1AAL

STRUCTURAL EFFECTS INDUCED BY MUTAGENESIS AFFECTED BY CRYSTAL PACKING FACTORS: THE STRUCTURE OF A 30-51 DISULFIDE MUTANT OF BASIC PANCREATIC TRYPSIN INHIBITOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Observed: 0.179 

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This is version 1.3 of the entry. See complete history


Literature

Structural effects induced by mutagenesis affected by crystal packing factors: the structure of a 30-51 disulfide mutant of basic pancreatic trypsin inhibitor.

Eigenbrot, C.Randal, M.Kossiakoff, A.A.

(1992) Proteins 14: 75-87

  • DOI: 10.1002/prot.340140109
  • Primary Citation of Related Structures:  
    1AAL

  • PubMed Abstract: 
  • The X-ray structure of the C30V/C51A disulfide mutant of basic pancreatic trypsin inhibitor (BPTI) has been analyzed at 1.6 A resolution. The mutant crystallizes in a cell having two molecules in the asymmetric unit. The packing environments of these two molecules are quite different, allowing for an assessment of which among the observed structural changes result from the mutation and which are produced by lattice packing considerations ...

    The X-ray structure of the C30V/C51A disulfide mutant of basic pancreatic trypsin inhibitor (BPTI) has been analyzed at 1.6 A resolution. The mutant crystallizes in a cell having two molecules in the asymmetric unit. The packing environments of these two molecules are quite different, allowing for an assessment of which among the observed structural changes result from the mutation and which are produced by lattice packing considerations. The removal of the 30-51 disulfide bridge has little apparent affect on the B-factors of segments of adjacent polypeptide chain, although there are distinct differences in the structure compared to wild-type BPTI crystal structures. Both of the two C30V/C51A molecules show differences at the mutation site when compared to another 30-51 disulfide mutant, C30A/C51A, presumably due to the larger steric bulk of a valine versus an alanine at residue 30. A comparison of the two independent C30V/C51A molecules indicates that there are significant differences between them even at the site of mutation. The description of the specific structural differences of each molecule differs in detail and suggests different conclusions about the nature of structural perturbation near 30-51. In addition, when these two molecules are compared to two different wild-type structures, which had been determined from different space groups, a somewhat different pattern of changes is observed. These findings indicate that crystal packing can influence the observed perturbations in mutant structures.


    Related Citations: 
    • Structural Effects Induced by Removal of a Disulfide Bridge: The X-Ray Structure of the C30A(Slash)C51A Mutant of Basic Pancreatic Trypsin Inhibitor at 1.6 Angstroms
      Eigenbrot, C., Randal, M., Kossiakoff, A.A.
      (1990) Protein Eng 3: 591

    Organizational Affiliation

    Department of Protein Engineering, Genentech Inc., South San Francisco, California 94080.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BOVINE PANCREATIC TRYPSIN INHIBITORA, B58Bos taurusMutation(s): 0 
UniProt
Find proteins for P00974 (Bos taurus)
Explore P00974 
Go to UniProtKB:  P00974
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download Ideal Coordinates CCD File 
C [auth B]PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Observed: 0.179 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.28α = 90
b = 89.58β = 90
c = 48.36γ = 90
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1993-10-31
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Derived calculations, Other