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Tyramine-enzyme conjugate repeats for an interdigitated capacitance immunosensing array in the detection of neuroblastoma biomarker neuron-specific enolase.
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January 2025
Department of Pediatric Surgery, The First Affiliated Hospital of Fujian Medical University, 20 Cha-Zhong Road, Taijiang District, Fuzhou 350005, China.
Methods based on enzyme labelling strategies have been widely developed for capacitance immunoassays, but most suffer from low sensitivity and are unfavorable for routine use in the early stages of diagnostics. Herein, we designed a highly efficient capacitance immunosensing method for the low-abundance neuroblastoma biomarker neuron-specific enolase (NSE) using an interdigitated micro-comb electrode. Initially, monoclonal mouse anti-human NSE capture antibodies were immobilized on the interdigitated gold electrodes using bovine serum albumin.
View Article and Find Full Text PDFDetermination of Trends Underlying Aspartic Acid Isomerization in Intact Proteins Reveals Unusually Rapid Isomerization of Tau.
ACS Chem Neurosci
January 2025
Department of Chemistry, University of California, Riverside, California 92521, United States.
Spontaneous chemical modifications in long-lived proteins can potentially change protein structure in ways that impact proteostasis and cellular health. For example, isomerization of aspartic acid interferes with protein turnover and is anticorrelated with cognitive acuity in Alzheimer's disease. However, few isomerization rates have been determined for Asp residues in intact proteins.
View Article and Find Full Text PDFVariable peptide processing of a Conus (Asprella) neocostatus α-conotoxin generates bioactive toxiforms that are potent against distinct nicotinic acetylcholine receptor subtypes.
Biochem Pharmacol
January 2025
The Marine Science Institute, University of the Philippines Diliman, Quezon City 1101, Philippines. Electronic address:
Conusvenoms are composed of peptides that are commonly post-translationally modified, increasing their chemical diversity beyond what is encoded in the genome and enhancing their potency and selectivity. This study describes how PTMs alter an α-conotoxin's selectivity for specific nAChR subtypes. Venom from the cone snailConus(Asprella)neocostatuswas fractionated using high-performance liquid chromatography and tested using a behavioral intracranial mouse bioassay and a cholinergic calcium imaging assay using SH-SY5Y neuroblastoma cells.
View Article and Find Full Text PDFAdaptive protein synthesis in genetic models of copper deficiency and childhood neurodegeneration.
Mol Biol Cell
January 2025
Department of Cell Biology, Emory University, 615 Michael St, Atlanta, GA, USA, 30322.
Rare inherited diseases caused by mutations in the copper transporters (CTR1) or induce copper deficiency in the brain, causing seizures and neurodegeneration in infancy through poorly understood mechanisms. Here, we used multiple model systems to characterize the molecular mechanisms by which neuronal cells respond to copper deficiency. Targeted deletion of CTR1 in neuroblastoma cells produced copper deficiency that produced a metabolic shift favoring glycolysis over oxidative phosphorylation.
View Article and Find Full Text PDFCharacterization of multiple binding sites on microtubule associated protein 2c recognized by dimeric and monomeric 14-3-3ζ.
FEBS J
January 2025
Central European Institute of Technology, Masaryk University, Brno, Czech Republic.
Microtubule associated protein 2 (MAP2) interacts with the regulatory protein 14-3-3ζ in a cAMP-dependent protein kinase (PKA) phosphorylation dependent manner. Using selective phosphorylation, calorimetry, nuclear magnetic resonance, chemical crosslinking, and X-ray crystallography, we characterized interactions of 14-3-3ζ with various binding regions of MAP2c. Although PKA phosphorylation increases the affinity of MAP2c for 14-3-3ζ in the proline rich region and C-terminal domain, unphosphorylated MAP2c also binds the dimeric 14-3-3ζ via its microtubule binding domain and variable central domain.
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