The active site of the SET domain is constructed on a knot
Jacobs, S.A., Harp, J.M., Devarakonda, S., Kim, Y., Rastinejad, F., Khorasanizadeh, S.(2002) Nat Struct Biol 9: 833-838
- PubMed: 12389038 
- DOI: 10.1038/nsb861
- Primary Citation of Related Structures:  
1MT6, 1MUF - PubMed Abstract: 
The SET domain contains the catalytic center of lysine methyltransferases that target the N-terminal tails of histones and regulate chromatin function. Here we report the structure of the SET7/9 protein in the absence and presence of its cofactor product, S-adenosyl-L-homocysteine (AdoHcy) ...