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The Human UGT2B7 Nanodisc.

Ian Cook1, Anna B Asenjo1, Hernando Sosa1

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Drug Metabolism and Disposition: the Biological Fate of Chemicals
|January 2, 2020
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Summary
This summary is machine-generated.

Researchers purified human UGT2B7 using nanodisc technology, overcoming a major hurdle in studying these essential drug-metabolizing enzymes. This breakthrough enables easier biochemical and biophysical investigations of uridine diphosphate glycosyl-transferases (UGTs).

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Area of Science:

  • Biochemistry
  • Enzymology
  • Membrane protein biochemistry

Background:

  • Human uridine diphosphate glycosyl-transferases (UGTs) are critical for metabolizing small molecules.
  • Studying UGTs biochemically and biophysically has been challenging due to difficulties in purifying these membrane-bound proteins.
  • This limitation has hindered research into their structure, function, and role in phase II metabolism.

Purpose of the Study:

  • To develop a method for purifying catalytically competent human UGTs.
  • To assemble and purify the first human UGT nanodisc complex, specifically UGT2B7•nanodisc.
  • To demonstrate the utility of nanodisc technology for studying UGTs.

Main Methods:

  • Cell-free expression system used for protein synthesis.
  • Nanodisc technology employed to solubilize and stabilize the membrane-bound UGT2B7.
  • Purification of the UGT2B7•nanodisc complex to homogeneity.

Main Results:

  • Successfully assembled and purified milligram quantities of the human UGT2B7•nanodisc complex.
  • The purified nanodisc complex was stable and exhibited initial-rate parameters identical to microsomal UGT2B7.
  • Each nanodisc was found to contain a single UGT2B7 monomer, simplifying assay complexities.

Conclusions:

  • Nanodisc technology provides a viable method to overcome purification challenges for human UGTs.
  • The purified UGT2B7•nanodisc is catalytically competent and suitable for biochemical and biophysical studies.
  • This approach is expected to facilitate broader research into the structure, function, and biology of UGTs in phase II metabolism.