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UvrC Coordinates an O2-Sensitive [4Fe4S] Cofactor.

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Researchers investigated the [4Fe4S] cluster in UvrC, a DNA repair enzyme. They found this iron-sulfur cluster is crucial for UvrC

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Bioinorganic Chemistry

Background:

  • [4Fe4S] clusters are vital cofactors in enzymes across all life domains.
  • Observing these clusters in nucleic acid processing enzymes is difficult due to weak signatures and cofactor lability.
  • UvrC, a bacterial nucleotide excision repair (NER) endonuclease, was investigated for [4Fe4S] cluster involvement.

Purpose of the Study:

  • To investigate the presence and role of a [4Fe4S] cluster in the UvrC enzyme.
  • To characterize the cofactor's stability and its impact on UvrC's DNA binding affinity and function.
  • To determine the redox activity of the [4Fe4S] cluster within UvrC.

Main Methods:

  • Sequence alignments and anaerobic purification techniques.
  • Iron quantification, UV-visible, and electron paramagnetic resonance (EPR) spectroscopies.
  • DNA binding assays and DNA electrochemistry.

Main Results:

  • UvrC exhibits characteristics consistent with [4Fe4S] cluster coordination (60-70% incorporation).
  • The [4Fe4S] cluster in UvrC is susceptible to oxidative degradation.
  • Holo-UvrC displays high-affinity DNA binding (80-100 nM) compared to apo-UvrC.
  • The [4Fe4S] cluster is redox-active and participates in DNA-mediated charge transport (midpoint potential of 90 mV vs NHE).

Conclusions:

  • The [4Fe4S] cluster is critical for UvrC function, enhancing its DNA binding affinity.
  • The cofactor's redox activity suggests a role in DNA repair mechanisms beyond simple binding.
  • Understanding the [4Fe4S] cluster in UvrC provides insights into DNA repair pathways and metalloenzyme function.