Abstract
Full-length RecE and RecT from Rac prophage mediate highly efficient linear–linear homologous recombination that can be used to clone large DNA regions directly from genomic DNA into expression vectors, bypassing library construction and screening. Homologous recombination mediated by Redαβ from lambda phage has been widely used for recombinant DNA engineering. Here we present a protocol for direct cloning and engineering of biosynthetic gene clusters, large operons or single genes from genomic DNA using one Escherichia coli host that harbors both RecET and Redαβ systems. The pipeline uses standardized cassettes for horizontal gene transfer options, as well as vectors with different replication origins configured to minimize recombineering background through the use of selectively replicating templates or CcdB counterselection. These optimized reagents and protocols facilitate fast acquisition of transgenes from genomic DNA preparations, which are ready for heterologous expression within 1 week.
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Acknowledgements
This work was supported by the International ST Cooperation Program of China (ISTCP 2015DFE32850 to J.F.), a Shandong Innovation and Transformation of Achievements Grant (2014ZZCX02601 to Y.Z.) and a Shenzhen Global Experts Innovation and Pioneering Grant (KQCX20120806161031208 to J.F.). Y.Z. is supported by the Recruitment Program of Global Experts in Shandong University. H.W. is supported by the China Postdoctoral Science Foundation (2015T80710) and the Postdoctoral Innovation Program of Shandong Province (201303110). A.F.S. is supported by the TUD Elite University Support the Best program. The authors acknowledge V. Ravichandir's help in proofreading this manuscript.
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H.W., Z.L., R.M., A.F.S., J.F. and Y.Z. designed the experiments. H.W., Z.L., R.J., Y.H., J.Y., X.B. and A.L. performed the experiments. H.W., A.F.S., J.F. and Y.Z. wrote the manuscript with help from all authors.
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R.M., A.F.S. and Y.Z. are shareholders in Gene Bridges GmbH, which holds exclusive rights to the commercialization of both Redαβ and RecET recombineering technologies.
Integrated supplementary information
Supplementary Figure 1 Derivation of pBAC2015.
(a) pBAC2015 was derived from pBACe3.6 by insertion of oriV and removal of a 30 bp repeat and the loxP site. (b) Comparison of direct cloning with pBACe3.6 and pBAC2015. Homology arms to the 37.5 kb Photorhabdus luminescens plu3535-plu3532 gene cluster were added using the method illustrated in Supplementary Figure 2. Most of the colonies obtained with pBACe3.6 were due to intramolecular recombination through the 30 bp repeat. Its removal in pBAC2015 dramatically reduced the unwanted background so that most colonies contained the intended product.
Supplementary Figure 2 Construction of linear BAC direct cloning vectors.
(a) The cassette containing pBR322, amp and ccdB is amplified by two rounds of PCR to attach homology arms to the gene cluster (ha1 and ha2) and pBAC2015 (ha3 and ha4) respectively. (b) The cassette containing pBR322, amp and ccdB is recombined with pBAC2015 by LLHR in RecET expressing CcdB resistant strain, E. coli GBdir-gyrA462. Because the pBR322-amp-ccdB-rpsL plasmid carries the rpsL gene, in addition to ampicillin and chloramphenicol selection, streptomycin selection can be added to eliminate carryover background from the PCR template. The BAC vector is linearized by BamHI digestion to expose the terminal homology arms.
Supplementary Figure 3 Optimization of R6K plasmids with transposition cassette for different hosts.
(a) pR6K-oriT-tnpA-genta is the same as pR6K-oriT-tnpA-kan except the gentamicin resistance gene replaced the kanamycin resistance gene. (b) pR6K-oriT-tnpA-apra is the same as pR6K-oriT-tnpA-kan except for the inclusion of the apramycin resistance gene and the NcoI site. (c) Exchanging the promoter of tnpA via LLHR. Electroporate the BstZ17I digested pR6K-oriT-TnpA-kan plasmid together with a synthetic oligonucleotide, a synthetic DNA or a PCR product into RecET expressing pir strain, E. coli GBdir-pir116, for LLHR. In case of using synthetic oligonucleotides, the homology arms can be as short as 20 nt to ensure the oligonucleotide is not longer than 140 nt.
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Supplementary Figures 1–3, Supplementary Tables 1–3 and Supplementary Notes 1–10 (PDF 764 kb)
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Wang, H., Li, Z., Jia, R. et al. RecET direct cloning and Redαβ recombineering of biosynthetic gene clusters, large operons or single genes for heterologous expression. Nat Protoc 11, 1175–1190 (2016). https://doi.org/10.1038/nprot.2016.054
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DOI: https://doi.org/10.1038/nprot.2016.054
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