pUR222, a vector for cloning and rapid chemical sequencing of DNA

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Abstract
A multipurpose plasmid, pUR222, was constructed. It contains six unique cloning sites (PstI, SalI, AccI, HindII, BamHI and EcoRI) in a small region of its lacZ-gene part. Insertion of foreign DNA into the plasmid can be easily detected. Bacteria harbouring recombinant plasmids generally give rise to w hite colonies, while those containing only vector DNA form blue colonies on indicator plates. Plasmid DNA purified by a rapid method (Birnboim, H. C. and Doly, J. (1979) Nucl. Acids. Res. 7, 1513–1523) can be used for chemical sequencing of the cloned insert DNA. Labeled fragments need not be isolated after cutting with the proper restriction enzymes and are treated directlyaccording to the sequencing protocol of Maxam and Gilbert.