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Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...

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Protein structure modeling indicates hexahistidine-tag interference with enzyme activity.

Anna-Carolin Freydank1, Wolfgang Brandt, Birgit Dräger

  • 1Faculty of Science I, Institute of Pharmacy, Martin-Luther University Halle-Wittenberg, Hoher Weg 8, D-06120 Halle/Saale, Germany.

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Hexahistidine affinity tags can impair enzyme function, particularly when attached to the C-terminus. Protein modeling is recommended before expressing tagged enzymes to predict potential active site interference.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Structural Biology

Background:

  • Tropinone reductase is an enzyme belonging to the short-chain dehydrogenase family.
  • Unusual kinetic properties were observed, suggesting a potential influence of the hexahistidine affinity tag.

Purpose of the Study:

  • To investigate the impact of a hexahistidine affinity tag on the catalytic properties of tropinone reductase.
  • To compare the effects of N-terminal versus C-terminal tagging on enzyme function.

Main Methods:

  • Enzyme purification and kinetic characterization of tagged tropinone reductase from Solanum dulcamara.
  • Protein modeling to predict potential interactions between the affinity tag and the enzyme's active site.

Main Results:

  • The C-terminally tagged tropinone reductase exhibited impaired function compared to the N-terminally tagged form.
  • Protein modeling suggested that the C-terminal hexahistidine tag can sterically or electrostatically interfere with the enzyme's active site.

Conclusions:

  • The position of the hexahistidine affinity tag significantly affects tropinone reductase activity.
  • Affinity tag placement can influence enzyme function through interactions with the active site.
  • Protein modeling should be utilized prior to enzyme expression with affinity tags to anticipate and mitigate potential functional impairments.