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New analogs of 2-methylene-19-nor-(20S)-1,25-dihydroxyvitamin D3 with conformationally restricted side chains: evaluation of biological activity and structural determination of VDR-bound conformations.

Abstract：

:We have successfully prepared E- and Z- isomers of 17-20 dehydro analogs of 2-methylene-19-nor-(20S)-1alpha,25-dihydroxyvitamin D3 (2MD). Both isomers bind to the recombinant rat vitamin D receptor (VDR) with high affinity. The Z-isomer (Vit-III 17-20Z) displays activity in vivo and in vitro that is similar to 2MD. The in vitro activity of the E-isomer (Vit-III 17-20E) is comparable to the natural hormone, though in vivo this analog is significantly less calcemic. Crystal structures of the rat VDR ligand binding domain complexed with the analogs demonstrate that the Vit-III 17-20Z analog is oriented almost identically to 2MD, with only minor differences induced by the planar configuration around the C17-C20 double bond. The Vit-III 17-20E analog is oriented in a conformation distinct from both 2MD and the natural hormone. The structural comparisons suggest that the position of C21 in the ligand binding site may be an important determinant of biological activity.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Vanhooke JL,Tadi BP,Benning MM,Plum LA,DeLuca HF

doi

10.1016/j.abb.2006.11.029

subject

Has Abstract

pub_date

2007-04-15 00:00:00

pages

161-5

issue

2

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(06)00480-2

journal_volume

460

pub_type

杂志文章

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