a. baumannii

Durlobactam sodium salt (ETX2514 sodium salt) is an inhibitor of β-lactamase with IC50 values of 4 nM, 14 nM, and 190 nM for Class A KPC-2, Class C AmpC, and Class D OXA-24, respectively. Durlobactam sodium salt can be used in studies about drug-resistant Gram-negative bacteria including Acinetobacter baumannii.

Colistin (Polymyxin E), a polypeptide antibiotic with oral activity, exhibits strong efficacy against a range of Gram-negative rod-shaped bacteria, such as multidrug-resistant Pseudomonas aeruginosa, Acinetobacter baumannii, and Klebsiella pneumoniae. However, its use is associated with nephrotoxicity. It is primarily utilized in researching infections caused by Gram-negative bacilli [1] [2].

DNA gyrase B-IN-2 (Compound E), a 2-aminobenzothiazole derivative, serves as a potent inhibitor of DNA gyrase B with substantial efficacy against ESKAPE pathogens. The compound exhibits potent nanomolar-range inhibition (IC 50 < 10 nM) and a broad-spectrum antibacterial effect, with minimum inhibitory concentrations below 0.03 μg/mL for most Gram-positive species and between 4–16 μg/mL for Gram-negative species including E. coli, Acinetobacter baumannii, Pseudomonas aeruginosa, and Klebsiella pneumoniae. DNA gyrase B-IN-2 is applicable in infection research [1].

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].

Antibacterial agent 116, a benzophenone-containing salicylanilide compound, exhibits potent antibacterial activity by inhibiting peptidoglycan formation. It is employed as a photoaffinity probe to label Acinetobacter baumannii penicillin-binding protein (PBP1b), thereby blocking the propagation pathway and disrupting the growth of the peptidoglycan chain.

DS86760016 is a highly effective inhibitor of leucyl-tRNA synthetase (LeuRS), demonstrating potent activity against multidrug-resistant (MDR) Gram-negative bacteria including Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa. Notably, DS86760016 effectively inhibits LeuRS enzymes derived from Escherichia coli, Pseudomonas aeruginosa, and Acinetobacter baumannii, exhibiting IC50 values of 0.38 μM, 0.62 μM, and 0.16 μM, respectively.

Benastatin B is a polyketide synthase-derived benastatin that has been found in Streptomyces and has diverse biological activities. It inhibits glutathione S-transferase (GST; Ki = 3.7 µM for the rat liver enzyme).2 Benastatin B also inhibits the transglycosylase activity of A. baumannii, C. difficile, E. coli, and S. aureus recombinant penicillin-binding proteins (PBPs; IC50s = 16, 53.3, 30.7, and 31.6 µM, respectively).3 It is active against several bacteria, including methicillin-resistant S. aureus (MRSA; MIC = 3.12 µg/ml).

Tigecycline mesylate is a first-in-class, broad-spectrum antibiotic. It also has activity against antibiotic-resistant organisms.

P1 is a broad-spectrum antimicrobial peptide exhibiting antibacterial activity against both Gram-positive and Gram-negative bacteria, including B. anthracis spores and Carbapenem-resistant strains of A. baumannii and K. pneumoniae [1].

Polymyxin B2, a significant component of polymyxin B, is an antibiotic cationic lipopeptide initially derived from B. polymyxa. This compound effectively inhibits P. aeruginosa, A. baumannii, K. pneumoniae, and E. cloacae strains, exhibiting minimum inhibitory concentrations (MICs) of 1-2, 0.5-1, 0.25-0.5, and 0.25-1 µg/ml, respectively. Notably, in a mouse model of P. aeruginosa bloodstream infection, administration of polymyxin B2 at a dosage of 4 mg/kg has been shown to decrease the number of colony-forming units (CFUs) in the blood.

Tigecycline (GAR-936) is a broad-spectrum glycylcycline antibiotic derived from tetracycline. Tigecycline binds to the 30S ribosomal subunit, thereby interfering with the binding of aminoacyl-tRNA to the mRNA-ribosome complex.

TP-6076 is a fluorocycline antibiotic, inhibiting bacterial protein synthesis, exhibiting great antimicrobial activity against carbapenem-resistant A. baumannii.

Tigecycline hydrochloride is a first-in-class, broad-spectrum antibiotic. It also has activity against antibiotic-resistant organisms.

DS-8587 is a DNA topoisomerase inhibitor. DS-8587 exhibits potent antibacterial activity against quinolone-resistant A. baumannii isolates that harbor mutations in quinolone resistance-determining regions. DS-8587 significantly reduces the number of viabl

SPR206 acetate is a polymyxin analog that exhibits antibiotic activity against Gram-negative pathogens, including multidrug-resistant (MDR) variants. By interacting with the outer membrane of the bacterium, SPR206 acetate effectively combats bacterial infections. Notably, SPR206 acetate demonstrates significant efficacy with minimum inhibitory concentration (MIC) values of 0.125 mg/L against Pseudomonas aeruginosa Pa14 and Acinetobacter baumannii NCTC13301.

APO-6619 is an iron chelator which was shown to inhibit growth of the following bacterial strains: Acinetobacter baumannii, Pseudomonas aeruginosa, Staphylococcus aureus, Klebsiella pneumoniae, and Escherichia coli. APO-6619 may be useful as a non-traditional treatment of bacterial infections.

Antibacterial Agent 135 (example 7) effectively inhibits various bacteria, including P. aeruginosa, A. baumannii, E. coli, and K. pneumoniae, with a minimum inhibitory concentration (MIC) greater than 64 μg/mL [1].

Histatin 8, a salivary antimicrobial peptide derived from proteolytic fragments of histatin 3 and histatin 5, exhibits activity against A. baumannii strains, both colistin-susceptible and -resistant, at a concentration of 32 µg/ml. Additionally, it is effective against C. albicans and C. tropicalis, with minimum inhibitory concentrations (MICs) of 1 and 5 mg/ml, respectively.

SAAP 148, an antimicrobial peptide, effectively combats various multidrug-resistant bacteria in vitro and, in vivo, reduces skin colony-forming units (CFUs) in mouse models of A. baumannii or methicillin-resistant S. aureus (MRSA) infections at concentrations ranging from 0.125-2% w/w.

Cyclo-L-Trp-L-Trp is a broad-spectrum antifungal. It also induces a high degree of acetylation of histones.

Tigecycline-d9 is a deuterated compound of Tigecycline. Tigecycline has a CAS number of 220620-09-7. Tigecycline is a broad-spectrum glycylcycline antibiotic derived from tetracycline. Tigecycline binds to the 30S ribosomal subunit, thereby interfering with the binding of aminoacyl-tRNA to the mRNA-ribosome complex.

Tigecycline hydrate (GAR-936 hydrate) is a broad spectrum glycylcycline antibiotic. Tigecycline hydrate is bacteriostatic, that inhibits protein synthesis by binding to the 30S ribosomal subunit of bacteria and thereby blocking entry of Aminoacyl-tRNA into the A site of the ribosome during prokaryotic translation. Tigecycline hydrate is active against resistant strains of Gram-positive and Gram-negative bacteria .

Polymyxin B2 is an antibiotic primarily utilized for resistant Gram-negative infections. It is derived from the bacterium Bacillus polymyxa.