That's what I meant. It should be easier to take a pore forming domain from colicin and attach it to a domain that binds a - very conserved - receptor of your target bacterium. So it should bind your bacteria, make a hole in the membrane (many molecules -> many holes) and the bacterium dies.
Sounds easier than de-novo design. And you don't have to watch bacteria for that. You can test protein interactions with various methods, and if you take a very conserved protein (usualy phages choose them as their target), you might end up with somethingthat works.
I hope that's helpful!
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Re: [DIYbio] Viewing bacteria on a molecular level, how to do molecular modeling, and seeking beginner guidance
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