[DIYbio] Protein trigger in TALEN, ZFN, ...

Hi everyone! 


I have a conceptual question for Prime-Editing and Zinkfinger Nucleases. 

Let's say ZFN:
1) You take a natural protein domain that binds DNA of a specific sequence. 
2) You add a Nuclease domain to the above metnione protein.  
Why doesn't the Nuclease Domain always cut any DNA when it bumps into it, and just when the DNA-binding domain binds DNA? (Unless it's FokI which needs to dimerize if I recall correctly). Is there a term that I can google to find papers? 

I assume there is a conformational change that activates the nuclease domain. But how do you design this? 

Same with CRISPR that changes C->T (I think they termed that CRISPR base editing). You add a deaminase to CRISPR, why doesn't the deanimase just float around in the nucleus and deanimate every base it hops by? 

Any insight would be greatly appreciated! 

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