Elastase, a potential virulence factor from the opportunistic pathogen Aspergillus fumigatus, was purified 220-fold from culture broth by fast-performance liquid chromatography employing anion exchange (Q Sepharose fast flow), cation exchange (S Sepharose fast flow), and gel filtration (Superose 12). Purified to near homogeneity, the elastase had an apparent molecular mass of 32 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (silver stain) but a mass of about 19.1 kDa as determined by gel filtration on Superdex 75. The elastase is not glycosylated and is positively charged at neutral pH, having a pI of 8.75. Inhibition by 0.2 mM phenylmethylsulfonyl fluoride (100%) and 0.21 mM leupeptin (60%) implies that the elastase is a serine protease. However, the enzyme is also inhibited by 5 mM EDTA (100%) and 10 mM 1,10-orthophenanthroline (30%), suggesting a requirement for divalent cations. The enzyme acts optimally at pH 7.4 and 45 degrees C in 50 mM sodium borate buffer, but in Tris HCl, the pH optimum shifts to 8.8.
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http://dx.doi.org/10.1128/iai.60.3.728-734.1992 | DOI Listing |
Infect Drug Resist
January 2025
Department of Pulmonary and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, 610041, People's Republic of China.
We present a rare case of asymptomatic allergic bronchopulmonary aspergillosis (ABPA) concurrent with active pulmonary tuberculosis. Allergic bronchopulmonary aspergillosis is an immunological pulmonary disorder characterized by hypersensitivity to Aspergillus fumigatus, while pulmonary tuberculosis (PTB) is a complex infection caused by Mycobacterium tuberculosis (MTB). The association between pulmonary tuberculosis infections and Aspergillus infections remains a fascinating area of inquiry.
View Article and Find Full Text PDFFront Med (Lausanne)
January 2025
Department of Hepatobiliary Surgery, The First Affiliated Hospital of Jinan University, Guangzhou, China.
spondylitis is a rare fungal infection, primarily occurring in immunocompromised patients, although cases in immunocompetent individuals have also been reported. While is commonly associated with pulmonary infections, it can also cause spondylitis. Patients typically present with back pain, limb numbness, and neurological compression symptoms.
View Article and Find Full Text PDFClin Respir J
January 2025
Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China.
Objective: This study was conducted to further understand the clinical characteristics of COVID-19 associated pulmonary aspergillosis (CAPA).
Methods: In this study, we conducted a multicenter retrospective survey, which included patients with COVID-19 from five hospitals in Zhejiang, China. A total of 197 patients with COVID-19 were included in the study.
Antibiotics (Basel)
January 2025
Laboratory for Taxonomic Study and Collection of Cultures of Microorganisms, Gause Institute of New Antibiotics, St. Bolshaya Pirogovskaya, 11, 119021 Moscow, Russia.
In this study, two compounds have been isolated from the Arctic-derived fungus INA 13460. Structural elucidation, performed using 2D NMR and HR-ESIMS data, has identified the compounds as stereoisomers of secalonic acids, dimeric tetrahydroxanthones. The absolute configurations of these stereoisomers have been determined through conformational NMR analysis and circular dichroism spectroscopy.
View Article and Find Full Text PDFAntibiotics (Basel)
January 2025
Center for Targeted Drug Delivery, Department of Biomedical and Pharmaceutical Sciences, Chapman University School of Pharmacy, Harry and Diane Rinker Health Science Campus, Irvine, CA 92618, USA.
We have previously reported peptides composed of sequential arginine (R) residues paired with tryptophan (W) or 3,3-diphenyl-L-alanine residues (Dip), such as cyclic peptides [RW] and [R(Dip)], as antibacterial agents. Herein, we report antibacterial and antifungal activities of five linear peptides, namely ((DipR)(WR)), ((DipR)(WR)), ((DipR)(WR)), ((DipR)(WR)), and (DipR)R, and five cyclic peptides [(DipR)(WR)], [(DipR)(WR)], [(DipR)(WR)], [(DipR)(WR)], and [DipR], containing alternate positively charged R and hydrophobic W and Dip residues against fungal, Gram-positive, and Gram-negative bacterial pathogens. The minimum inhibitory concentrations (MICs) of all peptides were determined by the micro-broth dilution method against , , , , , , , , and .
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