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Molecular Analyses of the Metallothionein Gene Family in Rice (Oryza sativa L.)
Zhou, Gongke,Xu, Yufeng,Li, Ji,Yang, Lingyan,Liu, Jin-Yuan Korean Society for Biochemistry and Molecular Biol 2006 Journal of biochemistry and molecular biology Vol.39 No.5
Metallothioneins are a group of low molecular mass and cysteine-rich metal-binding proteins, ubiquitously found in most living organisms. They play an important role in maintaining intracellular metal homeostasis, eliminating metal toxification and protecting against intracellular oxidative damages. Analysis of complete rice genome sequences revealed eleven genes encoding putative metallothionein (OsMT), indicating that OsMTs constitute a small gene family in rice. Expression profiling revealed that each member of the OsMT gene family differs not only in sequence but also in their tissue expression patterns, suggesting that these isoforms may have different functions they perform in specific tissues. On the basis of OsMT structural and phylogenetic analysis, the OsMT family was classified as two classes and class I was subdivided into four types. Additionally, in this paper we also present a complete overview of this family, describing the gene structure, genome localization, upstream regulatory element, and exon/intron organization of each member in order to provide valuable insight into this OsMT gene family.
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Synthesis of hairpin DNA mediated Au-Ag bimetallic nanomushrooms for antibacterial application
Fu, Jingtai,Huang, Lu,Yu, Zhongning,Zhang, Zhuomin,Li, Gongke Techno-Press 2021 Advances in nano research Vol.11 No.1
Precise control of the synthesis of bimetallic nanoparticles with specific morphology and structure is of great significance due to their excellent catalytic, optical and biological property. DNA molecules are considered as a kind of efficient templates to mediate the precise synthesis of bimetallic nanoparticles with homogeneous morphology due to their specific and controllable structure. In this study specific hairpin DNA strands were successfully utilized as templates to mediate the synthesis of special mushroom-like Au-Ag bimetallic nanoparticles with a high yield of > 90%. Several key factors greatly influencing the precise control of the morphology and UV-Vis characteristics of the proposed Au-Ag nanomushrooms during synthesis were investigated and optimized in detail, including the structure of template DNA, loading amounts of DNA, types of reductant agents and surfactants. Then, the formation mechanism of hairpin DNA mediated Au-Ag nanomushrooms was studied. Finally, the proposed Au-Ag nanomushrooms with good biocompatibility were applied for the antibacterial study by the growth curve of E. coli. The proposed Au-Ag nanomushrooms showed the effective inhibition capability for the growth of E. coli. The results suggested that these DNA mediated Au-Ag nanomushrooms possessed great potential applications for biomedical science in future.
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