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Crystal Structure of the Lactose Operon Repressor and Its Complexes with DNA and Inducer

Lewis, Mitchell, Chang, Geoffrey, Horton, Nancy C., Kercher, Michele A., Pace, Helen C., Schumacher, Maria A., Brennan, Richard G., Lu, Ponzy·1996·Science

Abstract

The lac operon of Escherichia coli is the paradigm for gene regulation. Its key component is the lac repressor, a product of the lacI gene. The three-dimensional structures of the intact lac repressor, the lac repressor bound to the gratuitous inducer isopropyl-β-D-1-thiogalactoside (IPTG) and the lac repressor complexed with a 21-base pair symmetric operator DNA have been determined. These three structures show the conformation of the molecule in both the induced and repressed states and provide a framework for understanding a wealth of biochemical and genetic information. The DNA sequence of the lac operon has three lac repressor recognition sites in a stretch of 500 base pairs. The crystallographic structure of the complex with DNA suggests that the tetrameric repressor functions synergistically with catabolite gene activator protein (CAP) and participates in the quaternary formation of repression loops in which one tetrameric repressor interacts simultaneously with two sites on the genomic DNA.

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Metadata

Authors
Lewis, M., Chang, G., Horton, N. C., Kercher, M. A., Pace, H. C., Schumacher, M. A., Brennan, R. G., & Lu, P.
Venue
Science
Published
1996-03
Volume
271
Issue
5253
Pages
1247-1254
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2009217296
Cited by
790
References
0
FWCI
27.28
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Crystal Structure of the Lactose Operon Repressor and Its Complexes with DNA and Inducer. https://app.cochat.ai/papers/10.1126/science.271.5253.1247
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Lewis, M., Chang, G., Horton, N. C., Kercher, M. A., Pace, H. C., Schumacher, M. A., Brennan, R. G., & Lu, P. (1996). Crystal Structure of the Lactose Operon Repressor and Its Complexes with DNA and Inducer. Science. https://doi.org/10.1126/science.271.5253.1247

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.