3ubt is a 9 chain structure with sequence from Haemophilus aegyptius. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
MTH3_HAEAE This methylase recognizes the double-stranded sequence GGCC, causes specific methylation on C-3 on both strands, and protects the DNA from cleavage by the HaeIII endonuclease.