1IC6

STRUCTURE OF A SERINE PROTEASE PROTEINASE K FROM TRITIRACHIUM ALBUM LIMBER AT 0.98 A RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.98 Å
  • R-Value Free: 0.124 
  • R-Value Work: 0.114 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of a serine protease proteinase K from Tritirachium album limber at 0.98 A resolution.

Betzel, C.Gourinath, S.Kumar, P.Kaur, P.Perbandt, M.Eschenburg, S.Singh, T.P.

(2001) Biochemistry 40: 3080-3088


  • PubMed Abstract: 
  • X-ray diffraction data at atomic resolution to 0.98 A with 136 380 observed unique reflections were collected using a high quality proteinase K crystals grown under microgravity conditions and cryocooled. The structure has been refined anisotropicall ...

    X-ray diffraction data at atomic resolution to 0.98 A with 136 380 observed unique reflections were collected using a high quality proteinase K crystals grown under microgravity conditions and cryocooled. The structure has been refined anisotropically with REFMAC and SHELX-97 with R-factors of 11.4 and 12.8%, and R(free)-factors of 12.4 and 13.5%, respectively. The refined model coordinates have an overall rms shifts of 0.23 A relative to the same structure determined at room temperature at 1.5 A resolution. Several regions of the main chain and the side chains, which were not observed earlier have been seen more clearly. For example, amino acid 207, which was reported earlier as Ser has been clearly identified as Asp. Furthermore, side-chain disorders of 8 of 279 residues in the polypeptide have been identified. Hydrogen atoms appear as significant peaks in the F(o) - F(c) difference electron density map accounting for an estimated 46% of all hydrogen atoms at 2sigma level. Furthermore, the carbon, nitrogen, and oxygen atoms can be differentiated clearly in the electron density maps. Hydrogen bonds are clearly identified in the serine protease catalytic triad (Ser-His-Asp). Furthermore, electron density is observed for an unusual, short hydrogen bond between aspartic acid and histidine in the catalytic triad. The short hydrogen bond, designated "catalytic hydrogen bond", occurs as part of an elaborate hydrogen bond network, involving Asp of the catalytic triad. Though unusual, these features seem to be conserved in other serine proteases. Finally there are clear electron density peaks for the hydrogen atoms associated with the Ogamma of Ser 224 and Ndelta1 of His 69.


    Organizational Affiliation

    Institute of Medical Biochemistry and Molecular Biology, UKE, c/o DESY, Building 22a, Notkestrasse 85, 22603 Hamburg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEINASE K
A
279Engyodontium albumGene Names: PROK
EC: 3.4.21.64
Find proteins for P06873 (Engyodontium album)
Go to UniProtKB:  P06873
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
NO3
Query on NO3

Download SDF File 
Download CCD File 
A
NITRATE ION
N O3
NHNBFGGVMKEFGY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.98 Å
  • R-Value Free: 0.124 
  • R-Value Work: 0.114 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 67.288α = 90.00
b = 67.288β = 90.00
c = 106.582γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
REFMACrefinement
AMoREphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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