Interaction of cycloalkanoprogesterones with mammalian progesterone receptor: binding of pregna-D'-pentaranes in the calf uterine cytosol |
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Authors: | Amrita Bhakta Michelle Herman Inna S Levina V K Moudgil |
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Institution: | (1) Department of Biological Sciences, Oakland University, 48309-4401 Rochester, MI, USA;(2) Institute for Biochemistry and Biotechnology, Oakland University, 48309-4401 Rochester, MI, USA;(3) N.D. Zelinsky Institute of Organic Chemistry, Academy of Sciences, Russia, Leninsky pr 47, 117913 Moscow, Russia |
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Abstract: | Pregna-D'-pentaranes (pentaranes) are modified progesterones with demonstrable progestational activity and contraceptive effect. We have examined the steroid binding characteristics of the two newly synthesized progesterone analogs, Pentarane A (16 , 17 -cyclohexanoprogesterone) and Pentarane B (6 -methyl, 16 , 17 -cyclohexanoprogesterone), and studied the nature of their interaction with progesterone receptor (PR) from the chicken oviduct and the calf uterine cytosols. Pregna-D'-pentaranes exhibited no affinity for the chick PR but interacted with the calf uterine PR as did R5020. The pentaranes, however, bound PR less tightly. R5020- or pentarane-bound PR sedimented as an 8S moiety in 8–30% linear glycerol gradients. Thermal transformation of receptor resulted in the reduction of the 8S form, and caused an increase in the binding of R5020-and progesterone-bound PR complexes to DNA-cellulose. The pentarane-bound PR bound poorly, if at all, to DNA-cellulose. Our data suggest that pentaranes exhibit both similarities and differences with natural and synthetic progestins with respect to their interaction with calf uterine PR. The lack of pentarane binding to chicken PR is reminiscent of the general phenomenon that antiprogestins (RU486, ZK98299, and Org 31710 and Org 31806) do not interact with chicken PR. Pentaranes, therefore, represent unique steroid analogs to investigate the molecular mechanism of steroid hormone action.Abbreviations DMSO
Dimethyl sulfoxide
- DTT
Dithiothreitol
- E
Estradiol
- EDTA
Ethylene-diaminetetraacetate
- F
Cortisol
- IA
Iodoacetamide
- MER
-mercaptoethanol
- MTG
Monothioglycerol
- NEM
N-ethylmaleimide
- Org 31710
(6 , 11 , 17 )-11-(4-dimethylaminophenyl)-6 methyl-4 , 5 -dihydroestra-4, 9-diene-17, 2 (3H')-furna]-3-one
- Org 31806
(7 , 11 , 17 )-11-(4-dimethyl-aminophenyl)-7 methyl-4 , 5 -dihydroestra-4, 9-diene-17, 2 (3H)-furan]-3-one
- P
Progesterone
- Pentarane A
16 , 17 -cyclohexanoprogesterone
- Pentarane B
6 -methyl, 16 , 17 -cyclohexanoprogesterone
- PMSF
Phenylmethylsulfonyl Fluoride
- PR
Progesterone Receptor
- R5020
17, 21-dimethylpregna-4, 9(10)-diene-3 |
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Keywords: | receptors progesterone steroid analogues DNA binding |
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