3desacetyl cefotaxime lactone

3-Desacetyl Cefotaxime lactone, the active metabolite of Cefotaxime, is derived from its sodium salt form, which is recognized as a third-generation cephalosporin antibiotic.

N-(3-Oxodecanoyl)-L-homoserine lactone (3-Oxo-C10-HSL) functions as a bacterial quorum-sensing signal autoinducer [1].

The compound 3-Oxo-21α-methoxy-24,25,26,27-tetranortirucall-7-ene-23(21)-lactone is a cytotoxic tirucallane C26 triterpenoid that has been extracted from the stem barks of Aphanamixis grandifolia.

Quorum sensing is a regulatory system used by bacteria for controlling gene expression in response to increasing cell density. Controlling bacterial infections by quenching their quorum sensing systems is a promising field of study. The expression of specific target genes, such as transcriptional regulators belonging to the LuxIR family of proteins, is coordinated by the synthesis of diffusible acylhomoserine lactone (AHL) molecules. N-3-oxo-tetradecanoyl-L-homoserine lactone (3-oxo-C14-HSL) is a small diffusible signaling molecule involved in quorum sensing, thereby controlling gene expression and affecting cellular metabolism in bacteria.[1] [2] [3] It appears later than shorter acyl chain AHLs in developing biofilms [4] and, like other long chain 3-oxo-AHLs, stimulates the production of putisolvin, [5] which in turn, inhibits biofilm formation.

N-3-hydroxydecanoyl-DL-Homoserine lactone is a bacterial quorum-sensing molecule.1It activates SdiA (EC50= 0.6 μM), a transcription factor that detects N-acyl homoserine lactones (AHLs), in the 14028/pJNS25 strain ofS. enterica.2 1.Fekete, A., Frommberger, M., Rothballer, M., et al.Identification of bacterial N-acylhomoserine lactones (AHLs) with a combination of ultra-performance liquid chromatography (UPLC), ultra-high-resolution mass spectrometry, and in-situ biosensorsAnal. Bioanal. Chem.387455-467(2007) 2.Janssens, J.C.A., Metzger, K., Daniels, R., et al.Synthesis of N-acyl homoserine lactone analogues reveals strong activators of SdiA, the Salmonella enterica serovar Typhimurium LuxR homologueAppl. Environ. Microb.73(2)535-544(2007)

N-3-Oxo-octanoyl-L-homoserine lactone is a quorum-sensing signal molecule and an autoinducer for *Agrobacterium*.

N-(3-Oxooctanoyl)-DL-homoserine lactone exhibits stereochemistry-dependent growth regulatory activity for roots.

N-3-hydroxyoctanoyl-L-Homoserine lactone, a small diffusible signaling molecule secreted by various bacteria, plays a critical role in quorum sensing—a regulatory system used by bacteria to control gene expression according to cell density changes. This compound is generated via lactonolysis from 3-oxooctanoyl-homoserine lactone and can either activate or suppress gene expression and biofilm formation. Its production and function vary within the bacterial population growth phases, consequently mediating distinct cellular effects through alterations in gene expression, hence contributing to either quorum sensing or quenching.

N-(3-Oxobutanoyl)-L-homoserine lactone (3-oxo-C4-HSL) serves as an autoregulator for carbapenem antibiotic biosynthesis in Erwinia carotovora ATCC 39048 and induces the expression of rhiI in R. leguminosarum [1].

N-(3-hydroxy-7-cis tetradecenoyl)-L-Homoserine lactone is a long-chain N-acyl-homoserine lactone (AHL) produced by some Gram-negative bacteria and is involved in quorum sensing. Quorum sensing enables bacteria to change gene expression based on cues from nearby bacteria and from eukaryotic hosts about nutrients, environmental conditions, or threats. Due to the benefit of quorum sensing for bacterial survival, quorum sensing molecules are potential targets for controlling bacterial infections. In mouse and human leukocyte immunoassays using LPS-stimulated macrophages, N-(3-hydroxy-7-cis tetradecenoyl)-L-homoserine lactone did not have an effect on cytokine or antibody production.

N-3-oxo-dodecanoyl-L-Homoserine lactone (3-oxo-C12-HSL), a quorum-sensing signaling molecule synthesized by P. aeruginosa and specific B. cepacia complex strains [1][2], facilitates bacterial gene expression modulation in response to cell density escalation and triggers IL-8 production in 16HBE human bronchial epithelial cells [3].

Quorum sensing is a regulatory system used by bacteria for controlling gene expression in response to increasing cell density. Different quorum sensing molecules are produced at different times in bacterial population growth and have distinct cellular effects mediated through changes in gene expression. N-3-hydroxydecanoyl-L-Homoserine lactone is a small diffusible signaling molecule secreted by various bacteria. This lactone is produced via lactonolysis from 3-oxodecanoyl-homoserine lactone, altering quorum sensing or contributing to quorum quenching.

6-Deoxy-3-O-methyl-β-allopyranosyl (1→4)-β-cymaronic acid δ-lactone is a natural product from Marsdenia tenacissima

N-3-oxo-hexadecanoyl-L-Homoserine lactone is an unusual, substituted, long-chain N-acyl-homoserine lactone (AHL) produced by some bacteria, including strains of Agrobacterium vitis and Pseudomonas. Like other AHLs, this C16-containing form is thought to be involved in quorum sensing. Substituted, long-chain AHLs, including N-3-oxo-tetradecanoyl-L-homoserine lactone , prime for systemic acquired resistance to pathogen attack in plants.

N-3-oxo-pentanoyl-L-Homoserine lactone is a chain-shortened derivative of the bacterial quorum sensing signaling molecule N-3-oxo-octanoyl-L-homoserine lactone .1It inhibits binding of the autoinducer N-3-oxo-hexanoyl homoserine lactone toE. colicontaining the transcription factor LuxR when used at a concentration of 230 nM.2It acts as an autoinducer to activate theV. fischeriluminescence system inE. coliwhen used at concentrations ranging from 20 to 200 nM. 1.Chhabra, S.R., Stead, P., Bainton, N.J., et al.Autoregulation of carbapenem biosynthesis in Erwinia carotovora by analogues of N-(3-oxohexanoyl)-L-homoserine lactoneJ. Antibiot. (Tokyo)46(3)441-454(1993) 2.Schaefer, A.L., Hanzelka, B.L., Eberhard, A., et al.Quorum sensing in Vibrio fischeri: Probing autoinducer-LuxR interactions with autoinducer analogsJ. Bacteriol.178(10)2897-2901(1996)

N-(3-Hydroxytetradecanoyl)-DL-homoserine lactone [has antibacterial activity].