A Needle in a Base-Stack: Cas9 Structural Biology
Type
Blog Post
Published
June 4, 2024, 1:15 p.m.
...DNA, the CTD is also sometimes called the PAM-interacting (PI) domain.
The guide RNA is bound primarily...most likely through unstructured electrostatic interactions. It also can’t recognize PAMs, so it associates... less stringent recognition mechanism that can tolerate mismatches in this region.
The crystal structure.... As mentioned above, however, Cas9 sometimes tolerates mismatches in the next 8-10 bases after perfect...this region of Cas9 also allows the protein to tolerate RNA:DNA mismatches between base pairs 18 and 20...Each new structural insight also spurs the next generation of engineered CRISPR enzymes with their own tradeoffs...Molecular graphics and analyses performed with UCSF ChimeraX, developed by the Resource for Biocomputing, Visualization...