A DNA Bubble-Mediated Gene Regulation System Based on Thrombin-Bound DNA Aptamers.
We describe here a novel approach to enhance the transcription of a target gene in cell-free systems by symmetrically introducing duplex aptamers upstream to a T7 promoter in both the sense and antisense strands of double-stranded plasmids, which leads to the formation of a DNA bubble due to the none-complementary state of the ssDNA region harboring the aptamer sequences. With the presence of thrombins, the DNA bubble would be enlarged due to the binding of aptamers with thrombins. Consequently, the recognition region of the promoter contained in the DNA bubble can be more easily recognized and bound by RNA polymerases, and the separation efficiency of the unwinding region can also be significantly improved, leading to the enhanced expression of the target gene at the transcriptional level. The effectiveness of the proposed gene regulation system was demonstrated by enhancing the expression of gfp and ecaA genes in cell-free systems.
School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , Atlanta, 30332, United States.
Jing
J
Wang
School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , Atlanta, 30332, United States.
Le
L
Yang
Xun
X
Cui
School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , Atlanta, 30332, United States.
Zhe
Z
Zhang
Lichun
0000-0002-9876-0133
L
Dong
School of Chemical and Biomolecular Engineering, Georgia Institute of Technology , Atlanta, 30332, United States.
Ningzi
N
Guan
D052157:Aptamers, Nucleotide / Q000235:genetics*; D015374:Biosensing Techniques / Q000379:methods; D005786:Gene Expression Regulation / Q000235:genetics; D011401:Promoter Regions, Genetic / Q000235:genetics; D013917:Thrombin / Q000378:metabolism*
D052157:Aptamers, Nucleotide; D013917:Thrombin
DNA bubble; aptamer; gene expression regulation; promoter