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Thioredoxin system from Deinococcus radiodurans.

Josiah Obiero1, Vanessa Pittet, Sara A Bonderoff

  • 1Department of Chemistry, University of Saskatchewan, Saskatoon S7N 5C9, Canada.

Journal of Bacteriology
|November 26, 2009
PubMed
Summary
This summary is machine-generated.

This study characterizes thioredoxin (Trx) and thioredoxin reductase (TrxR) from Deinococcus radiodurans, revealing structural similarities to E. coli TrxR. The findings clarify D. radiodurans TrxR

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Microbiology

Background:

  • The thioredoxin system is crucial for cellular redox balance.
  • Deinococcus radiodurans exhibits remarkable resistance to ionizing radiation.
  • Understanding its redox machinery may offer insights into radiation tolerance.

Purpose of the Study:

  • To clone, purify, and characterize thioredoxin (Trx) and thioredoxin reductase (TrxR) from D. radiodurans.
  • To determine the crystal structure of D. radiodurans TrxR.
  • To investigate the enzymatic activity and cofactor specificity of D. radiodurans TrxR.

Main Methods:

  • Polymerase chain reaction (PCR) amplification of Trx and TrxR genes.
  • Overexpression in Escherichia coli and purification via metal affinity chromatography.
  • Enzymatic assays (insulin precipitation, DTNB reduction) and X-ray crystallography (1.9-Å resolution).

Main Results:

  • D. radiodurans Trx and TrxR were successfully cloned, expressed, and purified.
  • The crystal structure of oxidized TrxR revealed similarity to E. coli TrxR, with canonical nucleotide-binding folds.
  • D. radiodurans TrxR showed a higher K(m) for its cognate Trx compared to the E. coli system and poor affinity for E. coli Trx.
  • D. radiodurans TrxR utilizes only NADPH, not NADH.

Conclusions:

  • The structural and functional characterization of D. radiodurans Trx and TrxR provides a molecular basis for their roles in this radiation-resistant bacterium.
  • Differences in substrate binding affinity suggest specific interactions within the D. radiodurans thioredoxin system.
  • The exclusive use of NADPH by D. radiodurans TrxR clarifies its cofactor preference.