Gram-positive bacterium

Smart-Gram-positive bacterium** refers to a broad class of bacteria that retain the crystal violet stain in the Gram staining procedure due to their thick peptidoglycan cell wall[8][1][5]. This group is defined by structural features such as a cytoplasmic lipid membrane, a thick peptidoglycan layer, and teichoic acids within the cell wall[8]. They lack an outer membrane found in gram-negative bacteria. The classification includes two major groups based on DNA G+C content: high G+C (Actinobacteria) and low G+C (Bacilli)[1][5]. Gram-positive bacteria are not a single molecular target but rather an entire category of organisms. As such, they are not considered a specific therapeutic target like an enzyme or receptor; instead, various molecular components within these bacteria—such as enzymes involved in cell wall synthesis or quorum-sensing systems—are targeted for antimicrobial therapy[7][3]. Common pathogens include Staphylococcus aureus, Streptococcus species, and Enterococcus species. Therapeutics against gram-positive infections often exploit differences in their cell envelope structure. Drugs like vancomycin and beta-lactams inhibit peptidoglycan cross-linking or synthesis[2][9], while newer agents may target other essential bacterial processes. Resistance among gram-positive pathogens is clinically significant; examples include methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci (VRE)[2]. Because "Gram-positive bacterium" describes an entire class rather than a specific molecule or protein target, it is not appropriate as a canonical therapeutic target entry. > “Prokaryotes are identified as gram‐positive if they have a multiple layer matrix of peptidoglycan forming the cell wall... Microbiologists currently recognize two distinct groups of gram‐positive... prokaryotes.”[1] > “In bacteriology, **gram‐positive bacteria** are bacteria that give a positive result in the Gram stain test... have a thick layer of peptidoglycan within the cell wall...”[8] > “Sortase appears to be a very promising target for identifying inhibitors that could be of general use in therapeutics against Gram‐positive bacteria.”[7]

Other names

Gram-positive bacteriaGram-positive organismsGram-positive prokaryotes

Inhibition of cell wall synthesis (e.g., by beta-lactams and glycopeptides)[2][9]