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SET domain (including post-SET domain) found in histone-lysine N-methyltransferase 5B (KMT5B) and similar proteins KMT5B (also termed lysine N-methyltransferase 5B, lysine-specific methyltransferase 5B, suppressor of variegation 4-20 homolog 1, Su(var)4-20 homolog 1 or Suv4-20h1) is a histone methyltransferase that specifically trimethylates 'Lys-20' of histone H4 (H4K20me3). It plays a central role in the establishment of constitutive heterochromatin in pericentric heterochromatin regions.
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