1K9B

Crystal structure of the bifunctional soybean Bowman-Birk inhibitor at 0.28 nm resolution. Structural peculiarities in a folded protein conformation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.308 
  • R-Value Work: 0.221 

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This is version 1.2 of the entry. See complete history


Literature

Crystal structure of the bifunctional soybean Bowman-Birk inhibitor at 0.28-nm resolution. Structural peculiarities in a folded protein conformation.

Voss, R.H.Ermler, U.Essen, L.O.Wenzl, G.Kim, Y.M.Flecker, P.

(1996) Eur J Biochem 242: 122-131

  • DOI: 10.1111/j.1432-1033.1996.0122r.x
  • Primary Citation of Related Structures:  
    1K9B

  • PubMed Abstract: 
  • The Bowman-Birk inhibitor from soybean is a small protein that contains a binary arrangement of trypsin-reactive and chymotrypsin-reactive subdomains. In this report, the crystal structure of this anticarcinogenic protein has been determined to 0.28-nm resolution by molecular replacement from crystals grown at neutral pH ...

    The Bowman-Birk inhibitor from soybean is a small protein that contains a binary arrangement of trypsin-reactive and chymotrypsin-reactive subdomains. In this report, the crystal structure of this anticarcinogenic protein has been determined to 0.28-nm resolution by molecular replacement from crystals grown at neutral pH. The crystal structure differs from a previously determined NMR structure [Werner, M. H. & Wemmer, D. E. (1992) Biochemistry 31, 999-1010] in the relative orientation of the two enzyme-insertion loops, in some details of the main chain trace, in the presence of favourable contacts in the trypsin-insertion loop, and in the orientation of several amino acid side chains. The proximity of Met27 and Gln48 in the X-ray structure contradicts the solution structure, in which these two side chains point away from each other. The significant effect of a Met27-->Ile replacement on the inhibitory activity of the chymotrypsin-reactive subdomain agrees with the X-ray structure. Exposed hydrophobic patches, the presence of charged amino acid residues, and the presence of water molecules in the protein interior are in contrast to standard proteins that comprise a hydrophobic core and exposed polar amino acids.


    Related Citations: 
    • Crystal Structure of Cancer Chemopreventive Bowman-Birk Inhibitor in Ternary Complex with Bovine Trypsin at 2.3 Ao Resolution. Structural Basis of Janus-faced Serine Protease Inhibitor Specificity
      Koepke, J., Ermler, U., Warkentin, E., Wenzl, G., Flecker, P.
      (2000) J Mol Biol 298: 477
    • Chemical synthesis, molecular cloning and expression of gene coding for a Bowman-Birk-type proteinase inhibitor
      Flecker, P.
      (1987) Eur J Biochem 166: 151
    • Mutational analysis of disulfide bonds in the trypsin-reactive subdomain of a Bowman-Birk-type inhibitor of trypsin and chymotrypsin. Cooperative versus autonomous refolding of subdomains
      Philipp, S., Kim, Y.M., Duerr, I., Wenzl, G., Vogt, M., Flecker, P.
      (1998) Eur J Biochem 251: 854
    • Template-directed protein folding into a metastable state of increased activity
      Flecker, P.
      (1995) Eur J Biochem 232: 528
    • A new and general procedure for refolding mutant Bowman-Birk-type proteinase inhibitors on trypsin-Sepharose as a matrix with complementary structure.
      Flecker, P.
      (1989) FEBS Lett 252: 153

    Organizational Affiliation

    Max-Planck-Institut für Biophysik, Frankfurt am Main, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BOWMAN-BIRK TYPE PROTEINASE INHIBITORA58Glycine maxMutation(s): 0 
Find proteins for P01055 (Glycine max)
Explore P01055 
Go to UniProtKB:  P01055
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.308 
  • R-Value Work: 0.221 
  • Space Group: P 41 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.1α = 90
b = 86.1β = 90
c = 86.1γ = 90
Software Package:
Software NamePurpose
WEISdata collection
ROTAVATA-AGROVATAdata reduction
X-PLORmodel building
X-PLORrefinement
WEISdata reduction
CCP4data scaling
ROTAVATA)data scaling
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-11-16
    Type: Initial release
  • Version 1.1: 2007-10-21
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance