PURPOSE The role of exoproteins in the pathogenesis of Pseudomonas aeruginosa keratitis was investigated in three animal models by assessing the relationship between corneal virulence and the activities of exotoxin A, elastase, alkaline protease, and an uncharacterized protease, protease IV. METHODS The four Pseudomonal strains tested included a prototype strain (ATCC 27853) producing exotoxi...

Streptococcal toxic shock syndrome (STSS) is a highly lethal, acute-onset illness that is a subset of invasive streptococcal disease. The majority of clinical STSS cases have been associated with the pyrogenic toxin superantigens (PTSAgs) streptococcal pyrogenic exotoxin A or C (SPE A or C), although cases have been reported that are not associated with either of these exotoxins. Recent genome ...

It is often presumed that, in vivo, the initiation of RNA synthesis by DNA-dependent RNA polymerases occurs using NTPs alone. Here, using the model Gram-negative bacterium Pseudomonas aeruginosa, we demonstrate that depletion of the small-RNA-specific exonuclease, Oligoribonuclease, causes the accumulation of oligoribonucleotides 2 to ∼4 nt in length, "nanoRNAs," which serve as primers for tran...

Pseudomonas aeruginosa is one of the major pathogens responsible for a wide variety of severe nosocomial and community acquired infections. Numerous vaccine candidates and several monoclonal antibodies have been developed over the past 40 years but only a few have reached clinical trials and none of these vaccine candidates has obtained market authorization. The understanding of P. aeruginosa p...

The research was aimed to demonstrate the frequency of virulence factors genes (exoenzyme S and exotoxin A) express their relationship antibacterial resistance among Pseudomonas aeruginosa isolated from patients suffering otitis externa. results were revealed that only twenty one (32%) out 65 clinical ear swabs aeruginosa. According PCR amplification, 18 (85.7%) bacterial isolates expressed bot...

Phagocytosis of bacteria by macrophages and neutrophils is an essential component of host defense against infection. The mechanism whereby the interaction of opsonized particles with Fcgamma receptors triggers the engulfment of opsonized particles remains incompletely understood, although activation of tyrosine kinases has been recognized as an early step. Recent studies in other systems have d...

Mouse monoclonal antibodies raised by immunisation with a protective antigen extract from Pseudomonas aeruginosa serotype 1 varied in immunoglobulin isotype, in passive protective properties against infection by homologous P. aeruginosa serotype 1, and in cross-reactions in ELISA against antigen preparations from 15 other P. aeruginosa serotypes. All monoclonal antibodies with specificity in EL...

Bacterial persister cells constitute a small portion of a culture which is tolerant to killing by lethal doses of bactericidal antibiotics. These phenotypic variants are formed in numerous bacterial species, including those with clinical relevance like the opportunistic pathogen Pseudomonas aeruginosa. Although persisters are believed to contribute to difficulties in the treatment of many infec...

PepP is a virulence-associated gene in Pseudomonas aeruginosa, making it an attractive target for anti-P. aeruginosa drug development. The encoded protein, aminopeptidases P (Pa-PepP), is a type of X-prolyl peptidase that possesses diverse biological functions. The crystal structure verified its canonical pita-bread fold and functional tetrameric assembly, and the functional studies measured th...