Elephant prolactin: isolation and characterization.
Elephant prolactin: isolation and characterization.
复制标题
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:
影响因子:
--
通讯作者:
Cabrera,CM
中科院分区:
文献类型:
--
作者:
Li,CH;Chung,D;Bewley,TA;Cabrera,CM
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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