Steroid-binding site of human and rabbit sex steroid binding protein of plasma: fluorescence characterization with equilenin.
Steroid-binding site of human and rabbit sex steroid binding protein of plasma: fluorescence characterization with equilenin.
复制标题
人和兔血浆性类固醇结合蛋白的类固醇结合位点:用马烯雌酮进行荧光表征。
DOI:
10.1021/bi00357a060
复制
发表时间:
1986
期刊:
影响因子:
2.9
通讯作者:
Ross,JB
中科院分区:
文献类型:
--
作者:
Orstan,A;Lulka,MF;Eide,B;Petra,PH;Ross,JB
Revised Manuscript Received December 3, 1985 abstract: The interaction of the estrogen¿-3-hydroxy-1, 3, 5 (10), 6, 8-estrapentaen-17-one (equilenin) with the human and rabbit sex steroid binding proteins (hSBP and rSBP, respectively) has been investigated by using fluorescence and absorption spectroscopy. Equilenin competes for the binding of 5a-dihydro-testosterone. The calculated binding constant of equilenin forrSBP is 1.9 X 107 M-1 at 4 C, which can be compared with the binding constant of 5.7 X 107 M" 1 reported for hSBP [Ross, JB A., Torres, R., & Petra, P. H.(1982) FEBS Lett. 149, 240]. The results of fluorescence quenching experiments with the collisional quenchers KI and acrylamide indicate that the bound steroid has limited accessibility to the bulk solvent and that there are no anionic surface groups near the steroid-binding site. The fluorescence excitation spectra of SBP-equilenin complexes are similar to the absorption spectra of equilenin in low-dielectric solvents.The fluorescence emission of the SBP-equilenin complexes, however, exhibits wavelength shifts (red shifts) opposite to those of the steroid in low-dielectric solvents or complexed with/3-cyclodextrin (blue shifts) but similar to the red shift produced by addition of the proton acceptor triethylamine to equilenin in cyclohexane. These dataindicate that the steroid-binding site of hSBP and rSBP is a nonpolar cavity containing a proton acceptor that participates in a specific interaction, possibly a hydrogen bond, with the 3'-hydroxyl group of the bound steroid.
登录
查看更多内容
影响因子:
2.9
作者:
P. Pétra;J. Lewis
通讯作者:
J. Lewis
DOI:
--
发表时间:
1968
期刊:
影响因子:
--
作者:
A. Kalantar
通讯作者:
A. Kalantar
影响因子:
4.4
作者:
N. Mataga;Y. Kaifu
通讯作者:
Y. Kaifu
影响因子:
--
作者:
J. Lakowicz;H. Cherek;A. Balter
通讯作者:
A. Balter
影响因子:
3.5
作者:
K. Mickelson;P. Pétra
通讯作者:
P. Pétra