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Rajan Lamichhane et al.
Structure (London, England : 1993), 28(3), 371-377 (2020-01-25)
G-protein-coupled receptors (GPCRs) mediate a wide range of human physiological functions by transducing extracellular ligand binding events into intracellular responses. GPCRs can activate parallel, independent signaling pathways mediated by G proteins or β-arrestins. Whereas "balanced" agonists activate both pathways equally
Victoria M Latza et al.
Biophysical journal, 118(7), 1602-1611 (2020-02-26)
Membrane-bound oligosaccharides with specific chemistries are known to promote tight adhesion between adjacent membranes via the formation of weak saccharide bonds. However, in the literature, one can find scattered evidence that other, more abundant saccharide chemistries exhibit similar behavior. Here
Jonathan F Tait et al.
Analytical biochemistry, 329(1), 112-119 (2004-05-12)
We developed a method for measuring the binding affinity of annexin V for phospholipid vesicles and cells at very low levels of membrane occupancy. The annexin V-117 mutant was labeled with fluorescein iodoacetamide on its single N-terminal cysteine residue; binding
Sumie Manno et al.
The Journal of biological chemistry, 285(44), 33923-33929 (2010-08-21)
Human erythrocytes are continuously exposed to glucose, which reacts with the amino terminus of the β-chain of hemoglobin (Hb) to form glycated Hb, HbA1c, levels of which increase with the age of the circulating cell. In contrast to extensive insights
Arnaud Marquette et al.
Biochimica et biophysica acta. Biomembranes, 1862(2), 183149-183149 (2019-12-10)
Viral protein R (Vpr) is a small accessory protein of 96 amino acids that is present in Human and simian immunodeficiency viruses. Among the very different properties that Vpr possesses we can find cell penetrating capabilities. Based on this and
Stéphanie Jephthah et al.
Biomolecules, 10(4) (2020-04-23)
Magnesium transporter A (MgtA) is an active transporter responsible for importing magnesium ions into the cytoplasm of prokaryotic cells. This study focuses on the peptide corresponding to the intrinsically disordered N-terminal region of MgtA, referred to as KEIF. Primary-structure and
Saba Ghazvini et al.
Langmuir : the ACS journal of surfaces and colloids, 34(3), 1159-1170 (2017-10-12)
Lipid membranes, a major component of cells, are subjected to significant changes in pH depending on their location in the cell: the outer leaflet of the cell membrane is exposed to a pH of 7.4 whereas lipid membranes that make
Kari Kusler et al.
The journal of physical chemistry. B, 120(50), 12883-12889 (2016-12-14)
Phosphatidylserine (PS) has previously been found to bind Cu2+ in a ratio of 1 Cu2+ ion per 2 PS lipids to form a complex with an apparent dissociation constant that can be as low as picomolar. While the affinity of
Jigesh Patel et al.
Biochimica et biophysica acta. Biomembranes, 1862(2), 183140-183140 (2019-12-04)
There is an on-going debate whether anesthetic drugs, such as isoflurane, can cause meaningful structural changes in cell membranes at clinical concentrations. In this study, the effects of isoflurane on lipid membrane fluidity were investigated using fluorescence anisotropy and spectroscopy.
Erick Miranda-Laferte et al.
The Journal of biological chemistry, 289(15), 10387-10398 (2014-02-13)
The β-subunit associates with the α1 pore-forming subunit of high voltage-activated calcium channels and modulates several aspects of ion conduction. Four β-subunits are encoded by four different genes with multiple splice variants. Only two members of this family, β2a and
Stefania Zimbone et al.
International journal of molecular sciences, 21(8) (2020-04-25)
Copper plays an important role as a regulator in many pathologies involving the angiogenesis process. In cancerogenesis, tumor progression, and angiogenic diseases, copper homeostasis is altered. Although many details in the pathways involved are still unknown, some copper-specific ligands have
Anna Lívia Linard Matos et al.
Cells, 9(5) (2020-05-14)
Annexin A2 (AnxA2) is a cytosolic Ca2+ regulated membrane binding protein that can induce lipid domain formation and plays a role in exocytosis and endocytosis. To better understand the mode of annexin-membrane interaction, we analyzed membrane-bound AnxA2 assemblies by employing
Li-Ping Gao et al.
Biochimica et biophysica acta. General subjects, 1864(1), 129422-129422 (2019-09-07)
Previous studies suggested that fibrillar human IAPP (hIAPP) is more likely to deposit in β-cells, resulting in β-cell injury. However, the changes in the conformation of hIAPP in lipid environment and the mechanism involved in β-cell damage are unclear. Synthetic
Renato M S Cardoso et al.
Biochimica et biophysica acta. Biomembranes, 1862(3), 183157-183157 (2019-12-18)
Association of amphiphiles with biomembranes is important for their availability at specific locations in organisms and cells, being critical for their biological function. A prominent role is usually attributed to the hydrophobic effect, and to electrostatic interactions between charged amphiphiles
Julia Skalska et al.
Nanoscale, 11(48), 23366-23381 (2019-12-04)
One of the most important causes of failure in tumour treatment is the development of resistance to therapy. Cancer cells can develop the ability to lose sensitivity to anti-neoplastic drugs during reciprocal crosstalk between cells and their interaction with the
Sophia C Goodchild et al.
