Variants of a cloned synthetic lactose operator. I. A palindromic dimer lactose operator derived from one stand of the cloned 40-base pair operator

Gene
J L Betz, J R Sadler

Abstract

Starting with one strand of the 40-bp synthetic operator (Sadler et al., 1978), we have constructed and cloned a 66-bp, palindromic DNA segment with the following sequence (Formula: see text), where the horizontal arrows indicate the locations of the two 21-bp "core" operator sequences in this segment and the vertical arrow designates the dyad axis of symmetry. Upon denaturation and rapid renaturation, each strand of this fragment forms a hairpin molecule still retaining an EcoRI cohesive end. Two hairpin molecules can be joined with T4 DNA ligase to form a duplex DNA molecule having no ends (dumbbell form A). Denaturation and rapid renaturation of dumbbell A yields a mixture of two dumbbell forms: dumbbell A which is a substrate for Eco RI, and a new form, dumbbell B, which is not a substrate. Each of the conformations of this DNA fragment have been purified and all are active in binding lactose repressor in vitro.

Citations

Oct 1, 1984·Journal of Biomolecular Structure & Dynamics·R Nussinov, G G Lennon
Feb 1, 1991·Journal of Biomolecular Structure & Dynamics·D B Naritsin, Lyubchenko YuL
May 2, 1983·European Journal of Biochemistry·F BuckW E Hull
May 9, 2002·Mutation Research·Vera I HashemRichard R Sinden
Oct 23, 2009·Journal of Virology·Cristina SuárezJavier M Rodríguez
Apr 1, 1993·Mutation Research·E BalbinderM Meyer

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