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For example, could one design a set of proteins that would read normal DNA and produce reverse chiral DNA?
It might be possible to make a hybrid protein, half normal chirality, half reverse chirality, so that it could, for example, read normal DNA, and produce either reverse chirality DNA or RNA.
One of the problems is that most of the tools that synthetic molecular biologists use are proteins and enzymes. Thus, it may be exceedingly difficult to synthesize the first reverse chirality protein, or piece of DNA or RNA.
While I understand the desire to produce life different than what is on Earth, I would still question the benefits of creating two environments that are mutually toxic to each other, especially in our solar system where we may eventually colonize most of the planets, and may have some interplanetary transportation.