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| 1 | Isolation and functional analysis of a strong specific promoter in photosynthetic tissues显示文摘PNZIP gene promoter has been cloned from Pharbitis nil by adaptor PCR, which con-forms to eukaryotic promoter characteristic. Primer extension analysis showed that the transcrip-tion start site was located 122 nucleotides upstream of the translation start site of PNZIP gene. According to the characteristic of PNZIP promoter, a series of deletions were purposely made by PCR. Five deletion fragments were fused to upstream of GUS gene and transferred into tobacco. Fluorometric GUS assay showed that five different length promoters all could specifically drive GUS gene expression in photosynthetic tissues and their activities decreased along with the gradual deletion of PNZIP promoter. In addition, the activity of full-length promoter was 9 times higher than that of CaMV 35S in leaf. PNZIP promoter may have two putative cis-elements, GAAATA and GATACT, which relate to gene expression in photosynthetic tissues. GATACT may determine the gene specific expression in photosynthetic tissues, while GAAATA, perhaps, as an enhancer, increases the intensity of gene expression. | 杨予涛 杨国栋 刘石娟 郭兴启 郑成超 | 2003 | Science China(Life Sciences)2003，46，6： | 4 |
| 2 | Identification and analysis of ARS function of six plant MARs显示文摘Six plant MARs isolated from tobacco and Arabdiposis were investigated for their ARS activity in yeast. The results showed that among the six plant MARs, only TM1 and AM4 had strong ARS activity which was almost the same as that of ARS from yeast chromosome. In order to further identify the core region of the two MARs for the ARS activity, a series of subclones were created by PCR strategy, and the corresponding subclones were designated as TM1-1, TM1-2, TM1-3, AM4-1, AM4-2 and AM4-3, respectively. Our studies revealed that TMI-3 and AM4-3 not only had higher ARS activity, but also displayed higher transformation frequency, plasmid stability and growth rate compared to their intact MARs, TM1 and AM4. These data present an important clue for further elucidating the relationship between MAR and ARS. | LIHong YANGYutao ZHANGKewei ZHENGChengchao | 2004 | Chinese Science Bulletin2004，49，5： | 1 |
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