1K6U

Crystal Structure of Cyclic Bovine Pancreatic Trypsin Inhibitor

• PDB DOI: https://doi.org/10.2210/pdb1K6U/pdb

• Classification: hydrolase inhibitor
• Organism(s): Bos taurus
• Mutation(s): Yes 


• Deposited: 2001-10-17 Released: 2001-12-19 
• Deposition Author(s): Botos, I., Wu, Z., Lu, W., Wlodawer, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.00 Å
• R-Value Free: 0.162 
• R-Value Work: 0.118 
• R-Value Observed: 0.128 

Literature

Crystal structure of a cyclic form of bovine pancreatic trypsin inhibitor.

Botos, I., Wu, Z., Lu, W., Wlodawer, A.

(2001) FEBS Lett 509: 90-94

• PubMed: 11734212 
• DOI: https://doi.org/10.1016/s0014-5793(01)03113-1
• Primary Citation of Related Structures:  
  1K6U


• PubMed Abstract: 
  

  The crystal structure of a cyclic form of a mutant of bovine pancreatic trypsin inhibitor has been solved at 1.0 A resolution. The protein was synthesized by native chemical ligation and its structure is almost indistinguishable from the previously described recombinant form of the same mutant; however, the new loop containing the former termini became much better ordered.

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Organizational Affiliation: 

Protein Structure Section, Macromolecular Crystallography Laboratory, National Cancer Institute at Frederick, MD 21702, USA.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 7.28 kDa 
• Atom Count: 673 
• Modelled Residue Count: 58 
• Deposited Residue Count: 58 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PANCREATIC TRYPSIN INHIBITOR	A	58	N/A	Mutation(s): 4
UniProt
Find proteins for P00974 (Bos taurus) Explore P00974  Go to UniProtKB:  P00974

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	B [auth A], C [auth A], D [auth A], E [auth A], F [auth A], G [auth A], H [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
EDO	I [auth A], J [auth A]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.00 Å
• R-Value Free: 0.162 
• R-Value Work: 0.118 
• R-Value Observed: 0.128 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 51.904	α = 90
b = 51.904	β = 90
c = 42.896	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
SHELX	model building
SHELXL-97	refinement
SHELX	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-12-19 
Deposition Author(s): Botos, I., Wu, Z., Lu, W., Wlodawer, A.

Revision History  

• Version 1.0: 2001-12-19
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-10-27
  Changes: Database references, Derived calculations
• Version 1.4: 2023-08-16
  Changes: Data collection, Refinement description