A team of scientists from the University of California, Berkeley, has discovered why some proteins are able to fold and function much faster than others. The findings, published in the journal Nature, could have implications for the design of new drugs and therapies.

Proteins are essential molecules that play a vital role in almost every aspect of life. They are made up of amino acids, which are linked together in a specific order to form a unique three-dimensional structure. This structure determines the protein's function.

The folding of proteins is a complex and dynamic process that can take milliseconds, seconds, or even minutes. The speed of folding is crucial because it affects the protein's stability and function. Proteins that fold too slowly may be more susceptible to misfolding, which can lead to diseases such as Alzheimer's and Parkinson's.

The Berkeley team, led by professor of biophysics and chemistry Carlos Bustamante, used a combination of experimental and computational techniques to study the folding of a small protein called chymotrypsin inhibitor 2 (CI2). They found that the speed of folding is determined by the number of contacts that the protein makes with itself as it folds. Proteins that make more contacts fold faster because they have a lower energy barrier to overcome.

This finding could have important implications for the design of new drugs and therapies. By understanding how to control the folding speed of proteins, scientists may be able to design drugs that are more stable and effective. They may also be able to develop new therapies to correct misfolding diseases.

"This discovery represents a significant breakthrough in our understanding of protein folding," said Bustamante. "It has the potential to revolutionize the way we design drugs and therapies."