To investigate the factors involved in the sorting of cargo proteins into COPII endoplasmic reticulum (ER) to Golgi apparatus transport vesicles, we have created a strain of S. cerevisiae (p24Delta8) that lacks all eight members of the p24 family of transmembrane proteins (Emp24p, Erv25p, and Erp1p to Erp6p). The p24 proteins have been implicated in COPI and COPII vesicle formation, cargo protein sorting, and regulation of vesicular transport in eukaryotic cells. We find that p24Delta8 cells grow identically to wild type and show delays of invertase and Gas1p ER-to-Golgi transport identical to those seen in a single Deltaemp24 deletion strain. Thus, p24 proteins do not have an essential function in the secretory pathway. Instead, they may serve as quality control factors to restrict the entry of proteins into COPII vesicles.
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http://dx.doi.org/10.1073/pnas.070044097 | DOI Listing |
Parasit Vectors
January 2025
College of Life Science and Technology, Xinjiang University, Urumqi, 830017, China.
Background: Tamdy virus (TAMV) was first isolated in Uzbekistan and Turkmenistan. In 2018, it was found in China, marking its entry into the molecular research era. TAMV is linked to febrile diseases, but its epidemiology and spillover risks are poorly understood, necessitating urgent molecular research and detection method development.
View Article and Find Full Text PDFVaccines (Basel)
January 2025
Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229, USA.
Background: Noroviruses, which cause epidemic acute gastroenteritis, and parasites, which lead to malaria, are two infectious pathogens that pose threats to public health. The protruding (P) domain of norovirus VP1 and the αTSR domain of the circumsporozoite protein (CSP) of sporozoite are the glycan receptor-binding domains of the two pathogens for host cell attachment, making them excellent targets for vaccine development. Modified norovirus P domains self-assemble into a 24-meric octahedral P nanoparticle (P NP).
View Article and Find Full Text PDFInt J Biol Macromol
January 2025
Key Laboratory of National Forestry and Grassland Administration on Biodiversity Conservation in Karst Mountainous Areas of Southwestern China, School of Life Sciences, Guizhou Normal University, Guiyang 550025, China. Electronic address:
ER stress activates the unfolded protein response (UPR), a critical mechanism for maintaining cellular homeostasis in plants. The p24 protein family is known to be involved in protein trafficking between the endoplasmic reticulum (ER) and the Golgi apparatus, but its role in ER stress remains unclear in plants. In this study, we found that Atp24δ8(delta8), a member of the δ-2 subclass of the p24 family, is significantly upregulated in response to tunicamycin-induced ER stress.
View Article and Find Full Text PDFProstaglandins Other Lipid Mediat
January 2025
Discipline of Pharmacology, Sydney Pharmacy School, Faculty of Medicine and Health, The University of Sydney, NSW 2050, Australia; Lambert Initiative for Cannabinoid Therapeutics, The University of Sydney, NSW 2050, Australia; Brain and Mind Centre, The University of Sydney, NSW 2050, Australia. Electronic address:
Objective: Dravet syndrome is a severe, intractable epilepsy in which 80 % of patients have a de novo mutation in the gene SCN1A. We recently reported that a high seizure burden increased hippocampal concentrations of an array of pro-inflammatory prostaglandins in the Scn1a mouse model of Dravet syndrome. This raised the possibility that a high seizure burden might also trigger the accumulation of specialized pro-resolving mediators that facilitate the resolution of neuroinflammation and brain repair.
View Article and Find Full Text PDFPNAS Nexus
December 2024
Department of Clinical Sciences Lund, Pediatrics, Lund University, 22184 Lund, Sweden.
Reduced serum level of insulin-like growth factor 1 (IGF-1), a major regulator of perinatal development, in extremely preterm infants has been shown to be associated with neurodevelopmental impairment. To clarify the mechanism of IGF-1 transport at the blood-cerebrospinal fluid (CSF) barrier of the immature brain, we combined studies of in vivo preterm piglet and rabbit models with an in vitro transwell cell culture model of neonatal primary murine choroid plexus epithelial (ChPE) cells. We identified IGF-1-positive intracellular vesicles in ChPE cells and provided data indicating a directional transport of IGF-1 from the basolateral to the apical media in extracellular vesicles (EVs).
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