Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 23858.88 
• Atom Count: 1660 
• Residue Count: 223 
• Unique protein chains: 1

2TIO

LOW PACKING DENSITY FORM OF BOVINE BETA-TRYPSIN IN CYCLOHEXANE

• DOI: 10.2210/pdb2TIO/pdb

• Classification: HYDROLASE
• Organism(s): Bos taurus


• Deposited: 1998-09-23 Released: 1998-09-30 
• Deposition Author(s): Huang, Q., Zhu, G., Tang, Q.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.93 Å
• R-Value Free: 0.228 
• R-Value Work: 0.179 

Literature

X-ray studies on two forms of bovine beta-trypsin crystals in neat cyclohexane.

Zhu, G., Huang, Q., Wang, Z., Qian, M., Jia, Y., Tang, Y.

(1998) Biochim.Biophys.Acta 1429: 142-150

• PubMed: 9920392 
• Primary Citation of Related Structures:  
  1TIO


• PubMed Abstract: 
  

Two orthorhombic forms (Vm values are 2.3 and 3.0 A3/Da) of bovine beta-trypsin crystals in neat cyclohexane were determined to 1.93 A resolution, by X-ray diffraction. Both structures in organic solvent are similar to those in aqueous solution. In the high packing density form, one cyclohexane molecule is found in a hydrophobic site near the active center. One sulfate locates at the active site with hydrogen or salt bond to the Ser-His catalytic diad, and five more sulfates bind on the molecular surface. The conformation of the side chains near the sulfates changed greatly. In the low packing density form, one cyclohexane and three sulfates are found. In both structures, one benzamidine molecule locates at the hydrophobic pocket of the active center. Most water molecules on the enzyme surface are retained except some with high temperature factors.

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Organizational Affiliation: 

Department of Chemistry, Peking University, Beijing, PR China.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PROTEIN (BETA-TRYPSIN)	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 4 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
HEX	A	HEXANE C6 H14 VLKZOEOYAKHREP-UHFFFAOYSA-N
BEN	A	BENZAMIDINE C7 H8 N2 PXXJHWLDUBFPOL-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.93 Å
• R-Value Free: 0.228 
• R-Value Work: 0.179 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 63.020	α = 90.00
b = 63.780	β = 90.00
c = 69.040	γ = 90.00

Software Package:

Software Name	Purpose
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-09-23 
• Released Date: 1998-09-30 
• Deposition Author(s): Huang, Q., Zhu, G., Tang, Q.

Revision History 

• Version 1.0: 1998-09-30
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance