2TLD

CRYSTAL STRUCTURE OF AN ENGINEERED SUBTILISIN INHIBITOR COMPLEXED WITH BOVINE TRYPSIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Work: 0.173 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of an engineered subtilisin inhibitor complexed with bovine trypsin.

Takeuchi, Y.Nonaka, T.Nakamura, K.T.Kojima, S.Miura, K.Mitsui, Y.

(1992) Proc.Natl.Acad.Sci.USA 89: 4407-4411


  • PubMed Abstract: 
  • Proteinase specificity of a proteinaceous inhibitor of subtilisin (SSI; Streptomyces subtilisin inhibitor) can be altered so as to strongly inhibit trypsin simply by replacing P1 methionine with lysine (with or without concomitant change of the P4 re ...

    Proteinase specificity of a proteinaceous inhibitor of subtilisin (SSI; Streptomyces subtilisin inhibitor) can be altered so as to strongly inhibit trypsin simply by replacing P1 methionine with lysine (with or without concomitant change of the P4 residue) through site-directed mutagenesis. Now the crystal structure of one such engineered SSI (P1 methionine converted to lysine and P4 methionine converted to glycine) complexed with bovine trypsin has been solved at 2.6 A resolution and refined to a crystallographic R factor of 0.173. Comparing this structure with the previously established structure of the native SSI complexed with subtilisin BPN', it was found that (i) P1 lysine of the mutant SSI is accommodated in the S1 pocket of trypsin as usual, and (ii) upon complex formation, considerable conformation change occurs to the reactive site loop of the mutant SSI. Thus, in this case, flexibility of the reactive site loop seems important for successfully changing the proteinase specificity through mere replacement of the P1 residue.


    Related Citations: 
    • Refined Crystal Structure of the Complex of Subtilisin Bpn' and Streptomyces Subtilisin Inhibitor at 1.8 Angstroms Resolution
      Takeuchi, Y.,Satow, Y.,Nakamura, K.T.,Mitsui, Y.
      (1991) J.Mol.Biol. 221: 309


    Organizational Affiliation

    Pharmaceutical Research Center, Meiji Seika Kaisha, Ltd., Yokohama, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRYPSIN
E
220Bos taurusEC: 3.4.21.4
Find proteins for P00760 (Bos taurus)
Go to UniProtKB:  P00760
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
STREPTOMYCES SUBTILISIN INHIBITOR (SSI)
I
110Streptomyces albogriseolusGene Names: ssi
Find proteins for P01006 (Streptomyces albogriseolus)
Go to UniProtKB:  P01006
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Work: 0.173 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 110.900α = 90.00
b = 116.800β = 90.00
c = 64.300γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1992-07-15
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance