This is the tudor domain found in histone demethylase Jumonji domain-containing protein 2A (JMJD2A). Structure and function analysis indicate that this domain can recognize equally well two unrelated histone peptides, H3K4me3 and H4K20me3, by means of two very different binding mechanisms [3]. JMJD2 also known as KDM4, is a conserved iron (II)-dependent jumonji-domain demethylase subfamily that is essential during development. Vertebrate KDM4A-C proteins contain a conserved double tudor domain (DTD) [6].

1: Phf19 links methylated Lys36 of histone H3 to regulation of Polycomb activity. Ballare C, Lange M, Lapinaite A, Martin GM, Morey L, Pascual G, Liefke R, Simon B, Shi Y, Gozani O, Carlomagno T, Benitah SA, Di Croce L; Nat Struct Mol Biol. 2012;19:1257-1265. PMID:23104054

2: Recognition of histone H3 lysine-4 methylation by the double tudor domain of JMJD2A. Huang Y, Fang J, Bedford MT, Zhang Y, Xu RM; Science. 2006;312:748-751. PMID:16601153

3: Distinct binding modes specify the recognition of methylated histones H3K4 and H4K20 by JMJD2A-tudor. Lee J, Thompson JR, Botuyan MV, Mer G; Nat Struct Mol Biol. 2008;15:109-111. PMID:18084306

4: An H3K36 methylation-engaging Tudor motif of polycomb-like proteins mediates PRC2 complex targeting. Cai L, Rothbart SB, Lu R, Xu B, Chen WY, Tripathy A, Rockowitz S, Zheng D, Patel DJ, Allis CD, Strahl BD, Song J, Wang GG; Mol Cell. 2013;49:571-582. PMID:23273982

5: Molecular basis for H3K36me3 recognition by the Tudor domain of PHF1. Musselman CA, Avvakumov N, Watanabe R, Abraham CG, Lalonde ME, Hong Z, Allen C, Roy S, Nunez JK, Nickoloff J, Kulesza CA, Yasui A, Cote J, Kutateladze TG; Nat Struct Mol Biol. 2012;19:1266-1272. PMID:23142980

6: Reader domain specificity and lysine demethylase-4 family function. Su Z, Wang F, Lee JH, Stephens KE, Papazyan R, Voronina E, Krautkramer KA, Raman A, Thorpe JJ, Boersma MD, Kuznetsov VI, Miller MD, Taverna SD, Phillips GN Jr, Denu JM; Nat Commun. 2016;7:13387. PMID:27841353