Structure and genetics of the lactose operon repressor

M. A. Kercher, G. Chang, Nancy C Horton, P. Lu, J. H. Miller, H. C. Pace, M. Lewis

Research output: Contribution to journalArticle

Abstract

The lac operon of E. coli is the paradigm for gene regulation. The key component of the operon is the lac repressor, a product of the lacI gene. The 3-dimensional structures of the intact lac repressor, the lac repressor bound to the gratuitous inducer isopropyl-1-D-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 the framework for understanding a wealth of biochemical and genetic information. A comprehensive site specific substitution analysis on the lac repressor protein has resulted in over four thousand single amino acid replacements of known phenotype between codons 2 through 329 of the lacI gene. We have made an initial correlation of the site-specific mutational analysis with the 3-dimensional structures. In addition, 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 is involved in the quaternary formation of repression loops in which one tetrameric repressor interacts simultaneously with two sites on the genomic DNA.

Original languageEnglish (US)
JournalFASEB Journal
Volume10
Issue number6
StatePublished - 1996
Externally publishedYes

Fingerprint

Lac Repressors
Lac Operon
Genetic Structures
operon
Lactose
lactose
DNA
genes
Base Pairing
operator regions
Genes
codons
Cyclic AMP Receptor Protein
Thiogalactosides
Repressor Proteins
DNA sequences
Operon
metabolites
Escherichia coli
genomics

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Cell Biology

Cite this

Kercher, M. A., Chang, G., Horton, N. C., Lu, P., Miller, J. H., Pace, H. C., & Lewis, M. (1996). Structure and genetics of the lactose operon repressor. FASEB Journal, 10(6).

Structure and genetics of the lactose operon repressor. / Kercher, M. A.; Chang, G.; Horton, Nancy C; Lu, P.; Miller, J. H.; Pace, H. C.; Lewis, M.

In: FASEB Journal, Vol. 10, No. 6, 1996.

Research output: Contribution to journalArticle

Kercher, MA, Chang, G, Horton, NC, Lu, P, Miller, JH, Pace, HC & Lewis, M 1996, 'Structure and genetics of the lactose operon repressor', FASEB Journal, vol. 10, no. 6.
Kercher MA, Chang G, Horton NC, Lu P, Miller JH, Pace HC et al. Structure and genetics of the lactose operon repressor. FASEB Journal. 1996;10(6).
Kercher, M. A. ; Chang, G. ; Horton, Nancy C ; Lu, P. ; Miller, J. H. ; Pace, H. C. ; Lewis, M. / Structure and genetics of the lactose operon repressor. In: FASEB Journal. 1996 ; Vol. 10, No. 6.
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AU - Lewis, M.

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