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Chain Length and Inhibitory Potency of Retinoid Analogues
| Retinoid | Distance from carbon 4 to carbon 15 (Å) | Inhibitory potency |
|---|---|---|
| β-ionone | 7.55 | No inhibition |
| C15 aldehyde | 10.06 | No inhibition |
| C17 aldehyde | 12.58 | No inhibition |
| C22 aldehyde | 17.5 | IC50 = 415 nM |
| ATRa | 15 | IC50 = 220 nM |
| ATRol | 15 | IC50 = 300 nM |
| RA (−) | 15 | No inhibition |
| ATR-NBu (+)b | 15 | IC50 = ∼80 nM |
IC50 from McCabe et al. (2004).
Distance from C4 to C15 is 15 Å, but butylamine chain extends past the functional group (Fig. 1).
