1C2A

CRYSTAL STRUCTURE OF BARLEY BBI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal structure of a 16 kDa double-headed Bowman-Birk trypsin inhibitor from barley seeds at 1.9 A resolution.

Song, H.K.Kim, Y.S.Yang, J.K.Moon, J.Lee, J.Y.Suh, S.W.

(1999) J.Mol.Biol. 293: 1133-1144

  • DOI: 10.1006/jmbi.1999.3239
  • Also Cited By: 1TX6

  • PubMed Abstract: 
  • The Bowman-Birk trypsin inhibitor from barley seeds (BBBI) consists of 125 amino acid residues with two inhibitory loops. Its crystal structure in the free state has been determined by the multiwavelength anomalous diffraction (MAD) method and has be ...

    The Bowman-Birk trypsin inhibitor from barley seeds (BBBI) consists of 125 amino acid residues with two inhibitory loops. Its crystal structure in the free state has been determined by the multiwavelength anomalous diffraction (MAD) method and has been refined to a crystallographic R-value of 19.1 % for 8.0-1.9 A data. This is the first report on the structure of a 16 kDa double-headed Bowman-Birk inhibitor (BBI) from monocotyledonous plants and provides the highest resolution picture of a BBI to date. The BBBI structure consists of 11 beta-strands and the loops connecting these beta-strands but it lacks alpha-helices. BBBI folds into two compact domains of similar tertiary structure. Each domain shares the same overall fold with 8 kDa dicotyledonous BBIs. The five disulfide bridges in each domain are a subset of the seven disulfide bridges in 8 kDa dicotyledonous BBIs. Two buried water molecules form hydrogen bonds to backbone atoms in the core of each domain. One interesting feature of this two-domain inhibitor structure is that the two P1 residues (Arg17 and Arg76) are approximately 40 A apart, allowing the two reactive-site loops to bind to and to inhibit two trypsin molecules simultaneously and independently. The conformations of the reactive-site loops of BBBI are highly similar to those of other substrate-like inhibitors. This structure provides the framework for modeling of the 1:2 complex between BBBI and trypsin.


    Related Citations: 
    • Preliminary X-ray Crystallographic Analysis of Bowman-Birk Trypsin Inhibitor from Barley Seeds
      Song, H.K.,Suh, S.W.
      (1998) Acta Crystallogr.,Sect.D 54: 441


    Organizational Affiliation

    College of Natural Sciences, Seoul National University, Seoul, 151-742, Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BOWMAN-BIRK TRYPSIN INHIBITOR
A
120Hordeum vulgareGene Names: BBBI
Find proteins for P12940 (Hordeum vulgare)
Go to UniProtKB:  P12940
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.191 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 62.480α = 90.00
b = 62.480β = 90.00
c = 94.630γ = 90.00
Software Package:
Software NamePurpose
ROTAVATAdata scaling
CCP4data scaling
ROTAVATAdata reduction
X-PLORrefinement
WEISdata scaling
SHARPphasing
Agrovatadata reduction
WEISdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-12-29
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description