2CHA

THE STRUCTURE OF CRYSTALLINE ALPHA-CHYMOTRYPSIN, $V.THE ATOMIC STRUCTURE OF TOSYL-ALPHA-CHYMOTRYPSIN AT 2 ANGSTROMS RESOLUTION

• PDB DOI: https://doi.org/10.2210/pdb2CHA/pdb

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


• Deposited: 1975-01-01 Released: 1977-01-18 
• Deposition Author(s): Birktoft, J.J., Blow, D.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å

Literature

Structure of crystalline -chymotrypsin. V. The atomic structure of tosyl- -chymotrypsin at 2 A resolution.

Birktoft, J.J., Blow, D.M.

(1972) J Mol Biol 68: 187-240

• PubMed: 5069789 
• DOI: https://doi.org/10.1016/0022-2836(72)90210-0
• Primary Citation of Related Structures:  
  2CHA

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Hetero 6-mer - A2B2C2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 6-mer - A2B2C1D1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 50.87 kDa 
• Atom Count: 3,542 
• Modelled Residue Count: 474 
• Deposited Residue Count: 482 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ALPHA-CHYMOTRYPSIN A	A, D [auth E]	13	Bos taurus	Mutation(s): 0  EC: 3.4.21.1
UniProt
Find proteins for P00766 (Bos taurus) Explore P00766  Go to UniProtKB:  P00766

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
ALPHA-CHYMOTRYPSIN A	B, E [auth F]	131	Bos taurus	Mutation(s): 0  EC: 3.4.21.1
UniProt
Find proteins for P00766 (Bos taurus) Explore P00766  Go to UniProtKB:  P00766

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
ALPHA-CHYMOTRYPSIN A	C, F [auth G]	97	Bos taurus	Mutation(s): 0  EC: 3.4.21.1
UniProt
Find proteins for P00766 (Bos taurus) Explore P00766  Go to UniProtKB:  P00766

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
TSU	G [auth C], H [auth G]	PARA-TOLUENE SULFONATE C7 H8 O3 S JOXIMZWYDAKGHI-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 49.1	α = 90
b = 67.4	β = 101.7
c = 65.9	γ = 90

Structure Validation

Entry History 

Deposition Data

• Released Date: 1977-01-18 
Deposition Author(s): Birktoft, J.J., Blow, D.M.

Revision History  

• Version 1.0: 1977-01-18
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Advisory, Version format compliance
• Version 1.3: 2011-08-24
  Changes: Non-polymer description
• Version 2.0: 2023-09-27
  Type: Remediation
  Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Other, Refinement description