This is the C-terminal helical domain from Lysine-specific demethylase 5 subfamily (KDM5), which is localised between the Jumonji C (JmjC) domain and the C5HC2 zinc finger motif (Pfam:PF02928) [1-5].

1: Structural analysis of human KDM5B guides histone demethylase inhibitor development. Johansson C, Velupillai S, Tumber A, Szykowska A, Hookway ES, Nowak RP, Strain-Damerell C, Gileadi C, Philpott M, Burgess-Brown N, Wu N, Kopec J, Nuzzi A, Steuber H, Egner U, Badock V, Munro S, LaThangue NB, Westaway S, Brown J, Athanasou N, Prinjha R, Brennan PE, Oppermann U; Nat Chem Biol. 2016;12:539-545. PMID:27214403

2: Potent and Selective KDM5 Inhibitor Stops Cellular Demethylation of H3K4me3 at Transcription Start Sites and Proliferation of MM1S Myeloma Cells. Tumber A, Nuzzi A, Hookway ES, Hatch SB, Velupillai S, Johansson C, Kawamura A, Savitsky P, Yapp C, Szykowska A, Wu N, Bountra C, Strain-Damerell C, Burgess-Brown NA, Ruda GF, Fedorov O, Munro S, England KS, Nowak RP, Schofield CJ, La Thangue NB, Pawlyn C, Davies F, Morgan G, Athanasou N, Muller S, Oppermann U, Brennan PE; Cell Chem Biol. 2017;24:371-380. PMID:28262558

3: An inhibitor of KDM5 demethylases reduces survival of drug-tolerant cancer cells. Vinogradova M, Gehling VS, Gustafson A, Arora S, Tindell CA, Wilson C, Williamson KE, Guler GD, Gangurde P, Manieri W, Busby J, Flynn EM, Lan F, Kim HJ, Odate S, Cochran AG, Liu Y, Wongchenko M, Yang Y, Cheung TK, Maile TM, Lau T, Costa M, Hegde GV, Jackson E, Pitti R, Arnott D, Bailey C, Bellon S, Cummings RT, Albrecht BK, Harmange JC, Kiefer JR, Trojer P, Classon M; Nat Chem Biol. 2016;12:531-538. PMID:27214401

4: 8-Substituted Pyrido[3,4-d]pyrimidin-4(3H)-one Derivatives As Potent, Cell Permeable, KDM4 (JMJD2) and KDM5 (JARID1) Histone Lysine Demethylase Inhibitors. Bavetsias V, Lanigan RM, Ruda GF, Atrash B, McLaughlin MG, Tumber A, Mok NY, Le Bihan YV, Dempster S, Boxall KJ, Jeganathan F, Hatch SB, Savitsky P, Velupillai S, Krojer T, England KS, Sejberg J, Thai C, Donovan A, Pal A, Scozzafava G, Bennett JM, Kawamura A, Johansson C, Szykowska A, Gileadi C, Burgess-Brown NA, von Delft F, Oppermann U, Walters Z, Shipley J, Raynaud FI, Westaway SM, Prinjha RK, Fedorov O, Burke R, Schofield CJ, Westwood IM, Bountra C, Muller S, van Montfort RL, Brennan PE, Blagg J; J Med Chem. 2016;59:1388-1409. PMID:26741168

5: Structure of the Arabidopsis JMJ14-H3K4me3 Complex Provides Insight into the Substrate Specificity of KDM5 Subfamily Histone Demethylases. Yang Z, Qiu Q, Chen W, Jia B, Chen X, Hu H, He K, Deng X, Li S, Tao WA, Cao X, Du J; Plant Cell. 2018;30:167-177. PMID:29233856