Venus’s sulfurous clouds are among the most chemically brutal environments in the solar system, but a new study suggests they may not be entirely hostile to the molecular machinery of life. Researchers report that peptides—short chains of amino acids—can fold into structures called omega loops under highly acidic conditions. These loops are associated with biological functions in proteins.
Omega loops are a type of protein structure in which the chain folds back on itself, forming a loop. Their presence in acidic environments is significant because Venus’s clouds are composed largely of concentrated sulfuric acid, a setting long assumed to be too corrosive for complex organic chemistry. The new work indicates that at least some biologically relevant folding can survive such conditions.
While the results do not prove that life exists on Venus, they narrow one of the major objections to the idea that the planet’s clouds could host prebiotic or biological chemistry. The study adds to a growing body of work examining whether the Venusian cloud layer is more chemically hospitable than its harsh reputation suggests.