This page contains various information relating to vectors used in the Endy lab and other Synthetic Biology labs.
Stringent vs. relaxed replication
Plasmid replication control is usually controlled by balancing the levels of a positive and a negative regulator of replication. For some plasmids (pMB1/colE1 replicons) the positive regulator is an RNA and in others (e.g. pSC101) it is a protein. Plasmids with a protein positive regulator will not replicate in the abscence of protein production - stringent control (although not the same as the stringent response due to a shortage of loaded tRNAs). Plasmids with an RNA positive regulator will continue to replicate in the abscence of protein production. This is termed relaxed control. High yields of plasmid may be obtained by halting protein production (via chloroamphenicol) when the culture reaches a high density and then continuing incubation for a number of hours. This might be of practical relevance when prepping the 1 and 3 series of Synthetic Biology plasmids.--BC 19:05, 3 Sep 2005 (EDT)
PlasMapper: "automatically generates and annotates plasmid maps using only the plasmid DNA sequence as input. Plasmid sequences up to 20,000 bp may be annotated and displayed. Plasmid figures may be rendered in PNG, JPG, SVG or SVGZ format." It can also output GenBank format. Reference: Xiaoli Dong, Paul Stothard, Ian J. Forsythe, and David S. Wishart "PlasMapper: a web server for drawing and auto-annotating plasmid maps" Nucleic Acids Res. 2004 Jul 1;32(Web Server issue):W660-4.
- One drawback to this tool is that although it finds ORFs, it doesn't necessarily identify them. -- RS
Also check out APe, A Plasmid Editor.
The following are groups of replicons that can be used with the bold replicon in the one cell.
- colE1 - p15A,R6K, and F
- pMB1 - p15A,R6K, and F
Note: searching for cloning vector <insert vector name> when looking for vector sequences in NCBI Entrez Nucleotide search. It helps to cut down on the number of hits.