3AFG

Crystal structure of ProN-Tk-SP from Thermococcus kodakaraensis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.184 

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This is version 1.1 of the entry. See complete history


Literature

Crystal structure of a subtilisin homologue, Tk-SP, from Thermococcus kodakaraensis: requirement of a C-terminal beta-jelly roll domain for hyperstability.

Foophow, T.Tanaka, S.Angkawidjaja, C.Koga, Y.Takano, K.Kanaya, S.

(2010) J Mol Biol 400: 865-877

  • DOI: 10.1016/j.jmb.2010.05.064
  • Primary Citation of Related Structures:  
    3AFG

  • PubMed Abstract: 
  • Tk-SP is a hyperthermostable subtilisin-like serine protease from Thermococcus kodakaraensis and is autoprocessed from its precursor (Pro-Tk-SP) with N- and C-propeptides. The crystal structure of the active-site mutant of Pro-Tk-SP lacking C-propeptide, ProN-Tk-S359A, was determined at 2 ...

    Tk-SP is a hyperthermostable subtilisin-like serine protease from Thermococcus kodakaraensis and is autoprocessed from its precursor (Pro-Tk-SP) with N- and C-propeptides. The crystal structure of the active-site mutant of Pro-Tk-SP lacking C-propeptide, ProN-Tk-S359A, was determined at 2.0 A resolution. ProN-Tk-S359A consists of the N-propeptide, subtilisin, and beta-jelly roll domains. Two Ca(2+) ions bind to the beta-jelly roll domain. The overall structure of ProN-Tk-S359A without the beta-jelly roll domain is similar to that of the bacterial propeptide:subtilisin complex, except that it does not contain Ca(2+) ions. To analyze the role of the beta-jelly roll domain of Tk-SP, we constructed a series of the active-site mutants of Tk-SP with (Tk-S359A/C) and without (Tk-S359A/CDeltaJ) beta-jelly roll domain. Both Tk-S359C and Tk-S359CDeltaJ exhibited protease activities in gel assay, indicating that the beta-jelly roll domain is not required for folding or activity. However, the T(m) value of Tk-S359ADeltaJ determined by far-UV CD spectroscopy in the presence of 10-mM CaCl(2) was lower than that of Tk-S359A by 29.4 degrees C. The T(m) value of Tk-S359A was decreased by 29.5 degrees C by the treatment with 10 mM ethylenediaminetetraacetic acid, indicating that the beta-jelly roll domain contributes to the stabilization of Tk-S359A only in a Ca(2+)-bound form. Tk-SP highly resembles subtilisin-like serine proteases from Pyrococcus furiosus, Thermococcus gammatolerans, and Thermococcus onnurineus in size and amino acid sequence. We propose that attachment of a beta-jelly roll domain to the C-terminus is one of the strategies of the proteins from hyperthermophiles to adapt to high-temperature environment.


    Organizational Affiliation

    Department of Material and Life Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Subtilisin-like serine proteaseA, B539Thermococcus kodakarensisMutation(s): 1 
Gene Names: TK1689
EC: 3.4.21.62
Find proteins for Q5JIZ5 (Thermococcus kodakarensis (strain ATCC BAA-918 / JCM 12380 / KOD1))
Explore Q5JIZ5 
Go to UniProtKB:  Q5JIZ5
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.184 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.009α = 90
b = 123.996β = 90
c = 141.037γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
MOLREPphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-08-04
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance