Researchers make complex molecule that spontaneously folds like a protein

January 11, 2019 by Bob Yirka, report
Top view of the central cavity of the folded molecule. Credit: Bin Liu, University of Groningen

In biology, folded proteins are responsible for most advanced functions. These complex proteins are the result of evolution or design by scientists. Now, a team of scientists led by University of Groningen Professor of Systems Chemistry, Sijbren Otto, have discovered a new class of complex folding molecules that emerge spontaneously from simple building blocks. The results were published in the Journal of the American Chemical Society on 16 January.
A team of researchers from the Netherlands, Italy and Poland has developed a way to make complex molecules that spontaneously fold like proteins. In their paper published in the Journal of the American Chemical Society, the group describes their approach to manipulating molecules in useful ways, what they discovered, and the ways they believe their results might be used.

In nature, there are a number of proteins that fold spontaneously to carry out various functions. But misfolding can lead to problems, such as the development of neurological diseases. Scientists have been interested in such folding not only because it might help in understanding human ailments, but because it might be relevant to understanding how life began on Earth. In this new effort, the researchers sought to replicate the folding seen in nature by building their own spontaneously folding .

The researchers report that they achieved their goal—they found a way to create a self-assembling, self-folding molecule called a macrocycle. More specifically, a 15mer macrocycle made up of 75 atoms. To achieve the folding, the molecule was formed in the shape of a . The researchers note that the end result (called a foldamer) had a hydrophilic surface and a , which they note mirrors the structure of naturally occurring folding proteins. They further note that the foldamer was held together by , the interaction between ring stacking and a disulfide bridge. The molecule also had a third tiled structure made of stacks of rings.

Core part of the foldamer, showing five stacks of three phenyl rings connected by disulfide bonds. Credit: Bin Liu, University of Groningen

To induce spontaneous folding, the researchers added saltwater. They note that their molecule needed a nucleobase to form the macrocycle, but others, such as guanine or adenine, would work equally well. They next plan to work with the molecule they created to learn how to modify its self-assembly properties to create designer macrocycles in the future. They also note that their process demonstrates that folding molecules might have played a role in the beginning of life on Earth at an earlier stage than has been thought.

Explore further: Researchers discover the initial stages of the folding mechanism of membrane proteins

More information: Bin Liu et al. Complex Molecules that Fold like Proteins Can Emerge Spontaneously, Journal of the American Chemical Society (2018). DOI: 10.1021/jacs.8b11698

Press release

Related Stories

Chaperones just prepare proteins for folding on their own

April 26, 2018

Cellular proteins are produced as long chains of amino acids that must fold precisely into their final shape. The key players in this folding process are the so-called molecular chaperones, protein helpers that make sure ...

Researchers discover antifreeze protein with water filled core

February 14, 2014

( —A team of researches with Queen's University, in Canada has found that the antifreeze protein Maxi, defies the normal expectations of a protein by having a core filled with water molecules. In their paper published ...

Self-folding metamaterial

September 26, 2018

The more complex the object, the harder it is to fold up. Space satellites often need many small motors to fold up an instrument, and people have difficulty simply folding up a roadmap. Physicists from Leiden and Amsterdam ...

Biophysicists unravel exact folding of a single gene

December 1, 2017

The way genes are folded determines their activity in our body. Leiden University biophysicists are now the first to unravel this structure molecule-by-molecule. Publication on December 1st in Nature's Scientific Reports.

Recommended for you

Hand-knitted molecules

January 18, 2019

Molecules are usually formed in reaction vessels or laboratory flasks. An Empa research team has now succeeded in producing molecules between two microscopically small, movable gold tips – in a sense as a "hand-knitted" ...

Using bacteria to create a water filter that kills bacteria

January 18, 2019

More than one in 10 people in the world lack basic drinking water access, and by 2025, half of the world's population will be living in water-stressed areas, which is why access to clean water is one of the National Academy ...

Artificially produced cells communicate with each other

January 18, 2019

Friedrich Simmel and Aurore Dupin, researchers at the Technical University of Munich (TUM), have for the first time created artificial cell assemblies that can communicate with each other. The cells, separated by fatty membranes, ...

This computer program makes pharma patents airtight

January 17, 2019

Routes to making life-saving medications and other pharmaceutical compounds are among the most carefully protected trade secrets in global industry. Building on recent work programming computers to identify synthetic pathways ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.