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pubmed-article:9675111pubmed:abstractTextSynthetic genes are very useful in genetic and protein engineering. Here we propose a general method for construction of synthetic genes. Short oligonucleotides are joined through ligase chain reaction (LCR) in high stringency conditions to make "unit fragments" which are then fused to form a full-length gene sequence by polymerase chain reaction. The procedure is simple and accurate and does not place constraints on sequence and length. In this report, a recombinant leptin gene was synthesized according to the codon preference of Escherichia coli. Besides, a substitution of the only Met at position 54 for Leu and an addition of a Met at the N-terminus were introduced in the synthetic gene. The gene was cloned in the pQE-31 expression vector and was expressed in E. coli. A large amount of recombinant leptin containing 6 x His tag was produced and purified by Ni-NTA affinity column. Finally, intact leptin-L54 was released after removing the tag by CNBr cleavage at the Met residue.lld:pubmed
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pubmed-article:9675111pubmed:authorpubmed-author:YangW JWJlld:pubmed
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pubmed-article:9675111pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:9675111pubmed:articleTitleGene synthesis by a LCR-based approach: high-level production of leptin-L54 using synthetic gene in Escherichia coli.lld:pubmed
pubmed-article:9675111pubmed:affiliationDepartment of Medical Research, Veterans General Hospital-Taipei, Taiwan, Republic of China. lcau@isc1.vghtpe.gov.twlld:pubmed
pubmed-article:9675111pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9675111pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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