Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 23.56 kDa 
• Atom Count: 1735 
• Residue Count: 223 
• Unique protein chains: 1

1TX7

Bovine Trypsin complexed with p-amidinophenylmethylphosphinic acid (AMPA)

• DOI: 10.2210/pdb1TX7/pdb

• Classification: HYDROLASE
• Organism(s): Bos taurus
• Mutation(s): No 


• Deposited: 2004-07-02 Released: 2005-09-20 
• Deposition Author(s): Cui, J., Marankan, F., Fu, W., Crich, D., Mesecar, A., Johnson, M.E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Free: 0.229 
• R-Value Work: 0.183 
• R-Value Observed: 0.183 

Literature

An oxyanion-hole selective serine protease inhibitor in complex with trypsin.

Cui, J., Marankan, F., Fu, W., Crich, D., Mesecar, A., Johnson, M.E.

(2002) Bioorg Med Chem 10: 41-46

• PubMed: 11738605 
• DOI: 10.1016/s0968-0896(01)00259-0
• Structures With Same Primary Citation


• PubMed Abstract: 
  

p-amidinophenylmethylphosphinic acid (AMPA) was designed, synthesized and crystallized in complex with trypsin to study interactions with the oxyanion hole at the S1 site. In comparison to benzamidine, AMPA shows improved activity, which the crystal structure demonstrates to result from hydrogen bonds between the negatively charged phosphinic acid group and the catalytic residues at the oxyanion hole.

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Organizational Affiliation: 

Center for Pharmaceutical Biotechnology, College of Pharmacy, University of Illinois at Chicago, 900 S. Ashland Avenue, M/C 870, Chicago, IL 60607-7173, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Trypsinogen	A	223	Bos taurus	Mutation(s): 0  EC: 3.4.21.4
Find proteins for P00760 (Bos taurus) Go to UniProtKB:  P00760

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
4CM	A	(4-CARBAMIMIDOYLPHENYL)-METHYL-PHOSPHINIC ACID C8 H11 N2 O2 P CVABPMXIKVDCLF-UHFFFAOYSA-N
CA	A	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
4CM	Ki:  25000   nM  PDBBind
4CM	Ki:  25000   nM  Binding MOAD

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Free: 0.229 
• R-Value Work: 0.183 
• R-Value Observed: 0.183 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 54.87	α = 90
b = 58.44	β = 90
c = 67.52	γ = 90

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-07-02 
• Released Date: 2005-09-20 
Deposition Author(s): Cui, J., Marankan, F., Fu, W., Crich, D., Mesecar, A., Johnson, M.E.

Revision History 

• Version 1.0: 2005-09-20
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-04-04
  Changes: Data collection