Proteinase PrtP (EC:3.4.21.96) is a cell envelope proteinase (CEP) highly expressed in the probiotic strain Lactobacillus paracasei BL312(VSL#3) that accounts for its anti-inflammatory properties. The main aim of this work is to understand differences in CEP expression between this strain and L. paracasei BL23. Hence, differences in the regulation by amino acid sources of four proteinase related genes (prtP, prsA, prtR1 and prtR2) were determined by RT-qPCR in BL312(VSL#3) and BL23 using as a reference BL368, a BL23 derepressed mutant lacking the response regulator (RR) PrcR. BL312(VSL#3) showed greater expression of prtP (2- to 3-fold) than BL23, and prtP was highly repressed by peptone in both strains. Two other putative CEP genes, prtR1 and prtR2, showed a low expression profile. Interestingly, when the prsA-prtP promoter region from both strains, and deleted mutants, were cloned in vector pT1GR, expression of the gfp and mrfp fluorescent reporters was always repressed in BL23 (high or low peptone) and derepressed in BL368, revealing an interesting mechanism of regulation affecting specifically to this promoter. In conclusion, BL312(VSL#3) has higher expression of prtP and other CEP related genes than BL23, that could respond to a natural deregulation in this strain, possibly independent from the RR PrcR.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1093/femsle/fnaa102 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Pancreatic stellate cell: Update on molecular investigations and clinical translation in pancreatic cancer.
Int J Cancer
January 2025
Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Early Drug Development Center, Peking University Cancer Hospital and Institute, Beijing, China.
Pancreatic cancer is a particularly aggressive tumor, distinguished by the presence of a prominent collagenous stroma and desmoplasia that envelops the tumor cells. Pancreatic stellate cell (PSC) contributes to the formation of a dense fibrotic stroma and has been demonstrated to facilitate tumor progression. As the significance of PSCs is increasingly revealed, more explorations are focused on the complex molecular mechanisms and tumor-stromal crosstalk in order to guide potential therapeutic approaches through deactivating or reprogramming PSCs.
View Article and Find Full Text PDFReciprocal and non-reciprocal effects of clinically relevant SETBP1 protein dosage changes.
Hum Mol Genet
January 2025
Department of Human Genetics, McGill University, 3666 McTavish Street, Montreal, QC H3A 1Y2, Canada.
Many genes in the human genome encode proteins that are dosage sensitive, meaning they require protein levels within a narrow range to properly execute function. To investigate if clinically relevant variation in protein levels impacts the same downstream pathways in human disease, we generated cell models of two SETBP1 syndromes: Schinzel-Giedion Syndrome (SGS) and SETBP1 haploinsufficiency disease (SHD), where SGS is caused by too much protein, and SHD is caused by not enough SETBP1. Using patient and sex-matched healthy first-degree relatives from both SGS and SHD SETBP1 cases, we assessed how SETBP1 protein dosage affects downstream pathways in human forebrain progenitor cells.
View Article and Find Full Text PDFDengue Virus Fusion Peptide Promotes Hemifusion Formation by Disordering the Interfacial Region of the Membrane.
J Membr Biol
January 2025
School of Chemistry, Sambalpur University, Jyoti Vihar, Burla, Odisha, 768 109, India.
Membrane fusion is the first step in the infection process of the enveloped viruses. Enveloped viruses fuse either at the cell surface or enter the cell through endocytosis and transfer their internal genetic materials by fusing with the endosomal membrane at acidic pH. In this work, we have evaluated the effect of the Dengue virus fusion peptide (DENV FP) on the polyethylene glycol (PEG)-mediated lipid mixing of vesicles (hemifusion formation) at pH 5 and pH 7.
View Article and Find Full Text PDFGlycoprotein 350-targeted chimeric antigen receptor T-cell therapy for nonneoplastic chronic active Epstein-Barr virus infection: a case report.
Transl Pediatr
December 2024
Department of Infectious Diseases, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
Background: Chronic active Epstein-Barr virus (CAEBV) infection is a rare disease in which the Epstein-Barr virus (EBV) persists and replicates, causing chronic symptoms and fatal complications. The treatment of CAEBV is still evolving. Our case report showed a new therapy for CAEBV.
View Article and Find Full Text PDFS-layers: from a serendipitous discovery to a toolkit for nanobiotechnology.
Q Rev Biophys
January 2025
Institute of Synthetic Bioarchitectures, Department of Bionanosciences, University of Natural Resources and Life Sciences, Vienna, Austria.
Prokaryotic microorganisms, comprising and , exhibit a fascinating diversity of cell envelope structures reflecting their adaptations that contribute to their resilience and survival in diverse environments. Among these adaptations, surface layers (S-layers) composed of monomolecular protein or glycoprotein lattices are one of the most observed envelope components. They are the most abundant cellular proteins and represent the simplest biological membranes that have developed during evolution.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!