Mutational effect of the “-35” element of sorghum psbA gene promoter  

作　　者：Wu, NH Fan, TS Ren, DL 

机构地区：[1]Chinese Acad Sci, Inst Dev Biol, Beijing 100080, Peoples R China

出　　处：《Chinese Science Bulletin》1999年第16期1474-1480,共7页

摘　　要：Mutations of the first position T and the third position G in TTGACA, the ' - 35' element of sorghum psbA gene promoter, were induced using chemically synthesized 20 nt oligonucleotide primer. Three mutants were produced: ATTACA, GTGACA, and ATGACA. Then the protein binding affinity of the mutants and the wild type sorghum psbA gene promoter was tested in a spinach chloroplast protein extract system. Gel retardation assay of theMutations of the first position T and the third position G in TTGACA, the ' - 35' element of sorghum psbA gene promoter, were induced using chemically synthesized 20 nt oligonucleotide primer. Three mutants were produced: ATTACA, GTGACA, and ATGACA. Then the protein binding affinity of the mutants and the wild type sorghum psbA gene promoter was tested in a spinach chloroplast protein extract system. Gel retardation assay of the wild type showed a strong protein-binding band. On the other hand, the protein-binding band of the mutant resulting from single base mutation, ATGACA or GTGACA, showed reduced intensity, while that of the mutant resulting from double base mutation, ATTACA, showed increased intensity. It is thus shown that the ' - 35' element plays an important role in controlling the binding between psbA gene promoter and the specific chloroplast proteins; mutation of a single base may exert a substantial influence on the binding affinity.

关 键 词：SORGHUM ( SORGHUM valgare P.) PSBA gene 5’-noncodlng region SITE-SPECIFIC MUTAGENESIS expression control. 

分 类 号：S514[农业科学—作物学]