1AN1

LEECH-DERIVED TRYPTASE INHIBITOR/TRYPSIN COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.170 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the complex of leech-derived tryptase inhibitor (LDTI) with trypsin and modeling of the LDTI-tryptase system.

Di Marco, S.Priestle, J.P.

(1997) Structure 5: 1465-1474


  • PubMed Abstract: 
  • Tryptase is a trypsin-like serine proteinase stored in the cytoplasmic granules of mast cells, which has been implicated in a number of mast cell related disorders such as asthma and rheumatoid arthritis. Unlike almost all other serine proteinases, t ...

    Tryptase is a trypsin-like serine proteinase stored in the cytoplasmic granules of mast cells, which has been implicated in a number of mast cell related disorders such as asthma and rheumatoid arthritis. Unlike almost all other serine proteinases, tryptase is fully active in plasma and in the extracellular space, as there are no known natural inhibitors of tryptase in humans. Leech-derived tryptase inhibitor (LDTI), a protein of 46 amino acids, is the first molecule found to bind tightly to and specifically inhibit human tryptase in the nanomolar range. LDTI also inhibits trypsin and chymotrypsin with similar affinities. The structure of LDTI in complex with an inhibited proteinase could be used as a template for the development of low molecular weight tryptase inhibitors.


    Related Citations: 
    • Purification, Characterization and Biological Evaluation of Recombinant Leech-Derived Tryptase Inhibitor (Rldti) Expressed at High Level in the Yeast Saccharomyces Cerevisiae
      Pohlig, G.,Fendrich, G.,Knecht, R.,Eder, B.,Piechottka, G.,Sommerhoff, C.P.,Heim, J.
      (1996) Eur.J.Biochem. 241: 619
    • A Kazal-Type Inhibitor of Human Mast Cell Tryptase: Isolation from the Medical Leech Hirudo Medicinalis, Characterization, and Sequence Analysis
      Sommerhoff, C.P.,Sollner, C.,Mentele, R.,Piechottka, G.P.,Auerswald, E.A.,Fritz, H.
      (1994) Biol.Chem.Hoppe-Seyler 375: 685


    Organizational Affiliation

    Istituto di Ricerche di Biologia Molecolare "P. Angeletti" (IRBM), Via Pontina Km 30,600, 00040 Pomezia, Rome, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRYPSIN
E
223Sus scrofaMutation(s): 0 
EC: 3.4.21.4
Find proteins for P00761 (Sus scrofa)
Go to UniProtKB:  P00761
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
TRYPTASE INHIBITOR
I
46Hirudo medicinalisMutation(s): 0 
Find proteins for P80424 (Hirudo medicinalis)
Go to UniProtKB:  P80424
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
E
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
DAS
Query on DAS
E
D-PEPTIDE LINKINGC4 H7 N O4

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.170 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 63.700α = 90.00
b = 63.700β = 90.00
c = 130.860γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
X-PLORrefinement
MARSCALEdata scaling
XDSdata scaling
MARSCALEdata reduction
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-07-01
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance