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Author Spotlight: Exploring Cellular Zinc Regulation Through ZnT1 Functionality
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Chelatable trace zinc causes low, irreproducible KDAC8 activity.

Tasha B Toro1, Samantha A Edenfield1, Brandon J Hylton1

  • 1Department of Chemistry, Xavier University of Louisiana, 1 Drexel Dr., New Orleans, LA 70125-1098, USA.

Analytical Biochemistry
|November 5, 2017
PubMed
Summary

Trace zinc in buffers inhibits lysine deacetylase KDAC8, causing inconsistent results. Adding chelators or using phosphate buffers resolves this, enabling reliable enzyme activity assays for identifying KDAC8 substrates and modulators.

Keywords:
HDAC8Histone deacetylaseLysine deacetylaseZinc

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Acetylation is a key cellular regulatory post-translational modification.
  • Lysine deacetylase KDAC8 activity assays show inconsistent in vitro results, hindering research.
  • Trace zinc contamination in reagents is a potential cause of KDAC8 inhibition.

Purpose of the Study:

  • To investigate the cause of variable KDAC8 in vitro activity.
  • To identify conditions that improve KDAC8 enzyme activity and assay reproducibility.
  • To provide optimized assay conditions for KDAC8 substrate and modulator discovery.

Main Methods:

  • Detection of trace zinc levels in buffer reagents.
  • Testing the inhibitory effect of zinc on KDAC8 activity.
  • Evaluating the efficacy of chelators (BSA, EDTA, citrate) and buffer systems (phosphate vs. Tris) in mitigating zinc inhibition.
  • Assessing enzyme activity and reproducibility under optimized conditions.

Main Results:

  • Trace zinc, even at low concentrations, significantly inhibits KDAC8 activity.
  • Chelators and phosphate-based buffers effectively eliminate zinc-induced inhibition.
  • Optimized conditions lead to high and consistent KDAC8 activity, independent of enzyme concentration.
  • Reproducible assay conditions were established for KDAC8.

Conclusions:

  • Trace zinc contamination is a primary cause of inconsistent KDAC8 activity.
  • Optimized buffer systems and the use of chelators are crucial for reliable KDAC8 assays.
  • These findings facilitate accurate identification of KDAC8 substrates and small molecule modulators.
  • Improved assay conditions enhance the interpretation of existing and future KDAC8 research data.