1K9O

CRYSTAL STRUCTURE OF MICHAELIS SERPIN-TRYPSIN COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.158 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The structure of a Michaelis serpin-protease complex.

Ye, S.Cech, A.L.Belmares, R.Bergstrom, R.C.Tong, Y.Corey, D.R.Kanost, M.R.Goldsmith, E.J.

(2001) Nat.Struct.Mol.Biol. 8: 979-983

  • DOI: 10.1038/nsb1101-979
  • Primary Citation of Related Structures:  1I99

  • PubMed Abstract: 
  • Serine protease inhibitors (serpins) regulate the activities of circulating proteases. Serpins inhibit proteases by acylating the serine hydroxyl at their active sites. Before deacylation and complete proteolysis of the serpin can occur, massive conf ...

    Serine protease inhibitors (serpins) regulate the activities of circulating proteases. Serpins inhibit proteases by acylating the serine hydroxyl at their active sites. Before deacylation and complete proteolysis of the serpin can occur, massive conformational changes are triggered in the serpin while maintaining the covalent linkage between the protease and serpin. Here we report the structure of a serpin-trypsin Michaelis complex, which we visualized by using the S195A trypsin mutant to prevent covalent complex formation. This encounter complex reveals a more extensive interaction surface than that present in small inhibitor-protease complexes and is a template for modeling other serpin-protease pairs. Mutations of several serpin residues at the interface reduced the inhibitory activity of the serpin. The serine residue C-terminal to the scissile peptide bond is found in a closer than usual interaction with His 57 at the active site of trypsin.


    Organizational Affiliation

    Department of Biochemistry, The University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ALASERPIN
I
378Manduca sextaN/A
Find proteins for P14754 (Manduca sexta)
Go to UniProtKB:  P14754
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
TRYPSIN II ANIONIC
E
223Rattus norvegicusGene Names: Prss2 (Try2)
EC: 3.4.21.4
Find proteins for P00763 (Rattus norvegicus)
Go to UniProtKB:  P00763
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.158 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 112.572α = 90.00
b = 112.572β = 90.00
c = 95.955γ = 120.00
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-11-21
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance