Scientists have discovered that peptides—key building blocks of life—can remain stable and form structured shapes in highly acidic environments similar to the clouds of Venus.
The study, led by researchers at the Massachusetts Institute of Technology (MIT), suggests that complex biological molecules may be able to exist in conditions previously thought too extreme to support life.
Venus’s clouds are composed of around 98% sulfuric acid, an environment long considered hostile to most biological materials. However, the new research shows that short chains of amino acids, known as peptides, can not only survive in such conditions but also fold into defined three-dimensional structures.
Researchers say this ability to form stable shapes is important, as structure is closely linked to biological function. Molecules must adopt specific forms to interact with other compounds and carry out processes essential for life.
The findings challenge traditional assumptions that life can only exist on planets with Earth-like conditions, such as liquid water on the surface. Instead, scientists say the results open up the possibility that life—or at least its chemical precursors—could exist in a wider range of environments.
The team conducted experiments using concentrated sulfuric acid to simulate Venus’s cloud conditions. They found that peptides remained intact for weeks. According to the researchers, this stability may be due to the lack of water in such environments, which prevents chemical reactions that would normally break down peptide bonds.
Further analysis revealed that the peptides adopted unusual loop-shaped structures in the acidic solution. These shapes, known as omega loops, are also seen in some natural proteins and are associated with molecular recognition and function.
Scientists say this is the first clear evidence that peptides can maintain both stability and structural complexity in such extreme conditions.
The study also builds on earlier work showing that other biological molecules, including components similar to DNA, may remain stable in highly acidic environments.
Experts say the research could influence the search for life beyond Earth, particularly on planets that do not resemble Earth. It may also guide future missions aimed at studying Venus’s atmosphere more closely.
However, the researchers note that while the findings show that key molecules can survive, they do not confirm the existence of life on Venus. Further studies will be needed to determine whether such molecules could perform biological functions in real planetary conditions.
The research was published in the journal Proceedings of the National Academy of Sciences and was supported by several scientific foundations and institutions.
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