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Selectivity of a C-terminal peptide antiserum for different DNA-binding states of the vitamin D receptor.

Abstract：

:Antisera against peptides from the extreme N- and C-terminal regions of the VDR were evaluated. The N-terminal antiserum Ab192 functioned as a general-purpose antibody, being able to supershift the rhVDR in heterodimeric or homodimeric binding complexes in the EMSA, and detect both recombinant and native forms of the receptor on Western blots. The C-terminal antiserum, Ab195, also identified the receptor on Western blots, but in contrast, it displayed differential sensitivity to the conditions employed in the EMSA. In the presence of 1,25(OH)2D3, rhVDR, rhRXR alpha, and nonspecific DNA, Ab195 produced a weak supershift of the heterodimer complex in the EMSA. Significantly, omission of hormone from the binding buffer resulted in a complete shift of the bound complex with the antiserum. A complete supershift was also observed if only the nonspecific DNA was removed. Together these results indicate antiserum sensitivity to the ligand status in the rhVDR C-terminus as part of a DNA-bound heterodimer complex. Inclusion of 9-cis RA resulted in a modest increase in the amount of shifted product relative to 1,25(OH)2D3 alone. Finally, Ab195 completely supershifted the rhVDR homodimer binding complex under all tested conditions, including those analogous to where it was largely ineffective in shifting the heterodimer. Thus, Ab195 is sensitive to the ligand binding status of the VDR, discriminates heterodimer and homodimer binding interactions, and should provide an additional tool for exploring conformational changes induced in the receptor.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Koszewski NJ,Reinhardt TA,Langub MC,Malluche HH,Horst RL

doi

10.1006/abbi.1997.0481

subject

Has Abstract

pub_date

1998-01-15 00:00:00

pages

388-96

issue

2

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(97)90481-1

journal_volume

349

pub_type

杂志文章

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