1BIP

BIFUNCTIONAL PROTEINASE INHIBITOR TRYPSIN/A-AMYLASE FROM SEEDS OF RAGI (ELEUSINE CORACANA GAERTNERI)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 20 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

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: 8281-8293


  • PubMed Abstract: 
  • The three-dimensional structure of the bifunctional alpha-amylase/trypsin inhibitor (RBI) from seeds of ragi (Eleusine coracana Gaertneri) has been determined in solution using multidimensional 1H and 15N NMR spectroscopy. The inhibitor consists of 1 ...

    The three-dimensional structure of the bifunctional alpha-amylase/trypsin inhibitor (RBI) from seeds of ragi (Eleusine coracana Gaertneri) has been determined in solution using multidimensional 1H and 15N NMR spectroscopy. The inhibitor consists of 122 amino acids, with 5 disulfide bridges, and belongs to the plant alpha-amylase/trypsin inhibitor family for which no three-dimensional structures have yet been available. The structure of the inhibitor was determined on the basis of 1131 interresidue interproton distance constraints derived from nuclear Overhauser enhancement measurements and 52 phi angles, supplemented by 9 psi and 51 chi 1 angles. RBI consists of a globular four-helix motif with a simple "up-and-down" topology. The helices are between residues 18-29, 37-51, 58-65, and 87-94. A fragment from Val 67 to Ser 69 and Gln 73 to Glu 75 forms an antiparallel beta-sheet. The fold of RBI represents a new motif among the serine proteinase inhibitors. The trypsin binding loop of RBI adopts the "canonical", substrate-like conformation which is highly conserved among serine proteinase inhibitors. The binding loop is stabilized by the two adjacent alpha-helices 1 and 2. This motif is also novel and not found in known structures of serine proteinase inhibitors. The three-dimensional structure of RBI together with biochemical data suggests the location of the alpha-amylase binding site on the face of the molecule opposite to the site of the trypsin binding loop. The RBI fold should be general for all members of the RBI family because conserved residues among the members of the family from the core of the structure.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

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

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 20 
  • Olderado: 1BIP Olderado
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORrefinement
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-07-10
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other