Medicinal chemistry

Medicinal chemistry

Art of Science 3D sculpture
Developing new medicines is an important aspect of our disease research. Our medicinal chemistry team is working to improve the treatment of many significant diseases.

Our medicinal chemistry research

Our medicinal chemistry researchers aim to develop new medications to treat a variety of diseases including:

  • Cancer
  • Malaria
  • Inflammatory diseases such as rheumatoid arthritis
  • Neurodegeneration
  • Ischaemic and reperfusion injuries, which occur when the blood supply to a tissue is lost, and then reestablished such as occurs in in heart attack and stroke.

Our medicinal chemistry team works closely with many other researchers at the institute to advance the development of new treatments for disease, and to understand how diseases develop.

What is medicinal chemistry?

Medicinal chemistry refers to the discovery, design and production of new medicines.

Medicinal chemistry combines:

  • Biological understanding of the key proteins and processes contributing to a disease.
  • Organic chemistry knowledge to design, develop and synthesise the compounds that alter the disease-causing molecules.
  • Understanding how the body interacts with, and metabolises, small molecules, to obtain molecules that can be used as potential medicines.

What makes a medicine?

Many diseases can be traced to changes in how certain molecules, often proteins, function within cells. In many diseases, differences in cell signalling pathways exist between diseased cells and normal cells.

Targeted therapies are medicines that interact with a specific biological molecule, usually a protein. Targeted therapies can:

  • Stop a molecule from working, called inhibition, or
  • Encourage a molecule to work, called activation.

Many targeted therapies are ‘small molecules’, indicating the chemical’s size is much smaller than important biological molecules such as proteins or DNA.

There are many steps between finding a small molecule, or compound, that changes how a protein works, and it being available to treat people with a particular disease. Important features of potential medicines include:

  • Stability, so the compound does not rapidly degrade before it can be used.
  • Chemical properties including solubility and cell permeability, meaning the compound can travel through the body to diseased cells, and enter the cells.
  • Specificity, meaning that the compound does not influence other molecules unrelated to the disease.

When small molecules are developed that have the potential to treat disease, they must undergo rigorous testing before they enter clinical use. The processes of pre-clinical testing and clinical trials are explained on our Clinical Translation page.

From structure to medicine

Knowing the three dimensional shape, or structure of a protein can give important clues about how it can be altered by a medicine. Our medicinal chemists work closely with structural biology researchers to develop new medications targeted to a specific part of a protein related to disease.

High throughput screening

One of the most efficient methods of discovering new compounds that modify protein or cell behaviour is through the screening of large and diverse collections of small molecules. From this ‘chemical library’, small molecules that have the appropriate effect can be identified.

Chemical libraries can contain hundreds of thousands of distinct small molecules. These must each be tested in a consistent way to detect those compounds that have the desired effect.

In screening a chemical library it is important to include:

  • A rapid screening method that allows screening of the entire library in a time-efficient way.
  • A reliable readout that maximises the chance that a compound with the desired effect can be discovered, but minimises the chance of a ‘false positive’ compound that is wrongly detected despite not having the desired effect.

High throughput technology and powerful computing methods for analysing experimental data are important elements of screening.

Often, the small molecules discovered to have the desired effect may not have the best properties of a medicine. Medicinal chemists can make further chemical modifications to design a candidate new medication that is similar to the small molecule but has better stability, solubility and specificity.

Chemical biology

Medicinal chemistry aims to develop new compounds that treat certain diseases, but the processes used can also advance other research into those diseases.

Chemical biology develops and uses small molecules to precisely inhibit a specific protein or biological process. This can be invaluable to research into that molecule or process, and lead to a better understanding of how certain diseases develop. Chemical biology approaches can complement other research fields such as genetics, cell biology and molecular biology, to understand a biological process.

In the long run, some small molecules produced by chemical biology research can be the basis of new medications.

Researchers: 
Interview with Justin Boddey

The institute's malaria research team is homing in on a new target for malaria treatment

Professor Andrew Roberts in the lab

Professor Andrew Roberts discusses the results of a clinical trial of a potential new anti-cancer agent on ABC Radio.

Alignment of crystal structures for Bcl-2 family proteins

Collaborative research has led to a new compound that blocks a protein linked to poor responses to treatment in cancer patients

Professor Geoff Lindeman being interviewed

Professor Geoff Lindeman discusses his team's findings