Document Detail

A gene delivery system based on the N-terminal domain of human toposiomerase I.
MedLine Citation:
PMID:  21406310     Owner:  NLM     Status:  Publisher    
The N-terminal 200 amino acid residues of topoisomerase I (TopoN) is highly positive in charge and has DNA binding activity, without DNA sequence and topological specificity. Here, a fusion protein (6 × His-PTD-TopoN) containing a hexahistidine (6 × His) tag, a membrane penetration domain and TopoN (amino acid 3-200) was designed and developed. The protein can bind to different sizes (3.0-8.0 kb) and forms (circular and linear) of DNA and translocates the bound DNA to the nucleus. The protein also showed low cytotoxicity to GF-1 grouper fish fin cells that were previously very sensitive and difficult to transfect in vitro. Maintaining the hexahistidine tag increased the protein's transfection efficiency in COS7 African green monkey kidney cells and simplified the purification process. The plasmid pEGFP-N1 was delivered into COS7 cells by the protein in ATP- and temperature-dependent manners. The results indicate that the binding ability of TopoN is very useful for DNA delivery and the carrier protein can be expressed in Escherichia coli without removal of the hexahistidine tag.
Yi-An Chen; Hsiao-Che Kuo; Young-Mao Chen; Shin-Yi Huang; Yu-Ru Liu; Su-Ching Lin; Huey-Lang Yang; Tzong-Yueh Chen
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-14
Journal Detail:
Title:  Biomaterials     Volume:  -     ISSN:  1878-5905     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8100316     Medline TA:  Biomaterials     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Laboratory of Molecular Genetics, Institute of Biotechnology, College of Bioscience and Biotechnology, National Cheng Kung University, Tainan 70101, Taiwan; Department of Food Nutrition, Chung Hwa University of Medical Technology, Tainan 71703, Taiwan.
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