1KUF

High-resolution Crystal Structure of a Snake Venom Metalloproteinase from Taiwan Habu


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.35 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The 1.35 A structure of cadmium-substituted TM-3, a snake-venom metalloproteinase from Taiwan habu: elucidation of a TNFalpha-converting enzyme-like active-site structure with a distorted octahedral geometry of cadmium.

Huang, K.F.Chiou, S.H.Ko, T.P.Yuann, J.M.Wang, A.H.

(2002) Acta Crystallogr.,Sect.D 58: 1118-1128


  • PubMed Abstract: 
  • The crystal structure of TM-3, a small snake-venom metalloproteinase (SVMP) isolated from Taiwan habu (Trimeresurus mucrosquamatus), was determined at 1.35 A resolution with resultant R and R(free) values of 0.181 and 0.204, respectively. The overall ...

    The crystal structure of TM-3, a small snake-venom metalloproteinase (SVMP) isolated from Taiwan habu (Trimeresurus mucrosquamatus), was determined at 1.35 A resolution with resultant R and R(free) values of 0.181 and 0.204, respectively. The overall structure of TM-3 is an oblate ellipsoid that contains three disulfide crosslinks, Cys118-Cys197, Cys159-Cys181 and Cys161-Cys164. It exhibits the typical structural features of SVMPs and is closely related to the structure of the catalytic proteinase domain of TNFalpha-converting enzyme (TACE). In the present structure, the essential catalytic zinc ion was found to be replaced by a cadmium ion during crystallization, as revealed by atomic absorption analysis and X-ray data. This cadmium ion is bound to six ligands, including three conserved histidines and three water molecules, displaying the coordination geometry of a distorted octahedron. One of the water molecules is proposed to play the role of stabilizing the tetrahedral intermediate during the catalysis of SVMPs. The putative S'(1) specificity pocket of TM-3 is relatively shallow, in contrast to the deep pockets of adamalysin II, atrolysin C and H(2)-proteinase, but is similar to those in acutolysin A and TACE. The shallow pocket is a consequence of the presence of the non-conserved disulfide bond Cys159-Cys181 and the residue Gln174 at the bottom of the S'(1) pocket. The results indicate that the active-site structure of TM-3, among the know structures of SVMPs examined thus far, is most similar to that of TACE owing to their close disulfide configurations and the S'(1) specificity pocket.


    Related Citations: 
    • Characterization of multiple metalloproteinases with fibrinogenolytic activity from the venom of Taiwan habu (Trimeresurus mucrosquamatus): protein microsequencing coupled with cDNA sequence analysis.
      Huang, K.F.,Hung, C.C.,Pan, F.M.,Chow, L.P.,Tsugita, A.,Chiou, S.H.
      (1995) Biochem.Biophys.Res.Commun. 216: 223


    Organizational Affiliation

    Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
metalloproteinase
A
203Protobothrops mucrosquamatusMutation(s): 0 
Find proteins for O57413 (Protobothrops mucrosquamatus)
Go to UniProtKB:  O57413
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CD
Query on CD

Download SDF File 
Download CCD File 
A
CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.35 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.181 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 60.991α = 90.00
b = 60.991β = 90.00
c = 128.398γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSrefinement
AMoREphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-07-03
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance