4CHA

STRUCTURE OF ALPHA-*CHYMOTRYPSIN REFINED AT 1.68 ANGSTROMS RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.68 Å

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of alpha-chymotrypsin refined at 1.68 A resolution.

Tsukada, H.Blow, D.M.

(1985) J Mol Biol 184: 703-711

  • DOI: https://doi.org/10.1016/0022-2836(85)90314-6
  • Primary Citation of Related Structures:  
    4CHA

  • PubMed Abstract: 

    Diffraction data for alpha-chymotrypsin crystals at -10 degrees C were measured at 1.68 A resolution and refined by restrained structure-factor least-squares refinement. The two independent chymotrypsin molecules in the crystallographic asymmetric unit were refined independently. The overall structure of alpha-chymotrypsin is little changed from published co-ordinates. The root-mean-square shift of C alpha co-ordinates is 0.42 A, co-ordinates for the two molecules showing a root-mean-square difference of 0.19 A. Certain regions with high disorder (residues 9 to 14, 73 to 79) remain difficult to interpret and several side-chains are disordered. Some water molecule positions have been changed. The absence of the tosyl group has made a significant difference to the refined structure at the active site. This now agrees closely with other enzymes of the trypsin family that have been refined at high resolution. There is a strong hydrogen bond between N epsilon 2 (His57) and O gamma (Ser195) in the free enzyme, in line with the published description of the charge relay system.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ALPHA-CHYMOTRYPSIN AA,
D [auth E]
13Bos taurusMutation(s): 0 
EC: 3.4.21.1
UniProt
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Go to UniProtKB:  P00766
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UniProt GroupP00766
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
ALPHA-CHYMOTRYPSIN AB,
E [auth F]
131Bos taurusMutation(s): 0 
EC: 3.4.21.1
UniProt
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Go to UniProtKB:  P00766
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UniProt GroupP00766
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
ALPHA-CHYMOTRYPSIN AC,
F [auth G]
97Bos taurusMutation(s): 0 
EC: 3.4.21.1
UniProt
Find proteins for P00766 (Bos taurus)
Explore P00766 
Go to UniProtKB:  P00766
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UniProt GroupP00766
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.68 Å
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.23α = 90
b = 67.39β = 101.8
c = 65.99γ = 90

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1985-04-01
    Type: Initial release
  • Version 1.1: 2008-03-25
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-06-05
    Changes: Data collection, Database references, Other