Elephant prolactin: isolation and characterization.

Elephant prolactin: isolation and characterization.
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大象催乳素:分离和表征。

DOI:
10.1111/j.1399-3011.1987.tb02273.x
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发表时间:
1987
期刊:
International journal of peptide and protein research
影响因子:
--
通讯作者:
Cabrera,CM
Cabrera,CM
中科院分区:
--
文献类型:
--
作者:
Li,CH;Chung,D;Bewley,TA;Cabrera,CM

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催乳素是从象脑垂体前叶中分离得到的。它由199个氨基酸组成,具有三个二硫键和两个色氨酸残基,如在其他物种的催乳素中所发现的。测定了NH 2-末端28个氨基酸的序列,并显示与绵羊激素同源。与绵羊催乳素相比,甲硫氨酸含量有显著差异;大象激素仅具有18-34%的催乳效力。用零级、二级和圆二色谱法研究了大象催乳素的构象。α螺旋含量估计为约60%。与其他物种的催乳素相比,大象催乳素的二级光谱表明,一个或两个色氨酸残基的局部微环境有些不同。
Prolactin was isolated from anterior lobes of elephant pituitary glands. It consisted of 199 amino acids with three disulfide bridges and two tryptophan residues as found in prolactin from other species. The sequence of the NH2‐terminal 28 amino acids was determined and shown homologous with the ovine hormone. In comparison with ovine prolactin, a marked difference was seen in the methionine content; the elephant hormone possessed only 18–34% lactogenic potency. The conformation of elephant prolactin was examined by zero order, second order and circular dichroism spectroscopy. The alpha helical content was estimated to be about 60%. In comparison with prolactins from other species, the second order spectra of elephant prolactin suggest that the local microenvironment for one or both tryptophan residues is somewhat different.
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