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Pathway Description
Ara operon Inactivation (Negative regulation of araBAD)
Escherichia coli
Category:
Metabolite Pathway
Sub-Category:
Signaling
Created: 2025-06-12
Last Updated: 2025-10-07
When arabinose is absent, cells do not need the araBAD products for breaking down arabinose. Therefore, dimeric AraC acts as a repressor: one monomer binds to the operator of the araBAD gene (araO2), another monomer binds to a distant DNA half site known as araI1. This leads to the formation of a DNA loop. This orientation blocks RNA polymerase from binding to the araBAD promoter. Therefore, transcription of structural gene araBAD is inhibited.
References
Ara operon Inactivation (Negative regulation of araBAD) References
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Pubmed: 20491933
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Pubmed: 7019009
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Pubmed: 7008027
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Pubmed: 6283093
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Pubmed: 6379605
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Pubmed: 2235479
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Pubmed: 323055
Gentry DR, Burgess RR: The cloning and sequence of the gene encoding the omega subunit of Escherichia coli RNA polymerase. Gene. 1986;48(1):33-40. doi: 10.1016/0378-1119(86)90349-5.
Pubmed: 3549461
Sarubbi E, Rudd KE, Xiao H, Ikehara K, Kalman M, Cashel M: Characterization of the spoT gene of Escherichia coli. J Biol Chem. 1989 Sep 5;264(25):15074-82.
Pubmed: 2549050
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Pubmed: 7686882
Ovchinnikov YuA, Monastyrskaya GS, Gubanov VV, Guryev SO, Salomatina IS, Shuvaeva TM, Lipkin VM, Sverdlov ED: The primary structure of E. coli RNA polymerase, Nucleotide sequence of the rpoC gene and amino acid sequence of the beta'-subunit. Nucleic Acids Res. 1982 Jul 10;10(13):4035-44. doi: 10.1093/nar/10.13.4035.
Pubmed: 6287430
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Pubmed: 6278450
Blattner FR, Burland V, Plunkett G 3rd, Sofia HJ, Daniels DL: Analysis of the Escherichia coli genome. IV. DNA sequence of the region from 89.2 to 92.8 minutes. Nucleic Acids Res. 1993 Nov 25;21(23):5408-17. doi: 10.1093/nar/21.23.5408.
Pubmed: 8265357
Ovchinnikov YA, Monastyrskaya GS, Gubanov VV, Guryev SO, Chertov OYu, Modyanov NN, Grinkevich VA, Makarova IA, Marchenko TV, Polovnikova IN, Lipkin VM, Sverdlov ED: The primary structure of Escherichia coli RNA polymerase. Nucleotide sequence of the rpoB gene and amino-acid sequence of the beta-subunit. Eur J Biochem. 1981 Jun 1;116(3):621-9. doi: 10.1111/j.1432-1033.1981.tb05381.x.
Pubmed: 6266829
Blattner FR, Plunkett G 3rd, Bloch CA, Perna NT, Burland V, Riley M, Collado-Vides J, Glasner JD, Rode CK, Mayhew GF, Gregor J, Davis NW, Kirkpatrick HA, Goeden MA, Rose DJ, Mau B, Shao Y: The complete genome sequence of Escherichia coli K-12. Science. 1997 Sep 5;277(5331):1453-62. doi: 10.1126/science.277.5331.1453.
Pubmed: 9278503
Cossart P, Gicquel-Sanzey B: Cloning and sequence of the crp gene of Escherichia coli K 12. Nucleic Acids Res. 1982 Feb 25;10(4):1363-78. doi: 10.1093/nar/10.4.1363.
Pubmed: 6280141
Aiba H, Fujimoto S, Ozaki N: Molecular cloning and nucleotide sequencing of the gene for E. coli cAMP receptor protein. Nucleic Acids Res. 1982 Feb 25;10(4):1345-61. doi: 10.1093/nar/10.4.1345.
Pubmed: 6280140
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