Sugar found in meteorites may have helped secure its own survival on early Earth
Is there life elsewhere, or is Earth unique in the universe? This is one of humanity's great unanswered questions. One way to approach this mystery is to investigate how life began here on Earth. Our research explores the conditions in which a mixture of molecules somehow transformed from chemistry into biology.
A recent study published in Scientific Reports reveals that a sugar molecule found in meteorites may have played a pivotal role in the development of life on early Earth. This sugar, ribose, is a key component of RNA, which is essential for storing and using genetic information in modern organisms. Ribose is fragile and can easily break down, but boron compounds can protect it from degradation.
Borate, a molecule containing boron, oxygen, and hydrogen, binds to ribose and prevents it from breaking down. However, boron is often present in minerals rather than dissolved in water, limiting its availability for chemical reactions. The new study, conducted using actual minerals from the Puga hot springs in India, suggests that ribose itself may help dissolve borate minerals and keep them available for reactions.
This creates a two-way relationship: borate protects ribose, while ribose helps keep borate dissolved. Early Earth would have been a very different place, with little oxygen, intense volcanism, and a heavy rain of meteorites delivering carbon-containing molecules to the planet. The Murchison meteorite, which fell in 1969, contained ribose along with other sugars.
These carbon-rich meteorites may have accumulated in shallow lakes and pools, concentrating organic molecules into chemical soups. The study highlights how the presence of sugars in these early soups could have influenced the formation of minerals on Earth's surface, potentially reshaping landscapes and providing a unique perspective on the origins of life.
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