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endocarditis/protease
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Modulation of glycosidase and protease activities by chemostat growth conditions in an endocarditis strain of Streptococcus sanguis.
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The effects of growth conditions on the properties of the endocarditis-producing oral bacterium Streptococcus sanguis FSS2 were studied. This strain produces a variety of proteases and glycosidases, including a thrombin-like activity that is a potential virulence factor for endocarditis. Cultures
Fsr-independent production of protease(s) may explain the lack of attenuation of an Enterococcus faecalis fsr mutant versus a gelE-sprE mutant in induction of endocarditis.
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An Enterococcus faecalis gelE insertion disruption mutant (TX5128), which produces neither gelatinase (GelE) nor the cotranscribed (in the wild type) serine protease (SprE), was found to be attenuated in a rat endocarditis model with a significant decrease in the endocarditis induction rate versus
Protease production by Streptococcus sanguis associated with subacute bacterial endocarditis.
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A viridans streptococcus (Streptococcus sanguis biotype II) isolated from the blood of a patient with subacute bacterial endocarditis was examined for protease production. In broth culture, extracellular proteolytic enzymes were not produced by this organism until after the early exponential phase
Role of vegetation-associated protease activity in valve destruction in human infective endocarditis.
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OBJECTIVE
Infective endocarditis (IE) is characterized by septic thrombi (vegetations) attached on heart valves, consisting of microbial colonization of the valvular endocardium, that may eventually lead to congestive heart failure or stroke subsequent to systemic embolism. We hypothesized that host
Predominant role of host proteases in myocardial damage associated with infectious endocarditis induced by Enterococcus faecalis in a rat model.
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Infective endocarditis (IE) remains a life-threatening infectious disease with high morbidity and mortality. The objectives of the present study are to assess the host proteolytic activities of the vegetations and their cytotoxic potential in a rat model of experimental IE. Rats were infected with a
Methicillin-sensitive Staphylococcus aureus bacteraemia and endocarditis among injection drug users and nonaddicts: host factors, microbiological and serological characteristics.
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BACKGROUND
Endocarditis has been associated with lower mortality and fewer complications among injection drug users (IDUs) than nonaddicts in Staphylococcus aureus bacteraemia (SAB). The better prognosis of IDUs has not been clarified but it has generally been explained by younger age and other host
[Coagulase-negative staphylococci isolated from cases of infective endocarditis].
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In this study we investigated the properties of 47 strains of coagulase-negative staphylococci (CNS) isolated from patients with infective endocarditis (IE) and 61 strains of CNS isolated from the skin flora of healthy people. Significant differences between the properties of CNS from IE and from
Non-typeable Haemophilus influenzae infective endocarditis in a renal transplant recipient: compromised host or virulent strain?
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Non-typeable Haemophilus influenzae (NTHI) rarely cause endocarditis. Of the limited reports of H influenzae endocarditis, most have been due to encapsulated organisms or have had limited bacterial characterisation. We encountered a transplant recipient with native valve NTHI endocarditis and were
Production of extracellular material by streptococci associated with subacute bacterial endocarditis.
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Six strains of viridans streptococci isolated from confirmed cases of subacute bacterial endocarditis were studied for production of extracellular material. All six strains, when grown to the exponential phase, produced exoproducts that had similar elution profiles on a G-100 Sephadex column. Since
Proteomics identifies a convergent innate response to infective endocarditis and extensive proteolysis in vegetation components
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Infective endocarditis is a life-threatening infection of heart valves and adjacent structures characterized by vegetations on valves and other endocardial surfaces, with tissue destruction and risk of embolization. We used high-resolution mass spectrometry to define the proteome of staphylococcal
Degradation of fibrinogen and collagen by staphopains, cysteine proteases released from Staphylococcus aureus.
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Staphylococcus aureus is the most frequently isolated pathogen in gram-positive sepsis often complicated by a blood clotting disorder, and is the leading cause of infective endocarditis induced by bacterial destruction of endocardial tissues. The bacterium secretes cysteine proteases referred to as
Neuraminidase production by a Streptococcus sanguis strain associated with subacute bacterial endocarditis.
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The properties of an extracellular neuraminidase produced by a Streptococcus sanguis strain (isolated from a confirmed case of subacute bacterial endocarditis) during growth in a defined medium was examined in this investigation. This enzyme, isolated from concentrated culture supernatants of S.
Streptococcal Siglec-like adhesins recognize different subsets of human plasma glycoproteins: implications for infective endocarditis.
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Streptococcus gordonii and Streptococcus sanguinis are typically found among the normal oral microbiota but can also cause infective endocarditis. These organisms express cell surface serine-rich repeat adhesins containing "Siglec-like" binding regions (SLBRs) that mediate attachment to α2-3-linked
Comparative analysis of the roles of HtrA-like surface proteases in two virulent Staphylococcus aureus strains.
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The HtrA surface protease is involved in the virulence of many pathogens, mainly by its role in stress resistance and bacterial survival. Staphylococcus aureus encodes two putative HtrA-like proteases, referred to as HtrA(1) and HtrA(2). To investigate the roles of HtrA proteins in S. aureus, we
An extracellular protease of Streptococcus gordonii hydrolyzes type IV collagen and collagen analogues.
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Streptococcus gordonii is a frequent cause of infective bacterial endocarditis, but its mechanisms of virulence are not well defined. In this study, streptococcal proteases were recovered from spent chemically defined medium (CDM) and fractionated by ammonium sulfate precipitation and by
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