1A0L

HUMAN BETA-TRYPTASE: A RING-LIKE TETRAMER WITH ACTIVE SITES FACING A CENTRAL PORE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Human beta-tryptase is a ring-like tetramer with active sites facing a central pore.

Pereira, P.J.Bergner, A.Macedo-Ribeiro, S.Huber, R.Matschiner, G.Fritz, H.Sommerhoff, C.P.Bode, W.

(1998) Nature 392: 306-311

  • DOI: 10.1038/32703

  • PubMed Abstract: 
  • Human tryptase, a mast-cell-specific serine proteinase that may be involved in causing asthma and other allergic and inflammatory disorders, is unique in two respects: it is enzymatically active only as a heparin-stabilized tetramer, and it is resist ...

    Human tryptase, a mast-cell-specific serine proteinase that may be involved in causing asthma and other allergic and inflammatory disorders, is unique in two respects: it is enzymatically active only as a heparin-stabilized tetramer, and it is resistant to all known endogenous proteinase inhibitors. The 3-A crystal structure of human beta-tryptase in a complex with 4-amidinophenyl pyruvic acid shows four quasi-equivalent monomers arranged in a square flat ring of pseudo 222 symmetry. Each monomer contacts its neighbours at two different interfaces through six loop segments. These loops are located around the active site of beta-tryptase and differ considerably in length and conformation from loops of other trypsin-like proteinases. The four active centres of the tetramer are directed towards an oval central pore, restricting access for macromolecular substrates and enzyme inhibitors. Heparin chains might stabilize the complex by binding to an elongated patch of positively charged residues spanning two adjacent monomers. The nature of this unique tetrameric architecture explains many of tryptase's biochemical properties and provides a basis for the rational design of monofunctional and bifunctional tryptase inhibitors.


    Organizational Affiliation

    Abteilung für Strukturforschung, Max-Planck-Institut für Biochemie, Martinsried, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BETA-TRYPTASE
A, B, C, D
244Homo sapiensGene Names: TPSB2 (TPS2)
EC: 3.4.21.59
Find proteins for P20231 (Homo sapiens)
Go to Gene View: TPSB2
Go to UniProtKB:  P20231
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
APA
Query on APA

Download SDF File 
Download CCD File 
A, B, C, D
(2S)-3-(4-carbamimidoylphenyl)-2-hydroxypropanoic acid
C10 H12 N2 O3
FAFAPKBWTCDDJC-QMMMGPOBSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.197 
  • Space Group: P 41
Unit Cell:
Length (Å)Angle (°)
a = 82.930α = 90.00
b = 82.930β = 90.00
c = 172.860γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
X-PLORphasing
X-PLORmodel building
SCALEPACKdata scaling
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-03-23
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance