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Cas9 has two catalytic domains (HNH & RuvC) that perform DNA cleavage - one domain per...

Cas9 has two catalytic domains (HNH & RuvC) that perform DNA cleavage - one domain per strand of DNA. At the chemical level, are these two domains catalyzing DNA cleavage in a similar fashion to each other? What are the similarities or differences?

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Cas9 contains two magnesium-dependent nuclease domains: an HNH domain that cleaves the complementary (target) strand of the DNA target, and a RuvC domain responsible for cleavage of the displaced noncomplementary (non-target) DNA strand.

The RuvC domain is encoded by sequentially disparate sites that interact in the tertiary structure to form the RuvC cleavage domain.

Despite low sequence similarity, the sequence similar to RNase H has a RuvC fold (one member of RNase H family) and the HNH region folds as T4 Endo VII (one member of HNH endonuclease family).

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