Genetically Encoded Fluorescent and Bioluminescent Probes for HDAC8

Area of Science:

• Biochemistry
• Molecular Biology
• Chemical Biology

Background:

• Protein lysine deacetylases are crucial enzymes involved in various cellular processes.
• Existing genetically encoded probes effectively detect sirtuins but fail to respond to zinc-dependent histone deacetylases (HDACs).
• There is a need for novel probes capable of specifically detecting HDACs.

Purpose of the Study:

• To develop novel fluorescent and bioluminescent probes for the specific detection of histone deacetylase 8 (HDAC8).
• To create probes that are responsive to HDACs, overcoming the limitations of existing sirtuin-specific probes.
• To facilitate biological investigation of HDAC8 and other HDACs, and to aid in the discovery of new HDAC inhibitors.

Main Methods:

• Genetically encoded acetyl lysine (AcK) was replaced with trifluoroacetyl lysine (TfAcK) in probe design.
• Fluorescent and bioluminescent probes were constructed using the modified lysine analog.
• Probe specificity and responsiveness were validated using recombinantly expressed HDAC8 in E. coli and endogenous HDACs in mammalian cells.

Main Results:

• The newly designed probes demonstrated specific responsiveness to HDAC8.
• The probes were effective in detecting endogenous HDACs within mammalian cells.
• The modified probes successfully addressed the lack of responsiveness to Zn2+-dependent HDACs seen in previous designs.

Conclusions:

• The developed TfAcK-based probes offer a specific and sensitive method for detecting HDAC8 and potentially other HDACs.
• These probes represent a valuable tool for advancing the biological study of HDACs.
• The innovative probe design holds promise for the discovery of novel HDAC inhibitors.