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单词 Cloning vector
释义

Cloning vector

英语百科

Cloning vector

Schematic representation of the pBR322 plasmid, one of the first plasmids widely used as a cloning vector.
The pUC plasmid has a high copy number, contains a multiple cloning site, a gene for ampicillin antibiotic selection, and can be used for blue-white screen.
 An LB agar plate showing the result of a blue white screen.   White colonies may contain an insert in the plasmid it carries, while the blue ones are usuccessful clones.

A cloning vector is a small piece of DNA, taken from a virus, a plasmid, or the cell of a higher organism, that can be stably maintained in an organism, and into which a foreign DNA fragment can be inserted for cloning purposes. The vector therefore contains features that allow for the convenient insertion or removal of DNA fragment in or out of the vector, for example by treating the vector and the foreign DNA with a restriction enzyme that creates the same overhang, then ligating the fragments together. After a DNA fragment has been cloned into a cloning vector, it may be further subcloned into another vector designed for more specific use.

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