Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 23471.15 
• Atom Count: 1652 
• Residue Count: 223 
• Unique protein chains: 1

1OSS

T190P STREPTOMYCES GRISEUS TRYPSIN IN COMPLEX WITH BENZAMIDINE

• DOI: 10.2210/pdb1OSS/pdb

• Classification: HYDROLASE
• Organism(s): Streptomyces griseus
• Expression System: Bacillus subtilis
• Mutation(s): 1 


• Deposited: 2003-03-20 Released: 2003-08-19 
• Deposition Author(s): Page, M.J., Wong, S.L., Hewitt, J., Strynadka, N.C., MacGillivray, R.T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.93 Å
• R-Value Free: 0.212 
• R-Value Work: 0.167 

Literature

Engineering the Primary Substrate Specificity of Streptomyces griseus Trypsin.

Page, M.J., Wong, S.L., Hewitt, J., Strynadka, N.C., MacGillivray, R.T.

(2003) Biochemistry 42: 9060-9066

• PubMed: 12885239 
• DOI: 10.1021/bi0344230
• Primary Citation of Related Structures:  
  1OS8


• PubMed Abstract: 
  

Streptomyces griseus trypsin (SGT) was chosen as a model scaffold for the development of serine proteases with enhanced substrate specificity. Recombinant SGT has been produced in a Bacillus subtilis expression system in a soluble active form and purified to homogeneity. The recombinant and native proteases have nearly identical enzymatic properties and structures. Four SGT mutants with alterations in the S1 substrate binding pocket (T190A, T190P, T190S, and T190V) were also expressed. The T190P mutant demonstrated the largest shift to a preference for Arg versus Lys in the P1 site. This was shown by a minor reduction in catalytic activity toward an Arg-containing substrate (k(cat) reduction of 25%). The crystal structures of the recombinant SGT and the T190P mutant in a complex with the inhibitor benzamidine were obtained at high resolution (approximately 1.9 A). The increase in P1 specificity, achieved with minimal effect on the catalytic efficiency, demonstrates that the T190P mutant is an ideal candidate for the design of additional substrate specificity engineered into the S2 to S4 binding pockets.

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Related Citations: 

• Refined Crystal Structure of Streptomyces Griseus Trypsin at 1.7 Angstroms Resolution
  Read, R.J.,James, M.N.G.
  (1988) J.Mol.Biol. 200: 523
• Critical Comparison of Comparative Model Building of Streptomyces Griseus Trypsin
  Read, R.J.,Brayer, G.D.,Jurasek, L.,James, M.N.G.
  (1984) Biochemistry 23: 6570




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Organizational Affiliation: 

Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
trypsin	A	223	Streptomyces griseus	Mutation(s): 1  Gene Names: sprT EC: 3.4.21.4
Find proteins for P00775 (Streptomyces griseus) Go to UniProtKB:  P00775

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
SO4	A	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
CA	A	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
BEN	A	BENZAMIDINE C7 H8 N2 PXXJHWLDUBFPOL-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
BEN	Ki: 16400 nM BINDINGMOAD
BEN	Ki: 16400 nM PDBBIND

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.93 Å
• R-Value Free: 0.212 
• R-Value Work: 0.167 
• Space Group: C 2 2 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 50.079	α = 90.00
b = 69.601	β = 90.00
c = 119.829	γ = 90.00

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
CNS	phasing
XTALVIEW	refinement
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-03-20 
• Released Date: 2003-08-19 
• Deposition Author(s): Page, M.J., Wong, S.L., Hewitt, J., Strynadka, N.C., MacGillivray, R.T.

Revision History 

• Version 1.0: 2003-08-19
  Type: Initial release
• Version 1.1: 2008-04-29
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance