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中位-四(4-N-氰甲基吡啶)卟啉-铜(Ⅱ)络合物及其与脱氧核糖核酸的复合物的表面增强喇曼光谱研究 被引量:6
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作者 周光明 盛蓉生 +3 位作者 熊亚 徐知三 王小华 曾云鹗 《分析化学》 SCIE EI CAS CSCD 北大核心 1995年第9期1022-1027,共6页
本文在银胶活性基质上获得了Cu(Ⅰ)的中位-四(4-N-氰甲基吡啶)卟啉络合物Cu(Ⅰ)NACN的表面增强喇曼光谱(SERS)光谱,并与其RRS光谱作了比较,讨论了pH值和Cu(Ⅰ)NACN的浓度对其SERS光谱的影响,研究了小牛胸腺双链DNA及其变性DNA与Cu(I)NAC... 本文在银胶活性基质上获得了Cu(Ⅰ)的中位-四(4-N-氰甲基吡啶)卟啉络合物Cu(Ⅰ)NACN的表面增强喇曼光谱(SERS)光谱,并与其RRS光谱作了比较,讨论了pH值和Cu(Ⅰ)NACN的浓度对其SERS光谱的影响,研究了小牛胸腺双链DNA及其变性DNA与Cu(I)NACN的复合物的SERS光谱,指出Cu(Ⅰ)NACN是通过吡啶氮和卟啉核共同与银胶作用的,Cu(Ⅰ)NACN是斜向吸附在银表面上的,最佳pH范围在5~6,最佳浓度在大约10~5mol/L;双链DNA和变性DNA的加入不能改变Cu(Ⅰ)NACN在银胶表面上的斜向吸附,在银胶体系中双链DNA的磷酸根通过静电力与Cu(Ⅰ)NACN起弱相互作用,Cu(Ⅰ)NACN可能部分插入变性DNA单链并与之存在同双链DNA一样的静电作用. 展开更多
关键词 卟啉 散射谱 脱氧核糖核酸 配合物
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A PIXE METHOD TO STUDY BIOLOGY AT THE DNA LEVEL
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作者 孙永年 曾宪周 +4 位作者 汪训明 黄祖恩 邬显慷 杨福家 谈家祯 《Nuclear Science and Techniques》 SCIE CAS CSCD 1990年第4期198-202,共5页
An external proton beam system with a detection sensitivity of 10 g for ruthenium was used to study DNA. A metal- organic compound tris (4,7- diphenylphenanthroline) ruthenium (Ⅱ) [Ru(DiP)32-] was chosen as a metal m... An external proton beam system with a detection sensitivity of 10 g for ruthenium was used to study DNA. A metal- organic compound tris (4,7- diphenylphenanthroline) ruthenium (Ⅱ) [Ru(DiP)32-] was chosen as a metal marker. The target DNA labeled with Ru (DiP)32- was electrophoresed in an agarose gel and then was analysed by PIXE. The DNA sample with the metal marker showed clearly Ru peaks in the PIXE spectra, while the control showed no Ru peak at all. This method can be used to study biology at the DNA level. 展开更多
关键词 deoxyribonucleic acid (dna) TRIS (4 7- diphenylphenanthroline)ruthenium (Ⅱ) Electrophorese PIXE
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m4C DNA methylation regulates biosynthesis of daptomycin in Streptomyces roseosporus L30 被引量:1
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作者 Jiao-Le Fang Wen-Li Gao +6 位作者 Wei-Feng Xu Zhong-Yuan Lyu Lie Ma Shuai Luo Xin-Ai Chen Xu-Ming Mao Yong-Quan Li 《Synthetic and Systems Biotechnology》 SCIE 2022年第4期1013-1023,共11页
Despite numerous studies on transcriptional level regulation by single genes in drug producing Actinomyces,the global regulation based on epigenetic modification is not well explored.N4-methylcytosine(m4C),an abundant... Despite numerous studies on transcriptional level regulation by single genes in drug producing Actinomyces,the global regulation based on epigenetic modification is not well explored.N4-methylcytosine(m4C),an abundant epigenetic marker in Actinomycetes’genome,but its regulatory mechanism remains unclear.In this study,we identify a m4C methyltransferase(SroLm3)in Streptomyces roseosporus L30 and multi-omics studies were performed and revealed SroLm3 as a global regulator of secondary metabolism.Notably,three BGCs inΔsroLm3 strain exhibited decreased expression compared to wild type.In-frame deletion of sroLm3 in S.roseosporus L30 further revealed its role in enhancing daptomycin production.In summary,we characterized a m4C methyltransferase,revealed the function of m4C in secondary metabolism regulation and biosynthesis of red pigment,and mapped a series of novel regulators for daptomycin biosynthesis dominated by m4C methylation.Our research further indicated that m4C DNA methylation may contribute to a metabolic switch from primary to secondary metabolism in Actinomyces. 展开更多
关键词 n4-methylcytosine dna methyltransferase DAPTOMYCIn Transcriptional regulator Secondary metabolism
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二甲醇-二硝酸-二[1,3-二(苯并咪唑-2)丙烷]合铜(Ⅱ)与DNA的相互作用
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作者 李曦 张志军 +3 位作者 王成刚 胡波 郝莉 刘鹏 《武汉大学学报(理学版)》 CAS CSCD 北大核心 2008年第6期650-654,共5页
采用荧光光谱法、电子吸收光谱法及循环伏安法研究了配合物LCu(Ⅱ)(L=二甲醇-二硝酸-二[1,3-二(苯并咪唑-2)丙烷])与DNA的相互作用.荧光光谱法研究显示,不同浓度的配合物与DNA作用有不同的结合常数及n值,表明配合物与DNA之间呈混合型作... 采用荧光光谱法、电子吸收光谱法及循环伏安法研究了配合物LCu(Ⅱ)(L=二甲醇-二硝酸-二[1,3-二(苯并咪唑-2)丙烷])与DNA的相互作用.荧光光谱法研究显示,不同浓度的配合物与DNA作用有不同的结合常数及n值,表明配合物与DNA之间呈混合型作用模式.加入DNA后电子吸收光谱产生减色效应及红移现象,结合常数K为2.42×103L/mol,表明铜配合物与DNA发生了弱插入作用.循环伏安法研究显示,加入DNA后峰电位明显负移,峰电流下降,表明发生静电作用;而DNA浓度较低(约5.0×10-4mol/L)时,随着DNA浓度的增大峰电位又有相对正移现象,表明可能同时存在弱插入作用.综上所述,配合物LCu(Ⅱ)与DNA发生了弱插入作用和静电作用. 展开更多
关键词 二甲醇-二硝酸-二[1 3-二(苯并咪唑-2)丙烷]合铜(Ⅱ) 脱氧核糖核酸(dna) 混合型作用模 弱插入作用 静电作用
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