3SGB

STRUCTURE OF THE COMPLEX OF STREPTOMYCES GRISEUS PROTEASE B AND THE THIRD DOMAIN OF THE TURKEY OVOMUCOID INHIBITOR AT 1.8 ANGSTROMS RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Work: 0.125 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of the complex of Streptomyces griseus protease B and the third domain of the turkey ovomucoid inhibitor at 1.8-A resolution.

Read, R.J.Fujinaga, M.Sielecki, A.R.James, M.N.

(1983) Biochemistry 22: 4420-4433


  • PubMed Abstract: 
  • The structure of the complex between the serine protease Streptomyces griseus protease B (SGPB) and the third domain of the Kazal-type ovomucoid inhibitor from turkey has been solved at 1.8-A resolution and refined to a conventional R factor of 0.125 ...

    The structure of the complex between the serine protease Streptomyces griseus protease B (SGPB) and the third domain of the Kazal-type ovomucoid inhibitor from turkey has been solved at 1.8-A resolution and refined to a conventional R factor of 0.125. As others have reported previously for analogous complexes of proteases and protein inhibitors, the inhibitor binds in a fashion similar to that of a substrate; it is not cleaved, but there is a close approach (2.7 A) of the active site nucleophile Ser-195 O gamma to the carbonyl carbon of the reactive peptide bond of the inhibitor. Contrary to the structural reports regarding the other enzyme-inhibitor complexes, we conclude that there is no evidence for a significant distortion of this peptide bond from planarity. The mechanism of inhibition can be understood in terms of the equilibrium thermodynamic parameters Ka, the enzyme-inhibitor association constant, and Khyd, the equilibrium constant for inhibitor hydrolysis. These thermodynamic parameters can be rationalized in terms of the observed structure.


    Related Citations: 
    • Crystal and Molecular Structures of the Complex of Alpha-Chymotrypsin with its Inhibitor Turkey Ovomucoid Third Domain at 1.8 Angstroms Resolution
      Fujinaga, M.,Sielecki, A.R.,Read, R.J.,Ardelt, W.,Laskowskijunior, M.,James, M.N.G.
      (1987) J.Mol.Biol. 195: 397
    • Crystal Structure Studies and Inhibition Kinetics of Tripeptide Chloromethyl Ketone Inhibitors with Streptomyces Griseus Protease B
      James, M.N.G.,Brayer, G.D.,Delbaere, L.T.J.,Sielecki, A.R.,Gertler, A.
      (1980) J.Mol.Biol. 139: 423
    • Tertiary Structural Differences between Microbial Serine Proteases and Pancreatic Serine Enzymes
      Delbaere, L.T.J.,Hutcheon, W.L.B.,James, M.N.G.,Theissen, W.E.
      (1975) Nature 257: 758
    • 4.5 Angstroms Resolution Structure of a Bacterial Serine Protease from Streptomyces Griseus
      Codding, P.W.,Delbaere, L.T.J.,Hayakawa, K.,Hutcheon, W.L.B.,James, M.N.G.,Jurasek, L.
      (1974) Can.J.Biochem. 52: 208
    • Refined Crystal Structure of the Molecular Complex of Streptomyces Griseus Protease B, a Serine Protease, with the Third Domain of the Ovomucoid Inhibitor from Turkey
      Fujinaga, M.,Read, R.J.,Sielecki, A.,Ardelt, W.,Laskowski Junior, M.,James, M.N.G.
      (1982) Proc.Natl.Acad.Sci.USA 79: 4868
    • Amino Acid Sequence Alignment of Bacterial and Mammalian Pancreatic Serine Proteases Based on Topological Equivalences
      James, M.N.G.,Delbaere, L.T.J.,Brayer, G.D.
      (1978) Can.J.Biochem. 56: 396
    • Relationship between the Structures and Activities of Some Microbial Serine Proteases. II. Comparison of the Tertiary Structures of Microbial and Pancreatic Serine Proteases
      James, M.N.G.
      (1976) Miami Winter Symp. 11: 125
    • The 2.8 Angstroms Resolution Structure of Streptomyces Griseus Protease B and its Homology with Alpha-Chymotrypsin and Streptomyces Griseus Protease A
      Delbaere, L.T.J.,Brayer, G.D.,James, M.M.G.
      (1979) Can.J.Biochem. 57: 135



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEINASE B (SGPB)
E
185Streptomyces griseusMutation(s): 0 
Gene Names: sprB
EC: 3.4.21.81
Find proteins for P00777 (Streptomyces griseus)
Go to UniProtKB:  P00777
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
TURKEY OVOMUCOID INHIBITOR (OMTKY3)
I
56Meleagris gallopavoMutation(s): 0 
Find proteins for P68390 (Meleagris gallopavo)
Go to UniProtKB:  P68390
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Work: 0.125 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 45.350α = 90.00
b = 54.520β = 119.20
c = 45.650γ = 90.00

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1983-07-12
    Type: Initial release
  • Version 1.1: 2008-03-25
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other