1BHU

THE 3D STRUCTURE OF THE STREPTOMYCES METALLOPROTEINASE INHIBITOR, SMPI, ISOLATED FROM STREPTOMYCES NIGRESCENS TK-23, NMR, MINIMIZED AVERAGE STRUCTURE


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 60 
  • Conformers Submitted: 
  • Selection Criteria: LEAST VIOLATION 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

NMR structure of the Streptomyces metalloproteinase inhibitor, SMPI, isolated from Streptomyces nigrescens TK-23: another example of an ancestral beta gamma-crystallin precursor structure.

Ohno, A.Tate, S.Seeram, S.S.Hiraga, K.Swindells, M.B.Oda, K.Kainosho, M.

(1998) J.Mol.Biol. 282: 421-433


  • PubMed Abstract: 
  • The Streptomyces metalloproteinase inhibitor, SMPI, isolated from Streptomyces nigrescens TK-23, is a proteinaceous metalloproteinase inhibitor, and consists of 102 amino acid residues with two disulfide bridges. SMPI specifically inhibits metallopro ...

    The Streptomyces metalloproteinase inhibitor, SMPI, isolated from Streptomyces nigrescens TK-23, is a proteinaceous metalloproteinase inhibitor, and consists of 102 amino acid residues with two disulfide bridges. SMPI specifically inhibits metalloproteinases such as thermolysin. In the present work, the solution structure of SMPI was determined on the basis of 1536 nuclear Overhauser enhancement derived distance restraints and 52 dihedral angle restraints obtained from three-bond spin coupling constants. The final ensemble of 20 NMR structures overlaid onto their mean coordinate with backbone (N, Calpha, C') r.m.s.d. values of 0. 45(+/-0.11) A and 0.57(+/-0.18) A for residues 6 to 99 and the entire 102 residues, respectively. SMPI is essentially composed of two beta-sheets, each consisting of four antiparallel beta-strands. The structure can be considered as two Greek key motifs with 2-fold internal symmetry, a Greek key beta-barrel. One unique structural feature found in SMPI is in its extension between the first and second strands of the second Greek key motif. Interestingly, this extended segment is known to be involved in the inhibitory activity of SMPI. In the absence of sequence similarity, the SMPI structure shows clear similarity to both domains of the eye lens crystallins, both domains of the calcium sensor protein-S, as well as the single-domain yeast killer toxin. The yeast killer toxin structure was thought to be a precursor of the two-domain beta gamma-crystallin proteins, because of its structural similarity to each domain of the beta gamma-crystallins. SMPI thus provides another example of a single-domain protein structure that corresponds to the ancestral fold from which the two-domain proteins in the beta gamma-crystallin superfamily are believed to have evolved.


    Related Citations: 
    • Elucidation of the Mode of Interaction of Thermolysin with a Proteinaceous Metalloproteinase Inhibitor, Smpi, Based on a Model Complex Structure and a Structural Dynamics Analysis
      Tate, S.,Ohno, A.,Seeram, S.S.,Hiraga, K.,Oda, K.,Kainosho, M.
      (1998) J.Mol.Biol. 282: 435


    Organizational Affiliation

    Faculty of Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Tokyo, Hachioji, 192-0397, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
METALLOPROTEINASE INHIBITOR
A
102Streptomyces nigrescensMutation(s): 0 
Gene Names: smpI
Find proteins for P01077 (Streptomyces nigrescens)
Go to UniProtKB:  P01077
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 60 
  • Conformers Submitted: 
  • Selection Criteria: LEAST VIOLATION 
Software Package:
Software NamePurpose
X-PLORrefinement
X-PLORmodel building
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-01-06
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance