Experimental Data Snapshot

  • Resolution: 1.59 Å
  • R-Value Work: 0.174 

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1.59 A structure of trypsin at 120 K: comparison of low temperature and room temperature structures.

Earnest, T.Fauman, E.Craik, C.S.Stroud, R.

(1991) Proteins 10: 171-187

  • DOI: https://doi.org/10.1002/prot.340100303
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The structure of a rat trypsin mutant [S195C] at a temperature of 120 K has been refined to a crystallographic R factor of 17.4% between 12.0 and 1.59 A and is compared with the structure of the D102N mutant at 295 K. A reduction in the unit cell dimensions in going from room temperature to low temperature is accompanied by a decrease in molecular surface area and radius of gyration. The overall structure remains similar to that at room temperature. The attainable resolution appears to be improved due to the decrease in the fall off of intensities with resolution [reduction of the temperature factor]. This decreases the uncertainty in the atomic positions and allows the localization of more protein atoms and solvent molecules in the low temperature map. The largest differences between the two models occur at residues with higher than average temperature factors. Several features can be localized in the solvent region of the 120 K map that are not seen in the 295 K map. These include several more water molecules as well as an interstitial sulfate ion and two interstitial benzamidine molecules.

  • Organizational Affiliation

    Department of Biochemistry, University of California School of Medicine, San Francisco 94143-0448.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TRYPSIN223Rattus rattusMutation(s): 1 
Find proteins for P00763 (Rattus norvegicus)
Explore P00763 
Go to UniProtKB:  P00763
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00763
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.59 Å
  • R-Value Work: 0.174 
  • Space Group: I 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 123.12α = 90
b = 123.12β = 90
c = 123.12γ = 90
Software Package:
Software NamePurpose
XENGENdata collection
XENGENdata reduction
XENGENdata scaling

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 1997-07-07 
  • Deposition Author(s): Stroud, R.M.

Revision History  (Full details and data files)

  • Version 1.0: 1997-07-07
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-11-03
    Changes: Database references, Derived calculations, Other