
    • 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
    • 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
    • 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

    Organizational Affiliation

    Genex Corporation, Gaithersburg, Maryland 20877.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SUBTILISIN BPN'A275Bacillus amyloliquefaciensMutation(s): 5 
Gene Names: apr
EC: 3.4.21.62
Find proteins for P00782 (Bacillus amyloliquefaciens)
Explore P00782 
Go to UniProtKB:  P00782
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACN
Query on ACN

Download CCD File 
A
ACETONE
C3 H6 O
CSCPPACGZOOCGX-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MIS
Query on MIS
AL-PEPTIDE LINKINGC6 H14 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Work: 0.145 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.64α = 90
b = 79.45β = 114.53
c = 37.26γ = 90
Software Package:
Software NamePurpose
XENGENdata collection
XENGENdata reduction
PROLSQ/PROFFTmodel building
PROFFTrefinement
PROLSQrefinement
XENGENdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-04-29
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance