HDAC1 Substrate Profiling Using Proteomics-Based Substrate Trapping

Area of Science:

• Biochemistry
• Molecular Biology
• Cancer Research

Background:

• Histone deacetylase (HDAC) proteins are crucial regulators of cellular processes and are implicated in diseases like cancer.
• While many acetylated proteins are known, the specific HDACs responsible for their deacetylation, particularly for HDAC1, remain poorly understood.
• Existing tools for identifying HDAC substrates are limited, hindering research into HDAC1 function.

Purpose of the Study:

• To develop and apply an improved mutant trapping strategy coupled with mass spectrometry (MS) for efficient identification of HDAC1 substrates.
• To uncover novel biological functions of HDAC1 beyond its known epigenetic roles.

Main Methods:

• Utilized an improved mutant trapping strategy to capture HDAC1-substrate interactions.
• Employed mass spectrometry (MS)-based proteomics to simultaneously identify multiple potential HDAC1 substrates.
• Validated identified hits as likely HDAC1 substrates.

Main Results:

• Successfully identified multiple novel substrates of HDAC1, including CDK1, AIFM1, MSH6, and RuvB-like 1.
• These substrates are involved in diverse cellular processes, indicating broader roles for HDAC1.
• Demonstrated the efficiency of substrate trapping combined with MS proteomics for HDAC1 substrate discovery.

Conclusions:

• The improved trapping method provides an efficient means to identify HDAC1 substrates.
• Newly identified substrates suggest novel, non-epigenetic functions for HDAC1.
• This approach facilitates a comprehensive understanding of HDAC function in health and disease states.