PloS one, 9(8), e104492-e104492 (2014-08-08)
Although the molecular mechanisms underlying the pathology of amyloidoses are not well understood, the interaction between amyloid proteins and cell membranes is thought to play a role in several amyloid diseases. Amyloid fibrils of β2-microglobulin (β2m), associated with dialysis-related amyloidosis
Alessandra Luchini et al.
Analytical chemistry, 92(1), 1081-1088 (2019-11-27)
In vitro characterization of membrane proteins requires experimental approaches providing mimics of the microenvironment that proteins encounter in native membranes. In this context, supported lipid bilayers provide a suitable platform to investigate membrane proteins by a broad range of surface-sensitive
Morane Lointier et al.
Biochimica et biophysica acta. Biomembranes, 1862(8), 183212-183212 (2020-02-15)
The LAH4 family of amphipathic peptides exhibits pronounced antimicrobial, cell penetrating and nucleic acid transfection activities. Furthermore, variants were designed with potent lentiviral transduction enhancement. When viewed along a helical wheel the four histidines are arranged to form an amphipathic
James W P Brown et al.
Nature communications, 10(1), 5662-5662 (2019-12-13)
Single-molecule assays have, by definition, the ultimate sensitivity and represent the next frontier in biological analysis and diagnostics. However, many of these powerful technologies require dedicated laboratories and trained personnel and have therefore remained research tools for specialists. Here, we
Hongbing Yao et al.
The Journal of biological chemistry, 283(2), 849-854 (2007-11-16)
Hepatocytes play a crucial role in regulating lipid metabolism by exporting cholesterol and triglyceride into plasma through secretion of very low density lipoproteins (VLDL). VLDL production is also required for release of hepatitis C virus (HCV) from infected hepatocytes. Here
Peter A Leventis et al.
Annual review of biophysics, 39, 407-427 (2010-03-03)
Phosphatidylserine (PS) is the most abundant negatively charged phospholipid in eukaryotic membranes. PS directs the binding of proteins that bear C2 or gamma-carboxyglutamic domains and contributes to the electrostatic association of polycationic ligands with cellular membranes. Rather than being evenly
Irene S Tobias et al.
The Biochemical journal, 473(4), 509-523 (2015-12-05)
Atypical protein kinase C (aPKC) isoenzymes are key modulators of insulin signalling, and their dysfunction correlates with insulin-resistant states in both mice and humans. Despite the engaged interest in the importance of aPKCs to type 2 diabetes, much less is
R J Perrin et al.
The Journal of biological chemistry, 275(44), 34393-34398 (2000-08-23)
alpha-Synuclein has been centrally implicated in neurodegenerative disease, and a normal function in developmental synaptic plasticity has been suggested by studies in songbirds. A variety of observations suggest the protein partitions between membrane and cytosol, a behavior apparently conferred by
John M Harrington et al.
The Journal of biological chemistry, 289(36), 24811-24820 (2014-07-20)
Haptoglobin-related protein (Hpr) is a component of a minor subspecies of high density lipoproteins (HDL) that function in innate immunity. Here we show that assembly of Hpr into HDL is mediated by its retained N-terminal signal peptide, an unusual feature
Ruijun Zhang et al.
Science translational medicine, 8(336), 336ra62-336ra62 (2016-04-29)
Development of an HIV vaccine is a global priority. A major roadblock to a vaccine is an inability to induce protective broadly neutralizing antibodies (bnAbs). HIV gp41 bnAbs have characteristics that predispose them to be controlled by tolerance. We used
Yousef Nademi et al.
Nanoscale, 12(2), 1032-1045 (2019-12-18)
Cell entry of polymeric nanoparticles (NPs) bearing polynucleotides is an important stage for successful gene delivery. In this work, we addressed the influence of cell membrane lipids on the integrity and configurational changes of NPs composed of short interfering ribonucleic
Jiachen Sun et al.
Journal of lipid research, 61(6), 945-952 (2020-04-29)
Lipid kinases and phosphatases play key roles in cell signaling and regulation, are implicated in many human diseases, and are thus attractive targets for drug development. Currently, no direct in vitro activity assay is available for these important enzymes, which
Josef Melcr et al.
Journal of chemical theory and computation, 16(1), 738-748 (2019-11-26)
Phosphatidylserine (PS) lipids are important signaling molecules and the most common negatively charged lipids in eukaryotic membranes. The signaling can be often regulated by calcium, but its interactions with PS headgroups are not fully understood. Classical molecular dynamics (MD) simulations
Maria J Sarmento et al.
Langmuir : the ACS journal of surfaces and colloids, 33(43), 12463-12477 (2017-09-30)
Although the evidence for the presence of functionally important nanosized phosphorylated phosphoinositide (PIP)-rich domains within cellular membranes has accumulated, very limited information is available regarding the structural determinants for compartmentalization of these phospholipids. Here, we used a combination of fluorescence
Sonia Rodríguez-Fdez et al.
Cells, 8(12) (2020-01-01)
Phosphatidylinositol-5 phosphate (PI5P) and other mono-phosphoinositides (mono-PIs) play second messenger roles in both physiological and pathological conditions. Despite this, their intracellular targets and mechanisms of action remain poorly characterized. Here, we show that Vav1, a protein that exhibits both Rac1
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