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Another way to get the right chiral mix for life to get a start.Amino acids have been found in interstellar clouds and in meteorites – but with some enigmatic omissions and tantalizing similarities to life on Earth. Just why some amino acids are present in meteorites and others are absent, and why they seem to prefer the same "left-handed" molecular structure as Earth's living amino acids are questions that could unravel one of the most fundamental questions of science: Where and how did life begin?
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Making the case for cosmic origins of Earth's amino acids even more compelling is the fact that all of the meteorite amino acids, except glycine, favor the "left-handed" molecular structure, or chirality, that is also favored by life on Earth. The preference for left-handed amino acids was a necessary precondition for life, but just why life chose left (L-amino acids) over right (D-amino acids) is a mystery.
"Essentially all of your protein is made of L-amino acids," said Macko. "Why is that? We don't know. The curious thing is that if you go to a meteorite you find a predominance of the same thing."