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Molecular basis of vitamin K driven γ-carboxylation at membrane interface.
Nature
January 2025
Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, MO, USA.
The γ-carboxylation of glutamate residues enables Ca-mediated membrane assembly of protein complexes that support broad physiological functions including hemostasis, calcium homeostasis, immune response, and endocrine regulation. Modulating γ-carboxylation level provides prevalent treatments for hemorrhagic and thromboembolic diseases. This unique posttranslational modification requires vitamin K hydroquinone (KH) to drive highly demanding reactions catalyzed by the membrane-integrated γ-carboxylase (VKGC).
View Article and Find Full Text PDFThe atypical proteome of mitochondria from mature pollen grains.
Curr Biol
January 2025
Department of Plant Physiology, UPSC, Umeå University, 90187 Umeå, Sweden. Electronic address:
To propagate their genetic material, flowering plants rely on the production of large amounts of pollen grains that are capable of germinating on a compatible stigma. Pollen germination and pollen tube growth are thought to be extremely energy-demanding processes. This raises the question of whether mitochondria from pollen grains are specifically tuned to support this developmental process.
View Article and Find Full Text PDFThe regulatory mechanisms for beef tenderization by the calcium-independent phospholipase A activity of Peroxiredoxin 6.
Food Chem
January 2025
Lab of Meat Processing and Quality Control, College of Food Science and Engineering, Shandong Agricultural University, Tai'an, Shandong 271018, PR China. Electronic address:
This study investigated the effect of the inhibition of the activity of Ca-independent Phospholipase A (iPLA) of Peroxiredoxin 6 (Prdx6) on beef tenderization in the early post-mortem period. Longissimus lumborum (LL) were incubated with or without the inhibitor of iPLA activity of Prdx6 (MJ33) for 1, 6, 12, 24, or 36 h, followed by incubation with or without the HO. iPLA activity, troponin T and desmin, Ca concentration, calpain-1, caspases, apoptosis rate, and cell morphology were examined.
View Article and Find Full Text PDFThe calcitron: A simple neuron model that implements many learning rules via the calcium control hypothesis.
PLoS Comput Biol
January 2025
Edmond and Lily Safra Center for Brain Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel.
Theoretical neuroscientists and machine learning researchers have proposed a variety of learning rules to enable artificial neural networks to effectively perform both supervised and unsupervised learning tasks. It is not always clear, however, how these theoretically-derived rules relate to biological mechanisms of plasticity in the brain, or how these different rules might be mechanistically implemented in different contexts and brain regions. This study shows that the calcium control hypothesis, which relates synaptic plasticity in the brain to the calcium concentration ([Ca2+]) in dendritic spines, can produce a diverse array of learning rules.
View Article and Find Full Text PDFNADPH oxidase derived ROS promote arterial contraction in early postnatal rats by activation of L-type voltage-gated Ca channels.
Free Radic Res
January 2025
Department of Human and Animal Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia.
Reactive oxygen species (ROS) produced by NADPH oxidase promote contraction of peripheral arteries, which is especially pronounced in early postnatal period in comparison to adulthood, but the mechanisms of such vasomotor influence are poorly understood. We tested the hypothesis that Rho-kinase and protein kinase C (PKC) mediate procontractile influence of NADPH oxidase derived ROS in peripheral artery of early postnatal rats. In addition, we evaluated the involvement Src-kinase and L-type voltage-gated Ca channels (LTCC) into procontractile influence of ROS, produced by NADPH oxidase, because of their known interplay with Rho-kinase and PKC pathways.
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