1GHB

A SECOND ACTIVE SITE IN CHYMOTRYPSIN? THE X-RAY CRYSTAL STRUCTURE OF N-ACETYL-D-TRYPTOPHAN BOUND TO GAMMA-CHYMOTRYPSIN

• PDB DOI: https://doi.org/10.2210/pdb1GHB/pdb

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


• Deposited: 1994-04-06 Released: 1994-06-22 
• Deposition Author(s): Yennawar, H.P., Yennawar, N.H., Farber, G.K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Work: 0.152 
• R-Value Observed: 0.152 

Literature

A STRUCTURAL EXPLANATION FOR ENZYME MEMORY IN NONAQUEOUS SOLVENTS.

Yennawar, H.P., Yennawar, N.H., Farber, G.K.

(1995) J Am Chem Soc 117: 577-585

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Hetero 8-mer - A2B2C2D2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 8-mer - A2B2C1D1E1F1 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Hetero 8-mer - A2B2C2D2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 8-mer - A2B2C1D1E1F1 

Biological assembly 2 generated by PISA (software)

Biological Assembly 3  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A1B1C1D1 

Biological assembly 3 generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 26.37 kDa 
• Atom Count: 2,123 
• Modelled Residue Count: 240 
• Deposited Residue Count: 244 
• Unique protein chains: 4

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
GAMMA-CHYMOTRYPSIN	A [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
GAMMA-CHYMOTRYPSIN	B [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
GAMMA-CHYMOTRYPSIN	C [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

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
PRO-GLY-ALA	D [auth P]	3	N/A	Mutation(s): 0

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
TRP	F [auth E]	TRYPTOPHAN C11 H12 N2 O2 QIVBCDIJIAJPQS-VIFPVBQESA-N
HEX	G [auth E], H [auth E], I [auth F], J [auth F], L [auth G]	HEXANE C6 H14 VLKZOEOYAKHREP-UHFFFAOYSA-N
IPA	K [auth F], M [auth G], N [auth G]	ISOPROPYL ALCOHOL C3 H8 O KFZMGEQAYNKOFK-UHFFFAOYSA-N
ACE	E	ACETYL GROUP C2 H4 O IKHGUXGNUITLKF-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Work: 0.152 
• R-Value Observed: 0.152 
• Space Group: P 4₂ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 69.6	α = 90
b = 69.6	β = 90
c = 97.51	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1994-06-22 
Deposition Author(s): Yennawar, H.P., Yennawar, N.H., Farber, G.K.

Revision History  

• Version 1.0: 1994-06-22
  Type: Initial release
  
• Version 1.1: 2008-03-06
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
• Version 1.3: 2024-06-05
  Changes: Data collection, Database references, Derived calculations, Other