Kinetic characterization of the ATPase activity of the DNA packaging enzyme from bacteriophage .lambda.

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pp. 11992-11997 ◽  
Author(s):  
Mary Ann Tomka ◽  
Carlos Enrique Catalano
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Francisco Assis Leone ◽  
Malson Neilson Lucena ◽  
Luciana Augusto Rezende ◽  
Daniela Pereira Garçon ◽  
Marcelo Rodrigues Pinto ◽  
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Vol 262 (8) ◽  
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R.M. Gould ◽  
B.V. Plapp

Genetics ◽  
1983 ◽  
Vol 104 (4) ◽  
pp. 549-570
Author(s):  
Ichizo Kobayashi ◽  
Mary M Stahl ◽  
David Leach ◽  
Franklin W Stahl

ABSTRACT Chi (5′-GCTGGTGG) is a recombinator in RecA- RecBC-mediated recombination in Escherichia coli. In bacteriophage λ vegetative recombination, Chi is fully active only when it is correctly oriented with respect to cos, the site that defines the ends of the packaged chromosome. Here we demonstrate that packaging from cos is not necessary for this cos-Chi interaction. Our evidence suggests that correctly oriented cos is an activator of Chi. cos, as an activator, is (1) dominant over cos  -, (2) active opposite an extensive heterology, (3) able to interact with Chi only when on the same (cis) chromosome, and (4) able to interact with Chi at distances as far as ≥ 20 kb. Thus, cos and Chi form a two-component recombinator system for general recombination. cos may serve as an asymmetric entry site for a recombination enzyme that recognizes Chi in an asymmetric way.


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