1BSP

THERMOSTABLE THYMIDYLATE SYNTHASE A FROM BACILLUS SUBTILIS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structures of a unique thermal-stable thymidylate synthase from Bacillus subtilis.

Stout, T.J.Schellenberger, U.Santi, D.V.Stroud, R.M.

(1998) Biochemistry 37: 14736-14747

  • DOI: 10.1021/bi981270l
  • Primary Citation of Related Structures:  1BKO, 1BKP, 1BSF

  • PubMed Abstract: 
  • Unlike all other organisms studied to date, Bacillus subtilis expresses two different thymidylate synthases: bsTS-A and bsTS-B. bsTS-A displays enhanced enzymatic and structural thermal stability uncharacteristic of most TSs. Despite the high level o ...

    Unlike all other organisms studied to date, Bacillus subtilis expresses two different thymidylate synthases: bsTS-A and bsTS-B. bsTS-A displays enhanced enzymatic and structural thermal stability uncharacteristic of most TSs. Despite the high level of TS conservation across most species, bsTS-A shares low sequence identity (<40%) with the majority of TSs from other organisms. This TS and the TSs from Lactococcus lactis and phage Phi3T-to which it is most similar-have been of interest for some time since, by structure-based sequence alignment, they appear to lack several key residues shown by mutagenesis to be essential to enzymatic function [Greene, P. J., Yu, P. L., Zhao, J., Schiffer, C. A., and Santi, D. (1994) Protein Sci. 3, 1114-6]. In addition, bsTS-A demonstrates specific activity 2-3-fold higher than TS from Lactobacillus casei or Escherichia coli. We have solved the crystal structure of this unusual TS in four crystal forms to a maximum resolution of 1.7 A. Each of these crystal forms contains either one or two noncrystallographically related dimers. Stabilization of the beta-sheet dimer interface through a dramatic architecture of buttressed internal salt bridges maintains the structural integrity of bsTS-A at elevated temperatures. Melting curves of TSs from L. casei and E. coli are compared to that of TS-A from B. subtilis and correlated with numbers of hydrogen bonds, salt bridges, and the numbers of interactions localized to the dimer interface. Analysis of this structure will shed light on the conservation of function across diversity of sequence, as well as provide insights into the thermal stabilization of a highly conserved enzyme.


    Related Citations: 
    • Two Thymidylate Synthetases in Bacillus Subtilis
      Neuhard, J.,Price, A.R.,Schack, L.,Thomassen, E.
      (1978) Proc.Natl.Acad.Sci.USA 75: 1194
    • Expression, Purification, and Characterization of Thymidylate Synthase from Lactococcus Lactis
      Greene, P.J.,Yu, P.L.,Zhao, J.,Schiffer, C.A.,Santi, D.
      (1994) Protein Sci. 3: 1114


    Organizational Affiliation

    Department of Biochemistry, School of Medicine, University of California, San Francisco 94143-0448, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
THYMIDYLATE SYNTHASE A
A, B
278Bacillus subtilis (strain 168)Gene Names: thyA1
EC: 2.1.1.45
Find proteins for P0CI79 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P0CI79
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.181 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 57.223α = 90.00
b = 97.438β = 90.00
c = 118.019γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
X-PLORphasing
X-PLORmodel building
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-02-16
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance