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Updated: May 5, 2026

Chemical Inactivation of the E3 Ubiquitin Ligase Cereblon by Pomalidomide-based Homo-PROTACs
Published on: May 15, 2019
3-O-methoxyimino group inhibits interactions between progestins and blood transcortin
A V Polikarpova1, I S Levina, A N Smirnov
1Biological Faculty, Lomonosov Moscow State University, Moscow, 119899, Russia. kairo911@gmail.com.
Abstract:
The interactions between E- and Z-isomers of 3-O-methoxyimino-pregn-4-ene-20-one and its 17α-hydroxy derivative and transcortin from human blood were investigated. The substitution of the progesterone 3-oxo group for a 3-O-methoxyimino group was shown to diminish the affinity of the steroid for transcortin by approximately one order of magnitude irrespective of the substituent's orientation. The data suggests that progesterone derivatives substituted thereby must have higher bioavailability compared to progesterone and must not significantly affect the biodynamics of glucocorticoid in vivo.
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