How To Use Operon In A Sentence
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Functions encoded by the operon appear to be essential for the phagosomal escape and intracellular growth, since disruptions or deletions of FPI encoded genes of the low virulent strains
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The lac operon is an inducible operon, whereas the trp operon is a repressible operon.
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Now, an operon is a little segment of DN A in a bacteria which codes for a couple of genes, and genes code for proteins, and the proteins usually have related functions or function as a group, and one of them is called the lac operon which is used to, the proteins of which are necessary for the bacterium Escherichia coli to metabolize a sugar called lactose, which is a milk sugar.
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This can be achieved by changing the expression of a single sugar-specific repressor, causing a sugar-specific operon to become more or less inducible.
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In negative inducible operons, a regulatory repressor protein is normally bound to the operator and it prevents the transcription of the genes on the operon.
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We found that modulation of regulator activity by its operon partner can lead to overall negative feedback to result from autoactivation.
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Presumably the T2SS and glycolate operon were present in the common ancestor and lost in the O157: H7 lineage.
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The second operon encodes a phosphatase, an epimerase and the thiamine pyrophosphokinase (TPK).
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A lower intensity of mutagenesis can explain all observed revertants if each mutagenized cell has multiple copies of the lac operon.
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Brackets denote operon boundaries and arrows indicate the direction of transcription of each gene.
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Despite the absence of operons, eukaryotes are still capable of a very fine level of control over gene transcription.
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Mutations in the gene mexR coding for the repressor protein result in reduced affinity for the promoter target and upregulation of the mexAB-oprM operon.
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The transcription of the operon is coordinately repressed in the presence of excess pyrimidine nucleotides.
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In bacteria, these genes are clustered in operons, while in eukaryotes, they are widely dispersed throughout the genome.
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It includes the flu gene and a gene cluster for a T2SS, both with a potential role in pathogenesis, and a glycolate operon.
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SpGH38 lies on an operon that also contains the GH84 hexosaminidase
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Starvation for histidine derepresses the entire operon, the longest then known.
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In addition to the lac operon, a number of other synthetic and natural genetic circuits have been analyzed for robustness and evolvability.
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Other events are correlated with the stable exploration of new niches, like the acquisition of the lac operon by E. coli or pathogenicity islands by Salmonella.
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However, because in this case transferred genes as a group must provide an immediate benefit to the host, selfish operon model would require grouping and cotransfer of multiple genes involved in flagellar assembly and would therefore not explain emergence of selective pairing between chemotaxis genes.
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This is a figure again taken from that biochemistry textbook by Voet and Voet discussing a system called the lac operon.
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This system is probably still the best-understood regulatory system in eukaryotic biology and today is taught in every textbook of genetics and cell biology, alongside the lysis-lysogeny decision of and the lac operon of E. coli.
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It has been noted that coexpressed genes are frequently situated as contiguous clusters within an operon.
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Horizontal transfer of whole genes and operons between divergent species is a frequent event.
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Our results indicate that, for example, gene apxIVA from an operon coding for RTX toxin ApxIV is highly up-regulated in vivo, and that two genes from the operon coding for type IV fimbriae (APL_0878 and APL_0879) were also up-regulated.
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Jarrell 2007 Systematic deletion analyses of the fla genes in the flagella operon identify several genes essential for proper assembly and function of flagella in the archaeon, Methanococcus maripaludis.
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This region contains four iron acquisition systems (iutA iucABCD, sitABCD, iroBCDN and temperature-sensitive hemagglutinin tsh), colicin V operon, increasing serum sensitivity iss
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Jacob and Monod called these regulated stretches of DNA operons.
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A putative virulence region spanning an 80-kb region of pAPEC-1 possesses four iron acquisition systems (iutA iucABCD, sitABCD, iroBCDN, and temperature-sensitive hemagglutinin tsh), a colicin V operon, increasing serum sensitivity iss, ompT, hlyF, and etsABC.
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