k. pneumonia

Kanamycin sulfate (Kanamycin monosulfate) is an aminoglycoside antibiotic that interferes with protein synthesis by binding to the 70S ribosomal subunit of bacteria. Kanamycin sulfate exhibits antimicrobial activity against both Gram-positive and Gram-negative bacteria, as well as mycoplasmas.

NSC 55655 (5-[(2-Nitrophenyl)methylene]-2,4-thiazolidinedione) possesses antimicrobial and antioxidant activities and inhibits the proliferation of B. subtilis, S. aureus, K. pneumonia, E. coli, S. typhi , A. niger and C. albicans. A. niger and C. albicans, and can be used in diabetes mellitus.

KPC-2-IN-3 (Compound 3b) is a KPC-2 inhibitor with an IC50 of 0.533 μM and a Ki of 0.194 μM. It works synergistically with Meropenem to exhibit antibacterial activity against carbapenem-resistant K. pneumoniae K47-25, reducing bacterial count and demonstrating a post-antibiotic effect. Additionally, KPC-2-IN-3 significantly decreases lung bacterial load in a mouse pneumonia model.

MBL-IN-6 (Compound 6d) is a metal-β-lactamase (MBL) inhibitor with Ki values of 2.6 μM for NDM-1 and 0.08 μM for VIM-2. It acts synergistically with Imipenem against clinical isolates producing MBL, such as E. coli SI-M001, K. pneumoniae T2301, and S. marcescens SI-1591, with a MIC ranging from 2-64 μg/mL. MBL-IN-6 does not induce off-target effects and exhibits no inhibitory activity against ACE-1. This compound is useful for research on antibiotic resistance.

Hirsutide is a cyclotetrapeptide fungal metabolite produced by the entomopathogenic fungus Hirsutella. It has antibacterial activity against C. pyogenes, S. aureus, P. aeruginosa, and K. pneumonia (MICs = 25, 13, 6, and 21 μg/cm3, respectively). Hirsutide also has antifungal activity against C. albicans, M. audouinii, A. niger, and Ganoderma (MICs = 13, 6, 25, and 6 μg/cm3, respectively).

Antibacterial agent 111 (Compound 3) exhibits potent activity against B. cereus and K. pneumonia with MIC values of 3.90 μg/mL and 0.49 μg/mL, respectively, by binding strongly to specific residues of tyrosyl-tRNA synthetase [1].