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Chromogranin A (CgA) is a key luminal actor of secretory granule biogenesis at the trans‐Golgi network (TGN) level but the molecular mechanisms involved remain obscure. Here, we investigated the possibility that CgA acts synergistically with specific membrane lipids to trigger secretory granule formation. We show that CgA preferentially interacts with the anionic glycerophospholipid phosphatidic acid … Lire la suite

Although originally restricted to their structural role as major constituents of membranes, lipids are now well-defined actors to integrate intracellular or extracellular signals. Accordingly, it has been known for decades that lipids, especially those coming from diet, are important to maintain normal physiological functions and good health. This is especially the case to maintain proper … Lire la suite

Cell polarity is achieved by regulators such as small G proteins, exocyst members and phosphoinositides, with the latter playing a key role when bound to the exocyst proteins Sec3p and Exo70p, and Rho GTPases. This ensures asymmetric growth via the routing of proteins and lipids to the cell surface using actin cables. Previously, using a … Lire la suite

Cells maintain a constant dialog between the extracellular matrix and their plasma membrane to fine tune signal transduction processes. We found that the receptor kinase FERONIA (FER), which is a proposed cell wall sensor, modulates phosphatidylserine plasma membrane accumulation and nano-organization, a key regulator of Rho GTPase signaling in Arabidopsis. We demonstrate that FER is … Lire la suite

Increasing evidence supports a relationship between lipid metabolism and mental health. In particular, the biostatus of polyunsaturated fatty acids (PUFAs) correlates with some symptoms of psychiatric disorders, as well as the efficacy of pharmacological treatments. Recent findings highlight a direct association between brain PUFA levels and dopamine transmission, a major neuromodulatory system implicated in the … Lire la suite

Introduction Absolute quantification of individual metabolites in complex biological samples is crucial in targeted metabolomic profiling. Objectives An inter-laboratory test was performed to evaluate the impact of the NMR software, peak-area determination method (integration vs. deconvolution) and operator on quantification trueness and precision. Methods A synthetic urine containing 32 compounds was prepared. One site prepared … Lire la suite

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To decipher the biochemical bases of nitrogen (N) utilization and metabolism of silage maize in relation to growth and productivity, an untargeted metabolomic (proton NMR- and LC-QTOF-MS based) and proteomic approach was conducted on leaves of 29 hybrids cultivated in the field under optimal and reduced N fertilization. The corresponding biochemical data were analyzed either … Lire la suite

Very-long-chain fatty acids (i.e., fatty acids with more than 18 carbon atoms; VLCFA) are important molecules that play crucial physiological and structural roles in plants. VLCFA are specifically present in several membrane lipids and essential for membrane homeostasis. Their specific accumulation in the sphingolipids of the plasma membrane outer leaflet is of primordial importance for … Lire la suite