RRC ID 58990
著者 Xu J, Lee JM, Tatsuke T, Ebihara T, Masuda A, Hino M, Morokuma D, Fujita R, Mon H, Kusakabe T, Takahashi M.
タイトル Expression and Purification of Vaccinia Virus DNA Topoisomerase IB Produced in the Silkworm-Baculovirus Expression System.
ジャーナル Mol Biotechnol
Abstract Type IB DNA topoisomerases are enzymes to change the topological state of DNA molecules and are essential in studying replication, transcription, and recombination of nucleic acids in vitro. DNA topoisomerase IB from Vaccinia virus (vTopIB) is a 32 kDa, type I eukaryotic topoisomerase, which relaxed positively and negatively supercoiled DNAs without Mg2+ and ATP. Although vTopIB has been effectively produced in E. coli expression system, no studies remain available to explore an alternative platform to express recombinant vTopIB (rvTopIB) in a higher eukaryote, where the one can expect post-translational modifications that affect the activity of rvTopIB. Here in this study, rvTopIB with N-terminal tags was constructed and expressed in a silkworm-baculovirus expression vector system (silkworm-BEVS). We developed a simple two consecutive chromatography purification to obtain highly pure rvTopIB. The final yield of rvTopIB obtained from a baculovirus-infected silkworm larva was 83.25 μg. We also evaluated the activity and function of rvTopIB by the DNA relaxation activity assays using a negatively supercoiled pUC19 plasmid DNA as a substrate. With carefully assessing optimized conditions for the reaction buffer, we found that divalent ions, Mg2+, Mn2+, Ca2+, as well as ATP stimulate the DNA relaxation activity by rvTopIB. The functional and active form of rvTopIB, together with the yields of the protein we obtained, suggests that silkworm-BEVS would be a potential alternative platform to produce eukaryotic topoisomerases on an industrial scale.
巻・号 61(8)
ページ 622-630
公開日 2019-8-1
DOI 10.1007/s12033-019-00184-4
PII 10.1007/s12033-019-00184-4
PMID 31165966
MeSH Animals Baculoviridae / genetics Bombyx / metabolism Bombyx / virology DNA Topoisomerases, Type I / chemistry DNA Topoisomerases, Type I / genetics DNA Topoisomerases, Type I / isolation & purification* DNA Topoisomerases, Type I / metabolism Magnesium / chemistry Recombinant Proteins / chemistry Recombinant Proteins / genetics Recombinant Proteins / isolation & purification* Recombinant Proteins / metabolism Vaccinia virus* / enzymology Vaccinia virus* / genetics Viral Proteins / chemistry Viral Proteins / genetics Viral Proteins / isolation & purification* Viral Proteins / metabolism
IF 2.022
引用数 1
リソース情報
カイコ f38