Amino acids and peptides. XIII. Synthesis of a nonacosapeptide corresponding to the N-terminal sequence 1-29 (.BETA.-fragment) of human liver metallothionein II (hMT II) and its heavy metal-binding properties.
摘要:
通过叠氮偶联五种肽段[1、2、4、6和8],然后进行高频脱保护,合成了对应于人肝金属硫蛋白II(hMT II)N端序列1-29(β-片段)的非酰肽,并考察了其重金属结合特性。结果表明,与 hMT II C 端序列 30-61 相应的合成 β 片段和合成 α 片段的镉结合能力强于原生大鼠硫蛋白。此外,研究还发现α-片段和β-片段都优先与铜离子而不是镉离子结合。
Amino acids and peptides. IX. Synthesis of cysteine-containing peptide fragments related to human hepatic metallothionein II (hMT II) and determination of their heavy metal-binding properties.
Amino acids and peptides. IX. Synthesis of cysteine-containing peptide fragments related to human hepatic metallothionein II (hMT II) and determination of their heavy metal-binding properties.
作者:NORIYA OHTA、YOSHIO OKADA、KEIICHI TANAKA
DOI:10.1248/cpb.31.3094
日期:——
Eight kinds of cysteine-containing peptides related to human hepatic metallothionein were synthesized by conventional methods. The metal-binding properties of these peptides with Zn2+ and Cd2+ were indicated by an increase of ultraviolet absorbance resulting from mercaptide formation. The Cd-binding activities of various peptides obtained here were assessed by measuring the increase in absorbance of mercaptide at 250 nm as a function of the concentration of Cd. The binding abilities of the peptides with Cd differed substancially.
Amino acids and peptides. XIII. Synthesis of a nonacosapeptide corresponding to the N-terminal sequence 1-29 (.BETA.-fragment) of human liver metallothionein II (hMT II) and its heavy metal-binding properties.
A nonacosapeptide corresponding to the N-terminal sequence 1-29 (β-fragment) of human liver metallothionein II (hMT II) was synthesized by the azide coupling of five peptide fragments [1, 2, 4, 6 and 8], followed by HF deprotection and its heavy metal-binding properties were examined. It was revealed that the Cd-binding ability of the synthetic β-fragment as well as synthetic α-fragment corresponding to the C-terminal sequence 30-61 of hMT II was stronger than that of native rat thionein. Moreover, it was found that both the α-and β-fragments bound preferentially to Cu ions rather than Cd ions.
通过叠氮偶联五种肽段[1、2、4、6和8],然后进行高频脱保护,合成了对应于人肝金属硫蛋白II(hMT II)N端序列1-29(β-片段)的非酰肽,并考察了其重金属结合特性。结果表明,与 hMT II C 端序列 30-61 相应的合成 β 片段和合成 α 片段的镉结合能力强于原生大鼠硫蛋白。此外,研究还发现α-片段和β-片段都优先与铜离子而不是镉离子结合。