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• W2324706996 abstract "Lysine-specific demethylase 1A (KDM1A/LSD1) is a FAD-dependent enzyme that catalyzes the oxidative demethylation of histone H3K4me1/2 and H3K9me1/2 repressing and activating transcription, respectively. Although the active site is expanded compared to that of members of the greater amine oxidase superfamily, it is too sterically restricted to encompass the minimal 21-mer peptide substrate footprint. The remainder of the substrate/product is therefore expected to extend along the surface of KDM1A. We show that full-length histone H3, which lacks any posttranslational modifications, is a tight-binding, competitive inhibitor of KDM1A demethylation activity with a Ki of 18.9 ± 1.2 nM, a value that is approximately 100-fold higher than that of the 21-mer peptide product. The relative H3 affinity is independent of preincubation time, suggesting that H3 rapidly reaches equilibrium with KDM1A. Jump dilution experiments confirmed the increased binding affinity of full-length H3 was at least partially due to a slow off rate (koff) of 1.2 × 10–3 s–1, corresponding to a half-life (t1/2) of 9.63 min, and a residence time (τ) of 13.9 min. Independent affinity capture surface plasmon resonance experiments confirmed the tight-binding nature of the H3/KDM1A interaction, revealing a Kd of 9.02 ± 2.3 nM, a kon of (9.3 ± 1.5) × 104 M–1 s–1, and a koff of (8.4 ± 0.3) × 10–4 s–1. Additionally, no other core histones exhibited inhibition of KDM1A demethylation activity, which is consistent with H3 being the preferred histone substrate of KDM1A versus H2A, H2B, and H4. Together, these data suggest that KDM1A likely contains a histone H3 secondary specificity element on the enzyme surface that contributes significantly to its recognition of substrates and products." @default.
• W2324706996 created "2016-06-24" @default.
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• W2324706996 date "2016-02-09" @default.
• W2324706996 modified "2023-09-25" @default.
• W2324706996 title "Lysine-Specific Demethylase 1A (KDM1A/LSD1): Product Recognition and Kinetic Analysis of Full-Length Histones" @default.
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• W2324706996 doi "https://doi.org/10.1021/acs.biochem.5b01135" @default.
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