How is copy number of plasmid determined?

Plasmid copy number was determined by comparing the quantification signal from the plasmid to those from the chromosome. Copy number was then calculated by using a known copy number plasmid as a standard.

Is my plasmid high or low copy number?

A way to determine experimentally if the copy number of your plasmid is high or low is to perform a miniprep. A high-copy plasmid should yield between 3-5 ug DNA per 1 ml LB culture, while a low-copy plasmid will yield between 0.2-1 ug DNA per ml of LB culture.

What is the average copy number of F plasmid in E coli?

The copy numbers of plasmids containing the RSF1010 and pSC101 replicons (p254-AEB, p274-AEB) were reported to be around 11.2 and 4.2 per chromosome in E. coli [32], respectively. This is higher than the average PCN of 5.2 and 3.4 we determined here, but still in a similar range.

What gene did the plasmid pSC101 carry?

pSC101 is a DNA plasmid that is used as a cloning vector in genetic cloning experiments. pSC101 was the first cloning vector, used in 1973 by Herbert Boyer and Stanley Norman Cohen. They are demonstrated that a gene from a frog could be transferred into bacterial cells and then expressed by the bacterial cells.

How does plasmid control the replication of pSC101?

A similar negative feedback cycle involving the plasmid-encoded RepA protein permits copy number control for pSC101, as RepA not only binds to iterons to initiate replication but, at higher concentrations, RepA binds to inverted repeat sequences present in the RepA promoter to reduce its own expression and thereby the overall replication of pSC101.

How is the copy number of a plasmid controlled?

Relaxed plasmids are generally regulated through one of two mechanisms: antisense RNA or iteron binding groups. Low copy number plasmids, also called stringent plasmids, require tighter control of replication.

Which is the first plasmid vector used for cloning?

Low copy number plasmid from Salmonella. pSC101 was the first plasmid vector used for cloning. To see this sequence with restriction sites, features, and translations, please download SnapGene or the free SnapGene Viewer. Your time is valuable! × Please choose an application for opening sequence files.

When do negative feedback circuits reduce replication of a plasmid?

Once the average copy number for a given plasmid has been reached, negative feedback circuits reduce replication of the plasmid to balance the total plasmid number.