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Nucleic Acids Research, 1981, Vol. 9, No. 16 4087-4098
© 1981

MOLECULAR BIOLOGY

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

Rüther Ulrich*, Michael Koenen, Karin Otto and Benno Müller-Hill

Institut für Genetik der Universität zu Köln Weyertal 121, 5000 Köln 41, GFR

*To whom correspondence should be addressed.

Received June 22, 1981. 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 lac Z-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.


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