New knowledge about the mechanism of specific protein complexes in the body could help in the development of better drugs for the treatment of diseases such as cancer and Alzheimer's.
This is according to new research led by Professor John Schwabe and his team at the University of Leicester, which have focused their work on understanding the structure and function of large protein complexes in the body that are involved in the regulation of gene expression called co-repressor complexes.
These complexes contain histone deacetylase (HDAC) enzymes, which alter how DNA is packaged within cells.
HDACs are implicated in many different diseases from cancer to Alzheimer's--and several drugs are in clinical use for the treatment of different types of lymphoma and myeloma.
In a new paper published this week in the journal Nature Communications, the research team has developed a new peptide-based inhibitor and gained insights into how the enzymes are activated by the small molecule inositol phosphate.
Professor Schwabe explained: “Previously our team had discovered that the activity of the enzymes in co-repressor complexes is regulated by a small molecule called inositol phosphate. We wished to further understand the mechanism of enzyme activation by inositol phosphates and how substrate is recognised.
“This work provides fundamental basic insights into the HDAC enzymes and may provide the basis for the development of drugs that are more specific and efficient. Ultimately, a greater understanding of how these enzymes work and how substrate interacts may lead to the development of better drugs.”
Working with collaborators from the University of Leicester's Department of Chemistry and researchers at the University of Bath, the team synthesised a number of unique tool compounds that allowed them to investigate how inositol phosphates and substrate bind to co-repressor complexes.
They were then able to work out the specific features of inositol phosphates and how they bind to activate the HDAC enzyme. They went on to solve the crystal structure of a novel peptide inhibitor, which is based upon the enzymes’ substrate, in complex with HDAC1: co-repressor.
This not only gave the researchers insights into how substrate interacts with the enzyme, but could also help to improve drug treatments for a variety of health issues, according to the paper. Taken together, these results “have shed light on the mechanism of activation by inositol phosphates,” the authors noted.
- check out the paper