Infections of aortic prosthesis are quite unusual. When occurring, they represent a real challenge for both medical and surgical care, and their morbidity and mortality rates are high. Initially, these infections can be treated with antibiotics, but, in case of failure, the infected prosthesis must be removed and a new aorto-iliac system has to be reconstructed surgically. We report, the case of a woman affected by infection of an aortic prosthesis and whose problem has been solved by means of a new aorto-iliac graft by using cryogenically conserved allograft. Epidemiology, potential complications and treatment will be discussed.
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J Virol
January 2025
Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, California, USA.
Human astroviruses (HAstVs) are a leading cause of viral childhood diarrhea that infects nearly every individual during their lifetime. Although human astroviruses are highly prevalent, no approved vaccine currently exists. Antibody responses appear to play an important role in protection from HAstV infection; however, knowledge about the neutralizing epitope landscape is lacking, as only three neutralizing antibody epitopes have previously been determined.
View Article and Find Full Text PDFcauses more than 400,000 life-threatening, and half a billion mucosal infections annually. In response to infection, the host limits availability of essential micronutrients, including zinc, to restrict growth of the invading pathogen. As assimilation of zinc is essential for pathogenicity, its limitation induces the secretion of the zincophore protein Pra1 to scavenge zinc from the host.
View Article and Find Full Text PDFCRISPR-Cas12a is widely used for genome editing and biomarker detection since it can create targeted double-stranded DNA breaks and promote non-specific DNA cleavage after identifying specific DNA. To mitigate the off-target DNA cleavage of Cas12a, we previously developed a Cas12a variant (FnoCas12a ) by introducing double proline substitutions (K969P/D970P) in a conserved helix called the bridge helix (BH). In this work, we used cryogenic electron microscopy (cryoEM) to understand the molecular mechanisms of BH- mediated activation of Cas12a.
View Article and Find Full Text PDFStructure
January 2025
Małopolska Centre of Biotechnology, Jagiellonian University, Kraków, Poland. Electronic address:
Deoxyhypusination is the first rate-limiting step of the unique post-translational modification-hypusination-that is catalyzed by deoxyhypusine synthase (DHS) and deoxyhypusine hydroxylase (DOHH). This modification is essential for the activation of translation factor 5A in eukaryotes (eIF5A) and Archaea (aIF5A). This perspective focuses on the structural biology of deoxyhypusination complexes in eukaryotic and archaeal organisms.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
January 2025
Department of Biochemistry and Biophysics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104.
Class I major histocompatibility complex (MHC-I) proteins play a pivotal role in adaptive immunity by displaying epitopic peptides to CD8+ T cells. The chaperones tapasin and TAPBPR promote the selection of immunogenic antigens from a large pool of intracellular peptides. Interactions of chaperoned MHC-I molecules with incoming peptides are transient in nature, and as a result, the precise antigen proofreading mechanism remains elusive.
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