1B1U

CRYSTAL STRUCTURE OF THE BIFUNCTIONAL INHIBITOR RAGI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.321 
  • R-Value Work: 0.222 

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This is version 1.2 of the entry. See complete history

Literature

Structure of the bifunctional inhibitor of trypsin and alpha-amylase from ragi seeds at 2.2 A resolution.

Gourinath, S.Alam, N.Srinivasan, A.Betzel, C.Singh, T.P.

(2000) Acta Crystallogr.,Sect.D 56: 287-293


  • PubMed Abstract: 
  • The crystal structure of a bifunctional inhibitor of alpha-amylase and trypsin (RATI) from ragi seeds (Indian finger millet, Eleusine coracana Gaertneri) has been determined by X-ray diffraction at 2.2 A resolution. The inhibitor consists of 122 amin ...

    The crystal structure of a bifunctional inhibitor of alpha-amylase and trypsin (RATI) from ragi seeds (Indian finger millet, Eleusine coracana Gaertneri) has been determined by X-ray diffraction at 2.2 A resolution. The inhibitor consists of 122 amino acids, with five disulfide bridges, and belongs to the plant alpha-amylase/trypsin inhibitor family. The crystals were grown by the microdialysis method using ammonium sulfate as a precipitating agent. The structure was determined by the molecular-replacement method using as models the structures of Corn Hageman factor inhibitor (CHFI) and of RATI at 2.9 A resolution determined previously. It has been refined to an R factor of 21.9%. The structure shows an r.m.s. deviation for C(alpha) atoms of 2.0 A compared with its own NMR structure, whereas the corresponding value compared with CHFI is found to be 1.4 A. The r.m.s. difference for C(alpha) atoms when compared with the same protein in the structure of the complex with alpha-amylase is 0.7 A. The conformations of trypsin-binding loop and the alpha-amylase-binding N-terminal region were also found to be similar in the crystal structures of native RATI and its complex with alpha-amylase. These regions differed considerably in the NMR structure.


    Related Citations: 
    • Determination of the Three-Dimensional Structure of the Bifunctional Alpha-Amylase/Trypsin Inhibitor from Ragi Seeds by NMR Spectroscopy
      Strobl, S.,Muhlhahn, P.,Bernstein, R.,Wiltscheck, R.,Maskos, K.,Wunderlich, M.,Huber, R.,Glockshuber, R.,Holak, T.A.
      (1995) Biochemistry 34: 8281
    • Preliminary X-Ray Investigation of a Bifunctional Inhibitor from Indian Finger Millet (Ragi)
      Srinivasan, A.,Raman, A.,Singh, T.P.
      (1991) J.Mol.Biol. 222: 1
    • The Complete Amino Acid Sequence of the Bifunctional Alpha-Amylase/Trypsin Inhibitor from Seeds of Ragi (Indian Finger Millet, Eleusine Coracana Gaertn.)
      Campos, F.A.P.,Richardson, M.
      (1983) FEBS Lett. 152: 300


    Organizational Affiliation

    Department of Biophysics, All India Institute of Medical Sciences, New Delhi-110029, India.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (ALPHA-AMYLASE/TRYPSIN INHIBITOR RATI)
A
122Eleusine coracanaMutation(s): 0 
Find proteins for P01087 (Eleusine coracana)
Go to UniProtKB:  P01087
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.321 
  • R-Value Work: 0.222 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 47.380α = 90.00
b = 54.480β = 90.00
c = 40.350γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
X-PLORrefinement
AMoREphasing
CCP4phasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-12-02
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance