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Nucleic Acids Research, 1980, Vol. 8, No. 23 5859-5873
© 1980

MOLECULAR BIOLOGY

Two classes of Mu lig mutants: the thermosensitives for integration and replication and the hyperproducers for ligase

L. Paolozzi*, P. Ghelardini**, J.C. Liebart{dagger}, A. Capozzoni* and C. Marchelli*

*Centro Acidi Nucleici **Laboratorio di Biologia Cellulare cel C.N.R. via Romagnosi 18A, Roma, Italy {dagger}Unité de Physiologie de la Réplication, Institut Pasteur 75724 Paris Cedex 15, France

Received September 15, 1980. We have previously shown that Mu restores an active DNA replication at non-permissive temperature in E. coli K12 ligts7 strains.

In this paper we describe two new types of phage mutants for the Mu lig functions. The Mu ligts mutants are conditional lethals defective for both integration and replication of DNA, unable to ‘complement’ the bacterial lig mutation; they map between B and lys. The mutants of the other type, on the other hand, are able to restore to a maximum level the activity impaired by the ligts7 mutation in the host.

We suggest the hypothesis that the product of Mu lig gene could be part of a complex as a topoisomerase.


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