e. coli strain

Polymyxin B Sulfate (Poly-RX) is a mixture of polymyxins B1 and B2, obtained from Bacillus polymyxa strains. They are basic polypeptides of about eight amino acids and have cationic detergent action on cell membranes. Polymyxin B Sulfate (Poly-RX) is used for infections with gram-negative organisms, but may be neurotoxic and nephrotoxic.

Neospiramycin I is a macrolide antibiotic and derivative of spiramycin I.1It is active against the macrolide-sensitive KB210, but not the macrolide-resistant KB224, strain ofS. aureus(MICs = 3.12 and >100 μg/ml, respectively), as well asB. cereus,B. subtilis,M. luteus,E. coli, andK. pneumoniae(MICs = 1.56, 3.12, 3.12, 0.2, 50, and 12.5 μg/ml, respectively). Neospiramycin I binds toE. coliribosomes with an IC50value of 1.2 μM. It protects against mortality in a mouse model ofS. pneumoniaetype III infection (ED50= 399.8 mg/kg).2

Oxanosine is an analog of guanosine that has been found in S. capreolus and has diverse biological activities, including antibacterial, antiviral, and anticancer properties. It is active against a variety of bacteria, including S. flexneri, P. mirabilis, and E. coli (MICs = 6.25, 12.5, 25 µg/ml, respectively, on peptone, but not nutrient, agar). Oxanosine inhibits replication of the HIV-1 strain IIIb in infected CEM and U937, but not H9, cells (EC50s = 7, 27, and >500 µg/ml, respectively). It also inhibits the growth of HeLa human cervical cancer cells (IC50 = 32 µg/ml) and reduces tumor growth in a murine L1210 lymphocytic leukemia model.

Tigecycline tetramesylate (GAR-936 tetramesylate), a broad-spectrum glycylcycline antibiotic, exhibits a mean inhibitory concentration (MIC) for E. coli (MG1655 strain) of approximately 125 ng/mL [1]. For Acinetobacter baumannii (A. baumannii), the MIC 50 and MIC 90 values stand at 1 and 2 mg/L, respectively [2].

Majoranaquinone demonstrates potent antibacterial activity against four Staphylococcus strains, one Moraxella strain, and one Enterococcus strain. It also acts as an effective efflux pump inhibitor in Escherichia coli ATCC 25922 and inhibits biofilm formation on both E. coli ATCC 25922 and E. coli K-12 AG100 [1].

2,3-Dihydroxybenzoylserine (2,3-Dihydroxy-N-benzoylserine) is a conjugate of 2,3-dihydroxybenzoic acid and serine. It can be isolated from E. coli cultures. This compound acts as a growth factor with growth-promoting activity in various aromatic auxotrophic bacteria, such as the E. coli K12 strain AB2830. It is a degradation product of biologically active compounds.

p-Nitrophenyl α-L-arabinopyranoside is a biochemical reagent that can be hydrolyzed by recombinant BgaA (rBgaA, isolated from E. coli BL21 (DE3) strain carrying pEBGA29). It has potential applications in enzyme activity assays.