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The blue–white screen is a screening technique that allows for the rapid and convenient detection of recombinant bacteria in vector-based molecular cloning experiments. This method of screening is usually performed using a suitable bacterial strain , but other organisms such as yeast may also be used.
This allows for blue–white screening when using host strains such as E. coli JM109, which produces only the C-terminal portion of lacZ, also known as the β-polypeptide. [3] If pUC19 is inserted into E. coli JM109 and grown on agar media supplemented with IPTG and X-gal , then colonies will appear blue, as the plasmid encodes for the α ...
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In blue-white screen, IPTG is used together with X-gal. Blue-white screen allows colonies that have been transformed with the recombinant plasmid rather than a non-recombinant one to be identified in cloning experiments. [citation needed] [5]
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DH5-Alpha Cells are E. coli cells engineered by American biologist Douglas Hanahan to maximize transformation efficiency. They are defined by three [1] mutations: recA1, endA1 which help plasmid insertion and lacZΔM15 which enables blue white screening.
Such features present in cloning vectors may be the lacZα fragment for α complementation in blue-white selection, and/or marker gene or reporter genes in frame with and flanking the MCS to facilitate the production of fusion proteins. Examples of fusion partners that may be used for screening are the green fluorescent protein (GFP) and ...
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