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 1.2 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


  • 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 un ...

    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.


    Related Citations: 
    • Structure of Crystalline Alpha-Chymotrypsin. Iv. The Structure of Indoleacryloyl-Alpha-Chymotrypsin and its Relevance to the Hydrolytic Mechanism of the Enzyme
      Henderson, R.
      (1970) J.Mol.Biol. 54: 341
    • Structure and Mechanism of Chymotrypsin
      Blow, D.M.
      (1976) Acc.Chem.Res. 9: 145
    • Comparison of the Crystal Structures of Chymotrypsinogen-A and Alpha-Chymotrypsin
      Wright, H.T.
      (1973) J.Mol.Biol. 79: 1
    • Structure of Crystalline Alpha-Chymotrypsin. II. A Preliminary Report Including a Hypothesis for the Activation Mechanism
      Sigler, P.B.,Blow, D.M.,Matthews, B.W.,Henderson, R.
      (1968) J.Mol.Biol. 35: 143
    • Structure of Crystalline Alpha-Chymotrypsin. III. Crystallographic Studies of Substrates and Inhibitors Bound to the Active Site of Alpha-Chymotrypsin
      Steitz, T.A.,Henderson, R.,Blow, D.M.
      (1969) J.Mol.Biol. 46: 337
    • The Active Centers of Serine Proteinases
      Hartley, B.S.
      (1974) Ann.N.Y.Acad.Sci. 227: 438
    • The Structure of Chymotrypsin
      Blow, D.M.
      (1971) The Enzymes,Third Edition 3: 185
    • The Study of Alpha-Chymotrypsin by X-Ray Diffraction
      Blow, D.M.
      (1969) Biochem.J. 112: 261
    • Three-Dimensional Structure of Tosyl-Alpha-Chymotrypsin
      Matthews, B.W.,Sigler, P.B.,Henderson, R.,Blow, D.M.
      (1967) Nature 214: 652
    • Alpha-Chymotrypsin,What Can We Learn About Catalysis from X-Ray Diffraction (Query).
      Henderson, R.,Wright, C.S.,Hess, G.P.,Blow, D.M.
      (1972) Cold Spring Harbor Symp.Quant.Biol. 36: 63
    • Structure of Crystalline Alpha-Chymotrypsin. V. The Atomic Structure of Tosyl-Alpha-Chymotrypsin at 2 Angstroms Resolution
      Birktoft, J.J.,Blow, D.M.
      (1972) J.Mol.Biol. 68: 187
    • Chymotrypsin-Chemical Properties and Catalysis
      Hess, G.P.
      (1971) The Enzymes,Third Edition 3: 213
    • The Structure of Alpha-Chymotrypsin
      Birktoft, J.J.,Blow, D.M.,Henderson, R.,Steitz, T.A.
      (1970) Philos.Trans.R.Soc.London,Ser.B 257: 67
    • Structure of Crystalline Methyl-Chymotrypsin
      Wright, C.S.,Hess, G.P.,Blow, D.M.
      (1972) J.Mol.Biol. 63: 295



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ALPHA-CHYMOTRYPSIN A
A, E
13Bos taurusMutation(s): 0 
EC: 3.4.21.1
Find proteins for P00766 (Bos taurus)
Go to UniProtKB:  P00766
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ALPHA-CHYMOTRYPSIN A
B, F
131Bos taurusMutation(s): 0 
EC: 3.4.21.1
Find proteins for P00766 (Bos taurus)
Go to UniProtKB:  P00766
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
ALPHA-CHYMOTRYPSIN A
C, G
97Bos taurusMutation(s): 0 
EC: 3.4.21.1
Find proteins for P00766 (Bos taurus)
Go to UniProtKB:  P00766
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 = 49.230α = 90.00
b = 67.390β = 101.80
c = 65.990γ = 90.00

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1985-04-01
    Type: Initial release
  • Version 1.1: 2008-03-25
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance