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 
  • R-Value Observed: 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

  • DOI: 10.1016/s0969-2126(97)00296-7
  • Primary Citation of Related Structures:  
    1AN1

  • 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, tryptase is fully active in plasma and in the extracellular space, as there are no known natural inhibitors of tryptase in humans ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TRYPSINA [auth E]223Sus scrofaMutation(s): 1 
EC: 3.4.21.4
UniProt
Find proteins for P00761 (Sus scrofa)
Explore P00761 
Go to UniProtKB:  P00761
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
TRYPTASE INHIBITORB [auth I]46Hirudo medicinalisMutation(s): 0 
EC: 3.4.21.4
UniProt
Find proteins for P80424 (Hirudo medicinalis)
Explore P80424 
Go to UniProtKB:  P80424
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download Ideal Coordinates CCD File 
C [auth E]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.170 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.7α = 90
b = 63.7β = 90
c = 130.86γ = 90
Software Package:
Software NamePurpose
XDSdata scaling
MARSCALEdata reduction
AMoREphasing
X-PLORrefinement
XDSdata reduction
MARSCALEdata scaling

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

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