Identification of the 8-kb plasmid p5343 is described in a previous report (14 (link)). Briefly, the plasmidome of background groundwaters at the ORFRC was examined using an optimized alkaline hydrolysis method followed by Illumina sequencing and analysis. Based on sequence coverage, p5343 was determined to be highly abundant in the background wells studied (14 (link)). In the present study, p5343 was synthesized and cloned into the vector pUC57 using the GenBrick synthesis service (GenScript, Piscataway, NJ) for successful propagation in E. coli. The resulting plasmid p5343_UC57 and its sequence are available via Addgene (Addgene ID 126645) and contain an Escherichia coli compatible origin along with an antibiotic marker for propagation and maintenance in the strain E. coli DH10B. Plasmid purifications were performed using the miniprep plasmid extraction kit (Qiagen GmbH, Germany).