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these luddite scientists keep telling me to turn off my prion printer and I'm sick and tired of it
you can tell which ones are mirror bacteria from the goatees and sexier outfits
The Mirror Universe aka the Bisexual Universe
Just a race between various armageddons to see what kills us all first
A lot of organic molecules, including DNA base pairs, have a property called "chirality" (aka "handedness") where the mirror image of a molecule cannot be superimposed on the molecule itself (like hands).
DNA is used as a template for creating proteins. All living organisms have "right-handed" DNA, so all of our proteins also have the same handedness. The "mirror life" they're talking about would be organisms with "left-handed" DNA and proteins.
A molecule's chirality has a ton of impact on its chemical properties. For example, the decongestant in an over-the-counter nasal spray is l-methamphetamine; its right-handed version, d-methamphetamine is — you guessed it — meth.
Proteins are incredibly large and complicated molecules that have intricate 3D structures. Interactions between different proteins depend on this 3D structure — for example, that's why there's been so much concern in minor changes in the COVID "spike protein" that allows it to enter cells and get detected by the immune system. That's not even to mention the danger posed by misfolded proteins (which can caused diseases like alzheimers) or prions (which cause diseases like mad cow).
The concern is that: living organisms are literally not set up to handle reverse-handed proteins. Hypothetical "mirror bacteria" made out of reverse-handed DNA, proteins, etc have the potential to easily cause ecological disaster.
Ironically, Walter White discusses chirality at some point in breaking bad
They're presenting the worst case scenario, but I would expect a bacteria with its chirality flipped would just die of starvation if it ever got loose in the wider ecosystem
depends on what it eats and how it eats. If it photosynthesizes, I think it could be viable; water, O2, and CO2 are non-chiral. Alternatively, if it's not an autotroph but it evolves specialized metabolic enzymes after enough generations in an industrial vat, or someone engineers those enzymes with whatever tech we have in the next few decades, that might also be a path to viability. I think there's already research on enzymatic pathways for converting D-sugars to L-sugars. https://www.researchgate.net/publication/221847354_Enzymes_for_the_biocatalytic_production_of_rare_sugars
This would have no bearing on adaptive immune responsr