1PPE

THE REFINED 2.0 ANGSTROMS X-RAY CRYSTAL STRUCTURE OF THE COMPLEX FORMED BETWEEN BOVINE BETA-TRYPSIN AND CMTI-I, A TRYPSIN INHIBITOR FROM SQUASH SEEDS (CUCURBITA MAXIMA): TOPOLOGICAL SIMILARITY OF THE SQUASH SEED INHIBITORS WITH THE CARBOXYPEPTIDASE A INHIBITOR FROM POTATOES


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Work: 0.151 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The refined 2.0 A X-ray crystal structure of the complex formed between bovine beta-trypsin and CMTI-I, a trypsin inhibitor from squash seeds (Cucurbita maxima). Topological similarity of the squash seed inhibitors with the carboxypeptidase A inhibitor from potatoes

Bode, W.Greyling, H.J.Huber, R.Otlewski, J.Wilusz, T.

(1989) FEBS Lett 242: 285-292

  • DOI: 10.1016/0014-5793(89)80486-7
  • Primary Citation of Related Structures:  
    1PPE

  • PubMed Abstract: 
  • The stoichiometric complex formed between bovine beta-trypsin and the Cucurbita maxima trypsin inhibitor I (CMTI-I) was crystallized and its X-ray crystal structure determined using Patterson search techniques. Its structure has been crystallographic ...

    The stoichiometric complex formed between bovine beta-trypsin and the Cucurbita maxima trypsin inhibitor I (CMTI-I) was crystallized and its X-ray crystal structure determined using Patterson search techniques. Its structure has been crystallographically refined to a final R value of 0.152 (6.0-2.0 A). CMTI-I is of ellipsoidal shape; it lacks helices or beta-sheets, but consists of turns and connecting short polypeptide stretches. The disulfide pairing is CYS-3I-20I, Cys-10I-22I and Cys-16I-28I. According to the polypeptide fold and disulfide connectivity its structure resembles that of the carboxypeptidase A inhibitor from potatoes. Thirteen of the 29 inhibitor residues are in direct contact with trypsin; most of them are in the primary binding segment Val-2I (P4)-Glu-9I (P4') which contains the reactive site bond Arg-5I-Ile-6I and is in a conformation observed also for other serine proteinase inhibitors.


    Related Citations: 
    • Ligand Binding: Proteinase-Protein Inhibitor Interactions
      Bode, W., Huber, R.
      (1991) Curr Opin Struct Biol 1: 45
    • Nuclear Magnetic Resonance Solution and X-Ray Structures of Squash Trypsin Inhibitor Exhibit the Same Conformation of the Proteinase Binding Loop
      Holak, T.A., Bode, W., Huber, R., Otlewski, J., Wilusz, T.
      (1989) J Mol Biol 210: 649
    • The Squash Family of Serine Proteinase Inhibitors. Amino Acid Sequences and Association Equilibrium Constants of Inhibitors from Squash, Summer Squash, Zucchini, and Cucumber Seeds
      Wieczorek, M., Otlewski, J., Cook, J., Parks, K., Leluk, J., Wilimowska-Pelc, A., Polanowski, A., Wilusz, T., Laskowski Junior, M.
      (1985) Biochem Biophys Res Commun 126: 646
    • Amino-Acid Sequence of Two Trypsin Isoinhibitors, Itd I and Itd III from Squash Seeds (Cucurbita Maxima)
      Wilusz, T., Wieczorek, M., Polanowski, A., Denton, A., Cook, J., Laskowski Junior, M.
      (1983) Hoppe Seylers Z Physiol Chem 364: 93
    • The Refined Crystal Structure of Bovine Beta-Trypsin at 1.8 Angstroms Resolution. Crystallographic Refinement, Calcium Binding Site, Benzamidine Binding Site and Active Site at Ph 7.0
      Bode, W., Schwager, P.
      (1975) J Mol Biol 98: 693

    Organizational Affiliation

    Max-Planck-Institut für Biochemie, Martinsried, FRG.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TRYPSINE223Bos taurusMutation(s): 0 
EC: 3.4.21.4
Find proteins for P00760 (Bos taurus)
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Go to UniProtKB:  P00760
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
TRYPSIN INHIBITOR CMTI-II29N/AMutation(s): 0 
Find proteins for P01074 (Cucurbita maxima)
Explore P01074 
Go to UniProtKB:  P01074
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Work: 0.151 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.28α = 90
b = 55.47β = 90
c = 74.59γ = 90
Software Package:
Software NamePurpose
SQUASHphasing
EREFrefinement

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 1991-10-24 
  • Released Date: 1994-01-31 
  • Deposition Author(s): Bode, W., Huber, R.

Revision History 

  • Version 1.0: 1994-01-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance