Study on the Effects of Cadmium in Activity and Structure of Cu,Zn-SOD
碩士 === 台北醫學院 === 醫學研究所 === 89 === Of Amyotrophic Lateral Sclerosis (ALS) , a progressive neurodegenerative disorder cases, 10% are familial and 90% are sporadic. The mutations found in the Cu,Zn-SOD (SOD1) are the causes of 20% of familial ALS. Most mutations cause the decrease of the SOD...
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ndltd-TW-089TMC005340302015-10-13T12:46:49Z http://ndltd.ncl.edu.tw/handle/04686307416009950588 Study on the Effects of Cadmium in Activity and Structure of Cu,Zn-SOD 鎘對銅鋅超氧化物岐化酵素活性與構造影響之研究 Meng-Ling Tsai 蔡孟苓 碩士 台北醫學院 醫學研究所 89 Of Amyotrophic Lateral Sclerosis (ALS) , a progressive neurodegenerative disorder cases, 10% are familial and 90% are sporadic. The mutations found in the Cu,Zn-SOD (SOD1) are the causes of 20% of familial ALS. Most mutations cause the decrease of the SOD enzyme activity and some of them are due to the loss of zinc affinity or alteration of the zinc binding site. Zinc and cadmium constitute group IIB of the periodic table of elements and are uniformly divalent. They share certain common biological responses. In order to investigate the possible causes of heavy metal interactions, we have constructed, expressed, and purified human Cu,Zn-SOD in E. coli with equal amounts of copper and zinc but different concentrations of cadmium in LB broth. First, SDS-PAGE and western blot analysis illustrated a 23kDa monomer. Second, the more cadmium added, the lower enzyme activities remained. Third, by atomic absorption spectrophotometer, we found that the more cadmium added, the more cadmium atoms and the less zinc atoms detected in purified Cu,Zn-SOD. The results of observation and estimation of the purified Cu,Zn-SOD protein structure from native gel and circular dichroism indicate that the structure of apo-SOD, without any metals, is much different from Cu,Zn-SOD and Cu,Zn-SOD with 500 nM cadmium. Besides, secondary structure of Cu,Zn-SOD with 500 nM cadmium is much close to apo-SOD. On the other hand, we have confirmed that cadmium is a strong inducer of metallothionein as previous studies reported. These results indicated that cadmium might effect zinc contents of Cu,Zn-SOD owing to its strong induction of metallothioneins which also bind zinc. Therefore, cadmium might play a role in sporadic ALS. These findings may offer some directions to study pathogenic mechanism. Chien-Tsu Chen 陳建志 2001 學位論文 ; thesis 0 zh-TW |
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碩士 === 台北醫學院 === 醫學研究所 === 89 === Of Amyotrophic Lateral Sclerosis (ALS) , a progressive neurodegenerative disorder cases, 10% are familial and 90% are sporadic. The mutations found in the Cu,Zn-SOD (SOD1) are the causes of 20% of familial ALS. Most mutations cause the decrease of the SOD enzyme activity and some of them are due to the loss of zinc affinity or alteration of the zinc binding site.
Zinc and cadmium constitute group IIB of the periodic table of elements and are uniformly divalent. They share certain common biological responses. In order to investigate the possible causes of heavy metal interactions, we have constructed, expressed, and purified human Cu,Zn-SOD in E. coli with equal amounts of copper and zinc but different concentrations of cadmium in LB broth. First, SDS-PAGE and western blot analysis illustrated a 23kDa monomer. Second, the more cadmium added, the lower enzyme activities remained. Third, by atomic absorption spectrophotometer, we found that the more cadmium added, the more cadmium atoms and the less zinc atoms detected in purified Cu,Zn-SOD.
The results of observation and estimation of the purified Cu,Zn-SOD protein structure from native gel and circular dichroism indicate that the structure of apo-SOD, without any metals, is much different from Cu,Zn-SOD and Cu,Zn-SOD with 500 nM cadmium. Besides, secondary structure of Cu,Zn-SOD with 500 nM cadmium is much close to apo-SOD.
On the other hand, we have confirmed that cadmium is a strong inducer of metallothionein as previous studies reported. These results indicated that cadmium might effect zinc contents of Cu,Zn-SOD owing to its strong induction of metallothioneins which also bind zinc. Therefore, cadmium might play a role in sporadic ALS. These findings may offer some directions to study pathogenic mechanism.
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author2 |
Chien-Tsu Chen |
author_facet |
Chien-Tsu Chen Meng-Ling Tsai 蔡孟苓 |
author |
Meng-Ling Tsai 蔡孟苓 |
spellingShingle |
Meng-Ling Tsai 蔡孟苓 Study on the Effects of Cadmium in Activity and Structure of Cu,Zn-SOD |
author_sort |
Meng-Ling Tsai |
title |
Study on the Effects of Cadmium in Activity and Structure of Cu,Zn-SOD |
title_short |
Study on the Effects of Cadmium in Activity and Structure of Cu,Zn-SOD |
title_full |
Study on the Effects of Cadmium in Activity and Structure of Cu,Zn-SOD |
title_fullStr |
Study on the Effects of Cadmium in Activity and Structure of Cu,Zn-SOD |
title_full_unstemmed |
Study on the Effects of Cadmium in Activity and Structure of Cu,Zn-SOD |
title_sort |
study on the effects of cadmium in activity and structure of cu,zn-sod |
publishDate |
2001 |
url |
http://ndltd.ncl.edu.tw/handle/04686307416009950588 |
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