The L-Arabinose Operon in Escherichia coli B/r: A Genetic Demonstration of Two Functional States of the Product of a Regulator Gene

The product of the regulator gene araC in the L-arabinose gene complex exists in two functional states: P1, the repressor, and P2, the activator, presumably in equilibrium with each other, and with P1 and P2 attached to their respective controlling sites, araO, the operator, and araI, the initiator....

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 1969-04, Vol.62 (4), p.1100-1107
Main Authors: Englesberg, Ellis, Squires, Craig, Meronk, Frank
Format: Article
Language:English
Subjects:
Alleles
Amino acids
Arabinose
Biological Sciences: Genetics
Escherichia coli
Genes, Regulator
Genetic equilibrium
Genetic mutation
Haploidy
Methods
Molecular Biology
Operator regions
Operon
Operons
Phenotypes
Regulator genes
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Summary:The product of the regulator gene araC in the L-arabinose gene complex exists in two functional states: P1, the repressor, and P2, the activator, presumably in equilibrium with each other, and with P1 and P2 attached to their respective controlling sites, araO, the operator, and araI, the initiator. The controlling sites are linked in the following order with respect to genes araB and araC: BIOC. Two C gene deletions (Δ 719 and Δ 766) serve to define the newly described araO site, and to place it adjacent to the left end of the C gene. We have suggested that deletion 719 deletes, in addition to the C gene, part or all of the araO site. Deletion 766 leaves the araO site intact. Complementation analysis employing stable merodiploids indicates that the repressor-operator site function is epistatic over the activator-initiator site function. It is necessary both for activator (P2) to be present and for repressor (P1) to be absent at their respective controlling sites (araI and araO) for full expression of the L-arabinose operon.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.62.4.1100