نتایج جستجو برای: fimh hlya
تعداد نتایج: 764 فیلتر نتایج به سال:
α-Hemolysin (HlyA) from Escherichia coli is considered as the prototype of a family of toxins called RTX (repeat in toxin), a group of proteins that share genetic and structural features. HlyA is an important virulence factor in E. coli extraintestinal infections, such as meningitis, septicemia and urinary infections. High concentrations of the toxin cause the lysis of several cells such as ery...
Functionalities which may be genetically programmed into a bacterium are limited by its range of possible activities and its sensory capabilities. Therefore, enhancing the bacterial sensory repertoire is a crucial step for expanded utility in potential biomedical, industrial or environmental applications. Using microarray and qRT-PCR analyses, we have investigated transcription in E. coli (stra...
Mechanical and conformational properties of type 1 fimbriae were evaluated on live bacterial cells by Single Molecule Force Spectroscopy (SMFS) and Dynamic Force Spectroscopy (DFS) in buffered solutions whose pH varied from 3 to 9. We evidenced that both fimbrial extension and fimbrial binding force to mannosylated-surface are modulated with changing the externally applied shear force and the s...
α-haemolysin (HlyA)-producing Escherichia coli commonly inflict severe urinary tract infections, including pyelonephritis, which comprises substantial risk for sepsis. In vitro, the cytolytic effect of HlyA is mainly mediated by ATP release through the HlyA pore and subsequent P2X1/P2X7 receptor activation. This amplification of the lytic process is not unique to HlyA but is observed by many ot...
Background: Listeria monocytogenes is the causative agent of listeriosis, a highly fatal opportunistic food borne infection. Listeriolysin O is a major virulence factor in this bacterium, which is encoded by hlyA. The aim of the present study was to determine the relation of Listeria monocytogenes hlyA gene isolated from fresh cheese with habitual abortion in Marvdasht. Materials and methods: I...
We have investigated the molecular basis of spontaneous mutations leading to non-hemolytic and avirulent variants of the Listeria monocytogenes serotype 1/2a strain NCTC 7973 using Southern hybridization to DNA fragments that harbor the listeriolysin gene (hlyA) and adjacent regions cloned from a L. monocytogenes serotype 1/2a strain. The analysis of such non-hemolytic variants revealed the pre...
Gram-negative uropathogenic Escherichia coli (UPEC) bacteria are a causative pathogen of urinary tract infections (UTIs). Previously developed antivirulence inhibitors of the type 1 pilus adhesin, FimH, demonstrated oral activity in animal models of UTI but were found to have limited compound exposure due to the metabolic instability of the O-glycosidic bond (O-mannosides). Herein, we disclose ...
زمینه و هدف: عفونت مجرای ادراری یکی از متداولترین عفونتها در کلیه گروههای سنی است. اغلب این عفونتها توسط سویههای اوروپاتوژنیک اشریشیاکلی ایجاد میگردند. اتصال به سطح بافت پوششی مجرای ادراری، کلونیزاسیون و توانایی سویههای upec در ایجاد عفونتهای ادراری علامتدار به واسطه عوامل اتصالی نظیر فیمبریههای تیپ یک (fimh) انجام میشود. هدف این مطالعه تعیین فراوانی ژن کد کننده فیمبریه نوع یک (fimh...
Inhibiting antibodies targeting receptor-binding pockets in proteins is a major focus in the development of vaccines and in antibody-based therapeutic strategies. Here, by using a common mannose-specific fimbrial adhesin of Escherichia coli, FimH, we demonstrate that locking the adhesin in a low-binding conformation induces the production of binding pocket-specific, adhesion-inhibiting antibodi...
زمینه و اهداف: در حال حاضر روش استاندارد برای تشخیص لیستریا مونوسیتوژنز کشت می باشد. به علت این که در خوراک دام از آنتی بیوتیک استفاده می شود و این باکتری داخل سلولی می باشد حساسیت کشت به شدت کاهش می یابد. به علاوه، تشخیص با این روش بیشتر از 36 ساعت طول می کشد. لذا، دست یابی به آزمونی که بتواند در هر شرایطی وجود لیستریا مونوسیتوژنز را در نمونه بالینی نشان دهد، ارزشمند می باشد. هدف این مطالعه تش...
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