OF-1 is a chemical probe for BRPF bromodomains. OF-1 has been shown to bind to BRPF1B with a KD of 100 nM (ITC), to BRPF2 with a KD of 500 nM (ITC) and to BRPF3 with a KD of 2.4 uM (ITC). Selectivity against other bromodomains is very good, in general >100-fold. The closest off-target effects are against BRD4 (39-fold selectivity) and TIF1a (50% inhibition at 20 M in the alphascreen).
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