Identification and characterization of OmpT ‐like proteases in uropathogenic Escherichia coli clinical isolates

Here, we investigated omptin protease ‐mediated antimicrobial resistance among uropathogenicEscherichia coli clinical isolates. We found that clinical isolates with the highest omptin protease activity encode multiple omptin proteases, showing different substrate specificities. Our data suggest that the presence of multiple omptin family proteases in a single clinical isolate may provide a fitness advantage by expanding the range of natural antimicrobial peptides cleaved during urogenital tract colonization. AbstractBacterial colonization of the urogenital tract is limited by innate defenses, including the production of antimicrobial peptides (AMPs). UropathogenicEscherichia coli (UPEC) resist AMP ‐killing to cause a range of urinary tract infections (UTIs) including asymptomatic bacteriuria, cystitis, pyelonephritis, and sepsis. UPEC strains have high genomic diversity and encode numerous virulence factors that differentiate them from non‐UTI‐causing strains, includingompT. As OmpT homologs cleave and inactivate AMPs, we hypothesized that UPEC strains from patients with symptomatic UTIs have high OmpT protease activity. Therefore, we measured OmpT activity in 58 clinicalE.  coli isolates. While heterogeneous OmpT activities were observed, OmpT activity was significantly greater in UPEC strains isolated from patients with symptomatic infections. Unexpectedly, UPEC strains exhibiting the greatest protease activities harbored an additionalompT‐like gene calledarl...
Source: MicrobiologyOpen - Category: Microbiology Authors: Tags: SPECIAL ISSUE: ANTIMICROBIAL RESISTANCE Source Type: research

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CONCLUSION: Prevalence of antibiotic use was high not only versus other hospitals in the region but globally including Africa, coupled with significant evidence of sub-optimal prescribing. Swift action is needed to improve future prescribing to reduce AMR. One or two areas should initially be targeted for quality improvement including development of local guidelines, documentation of antibiotic indications and/or stop/review dates. PMID: 33034234 [PubMed - as supplied by publisher]
Source: Expert Review of Anti-Infective Therapy - Category: Infectious Diseases Tags: Expert Rev Anti Infect Ther Source Type: research
CONCLUSIONS: Xyloglucan/gelose plus ORS was effective and safe in treating acute diarrhea in children. PMID: 33028102 [PubMed - as supplied by publisher]
Source: Expert Review of Gastroenterology and Hepatology - Category: Gastroenterology Tags: Expert Rev Gastroenterol Hepatol Source Type: research
Conclusions: (1) Data at our center suggests at least a regional implementation gap in GBS screening and IAP. (2) The decline in the resistance rate ofE. coli for all antimicrobial substances might indicate that the reduction of prenatal antibiotics use is beneficial and that neonatal antibiotic stewardship programs should include pregnant women as well.What is Known:• GBS screening and intrapartum antibiotic prophylaxis led to a 32%-reduction in GBS disease in Germany with a 0.75 (92:122) ratio of early-onset disease to late-onset disease in 2009–2010.• Prenatal antibiotic use might increase the risk of E....
Source: European Journal of Pediatrics - Category: Pediatrics Source Type: research
This study investigated antibacterial-producing Streptomyces isolated from the gut of estuarine fish Chanos chanos, emphasizing screening for the producer of peptide-containing antibacterial compounds. Eighteen isolates were found during preliminary screening, in which four isolates showed the best antibacterial activities. Based on the morphological, physiological, and biochemical characterization, as well as 16S rRNA partial sequencing, all of the four isolates belonged to Streptomyces. Three isolates were suspected as novel isolate candidates based on homology presentations and phylogenetic tree analysis. Disk-diffusion...
Source: International Journal of Microbiology - Category: Microbiology Tags: Int J Microbiol Source Type: research
Publication date: Available online 9 October 2020Source: Journal of Global Antimicrobial ResistanceAuthor(s): Elma L. Leite, Wydemberg J. Araújo, Tatiana R. Vieira, Karoline S. Zenato, Priscylla C. Vasconcelos, Samuel Cibulski, Patricia E.N. Givisiez, Marisa R.I. Cardoso, Celso J.B. Oliveira
Source: Journal of Global Antimicrobial Resistance - Category: Infectious Diseases Source Type: research
Publication date: Available online 8 October 2020Source: Journal of Global Antimicrobial ResistanceAuthor(s): E.L. Looman, P. van Tienen, D.Y.K. Ng, S. Baig, A. Fait, S. Overballe-Petersen, P.S. Andersen, M. Stegger
Source: Journal of Global Antimicrobial Resistance - Category: Infectious Diseases Source Type: research
Publication date: Available online 8 October 2020Source: LWTAuthor(s): Lanlin Yu, Su Zhang, Yuanyuan Xu, Xiaoyu Mi, Tong Xing, Jiaolong Li, Lin Zhang, Feng Gao, Yun Jiang
Source: LWT Food Science and Technology - Category: Food Science Source Type: research
Publication date: Available online 9 October 2020Source: Food ControlAuthor(s): John Jorgensen, Rebecca Bland, Joy Waite-Cusic, Jovana Kovacevic
Source: Food Control - Category: Food Science Source Type: research
The objective of this work was to carry out a bibliographic survey of secondary metabolites isolated from the Velloziaceae family, creating a bank of compounds. After the bank was created, four prediction models for potentially active compounds against pathogenic microorganisms (Candida albicans, Escherichia coli, Pseudomonas aeruginosa and Salmonella sp.) were obtained trying to identify which metabolites would be more active against the strains. Four sets of compounds with known activity for microorganisms were selected for the construction of predictive models from the CHEMBL database. Another bank with 163 unique molec...
Source: Journal of the Brazilian Chemical Society - Category: Chemistry Source Type: research
tto A Abstract We characterized antibiotic resistance and virulence of uropathogenic E. coli (UPEC) strains isolated from urinary tract infection (UTI) in patients hospitalized in urology Departments. A prospective multicenter study was initiated from March 2009 and lasted through February 2010 in French urology units. All patients with asymptomatic bacteriuria (ABU), acute cystitis, acute pyelonephritis or acute prostatitis in whom UPEC was detected, were included. Antimicrobial resistance and virulence factors were compared between the different groups. To identify independent associations between virulence mark...
Source: Journal of Medical Microbiology - Category: Microbiology Authors: Tags: J Med Microbiol Source Type: research
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