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

  • 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 ...

    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 and Mechanism of Chymotrypsin
      Blow, D.M.
      (1976) Acc Chem Res 9: 145
    • The Active Centers of Serine Proteinases
      Hartley, B.S.
      (1974) Ann N Y Acad Sci 227: 438
    • 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. V. The Atomic Structure of Tosyl-Alpha-Chymotrypsin at 2 Angstroms Resolution
      Birktoft, J.J., Blow, D.M.
      (1972) J Mol Biol 68: 187
    • Structure of Crystalline Methyl-Chymotrypsin
      Wright, C.S., Hess, G.P., Blow, D.M.
      (1972) J Mol Biol 63: 295
    • 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 Harb Symp Quant Biol 36: 63
    • Chymotrypsin-Chemical Properties and Catalysis
      Hess, G.P.
      (1971) The Enzymes,third Edition 3: 213
    • The Structure of Chymotrypsin
      Blow, D.M.
      (1971) The Enzymes,third Edition 3: 185
    • 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
    • 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
    • The Study of Alpha-Chymotrypsin by X-Ray Diffraction
      Blow, D.M.
      (1969) Biochem J 112: 261
    • 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
    • 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
    • Three-Dimensional Structure of Tosyl-Alpha-Chymotrypsin
      Matthews, B.W., Sigler, P.B., Henderson, R., Blow, D.M.
      (1967) Nature 214: 652

    Organizational Affiliation

    Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294; paulg@uab.edu.



Macromolecules

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ALPHA-CHYMOTRYPSIN AA,
D [auth E]
13Bos taurusMutation(s): 0 
EC: 3.4.21.1
UniProt
Find proteins for P00766 (Bos taurus)
Explore P00766 
Go to UniProtKB:  P00766
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00766
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ALPHA-CHYMOTRYPSIN AB,
E [auth F]
131Bos taurusMutation(s): 0 
EC: 3.4.21.1
UniProt
Find proteins for P00766 (Bos taurus)
Explore P00766 
Go to UniProtKB:  P00766
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00766
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChainsSequence 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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00766
Protein Feature View
Expand
  • 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

View Full Validation Report



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