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Luma da Costa Loureiro et al.
Molecular immunology, 122, 163-172 (2020-05-04)
Pulmonary surfactant plays an important role in lung surface tension, defense against invading pathogens, and immune response. Furthermore, alveolar macrophages (AM) that comprise the front line of immune defense against inhaled microorganisms are covered by a layer of pulmonary fluid.
Nuria Roldan et al.
Biophysical journal, 111(8), 1703-1713 (2016-10-21)
To allow breathing and prevent alveolar collapse, lung surfactant (LS) develops a complex membranous system at the respiratory surface. LS is defined by a specific protein and lipid composition, including saturated and unsaturated phospholipid species and cholesterol. Surfactant protein C
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
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
Aishik Chakraborty et al.
Molecules (Basel, Switzerland), 25(3) (2020-02-13)
Understanding interactions between inhaled nanoparticles and lung surfactants (LS) present at the air-water interface in the lung, is critical to assessing the toxicity of these nanoparticles. Specifically, in this work, we assess the impact of engineered carbon nanoparticles (ECN) on
Max Piffoux et al.
ACS nano, 12(7), 6830-6842 (2018-07-06)
Extracellular vesicles (EVs) are recognized as nature's own carriers to transport macromolecules throughout the body. Hijacking this endogenous communication system represents an attractive strategy for advanced drug delivery. However, efficient and reproducible loading of EVs with therapeutic or imaging agents
Shailendra S Rathore et al.
Cell reports, 29(13), 4583-4592 (2019-12-26)
Intracellular vesicle fusion is mediated by soluble N-ethylmaleimide sensitive factor attachment protein receptors (SNAREs) and Sec1/Munc18 (SM) proteins. It is generally accepted that membrane fusion occurs when the vesicle and target membranes are brought into close proximity by SNAREs and
Nicholas M Frame et al.
Journal of molecular biology, 432(7), 1978-1995 (2020-02-10)
Serum amyloid A (SAA) is a plasma protein that transports lipids during inflammation. To explore SAA solution conformations and lipid-binding mechanism, we used hydrogen-deuterium exchange mass spectrometry, lipoprotein reconstitution, amino acid sequence analysis, and molecular dynamics simulations. Solution conformations of
Ahmad Kiani Karanji et al.
Journal of mass spectrometry : JMS, 55(1), e4470-e4470 (2019-11-23)
The first 17 amino acid residues of Huntingtin protein (Nt17 of htt) are thought to play an important role in the protein's function; Nt17 is one of two membrane binding domains in htt. In this study the binding ability of
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
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
Karolina Piecyk et al.
Bioconjugate chemistry, 31(4), 1156-1166 (2020-04-02)
The development of targeted anticancer drugs has been one of the most challenging goals of current research. Eukaryotic translation initiation factor 4E (eIF4E) is an oncogene that stimulates mRNA translation via binding to the 5' endcap structure. It is well
David A Bryce et al.
Analytical chemistry, 90(19), 11509-11516 (2018-09-04)
Interactions of lectins, proteins that selectively bind carbohydrates, play an important role in many biological processes including cell adhesion, immune response, and cell signaling. Given the range of lectin functions and their potential for application in disease detection, there is
Dominika Kozon et al.
Macromolecular bioscience, 19(12), e1900254-e1900254 (2019-11-21)
Polycations, mimicking activity of antibacterial peptides, belong to an important class of molecules investigated as a support or as an alternative to antibiotics. In this work, studies of modified linear amphiphilic statistical polymethyloxazoline (PMOX) and polyethyleneimine copolymers (PMOX_PEI) series are
Eun-Young Lee et al.
Rejuvenation research, 18(3), 245-256 (2015-01-28)
Human growth hormone-1 (GH-1), somatotropin, is a peptide hormone that stimulates cell division in tissues such as bone and cartilage. To compare physiological activities in lipid-free and lipid-bound states, we expressed and incorporated GH-1 in reconstituted high-density lipoprotein (rHDL). GH-1
James Kruczek et al.
Langmuir : the ACS journal of surfaces and colloids, 33(4), 1105-1115 (2017-01-13)
Interactions of monovalent salts with lipid membranes are explored with molecular dynamics (MD) simulations. The simulations included the monovalent ions Na+ and K+, for their importance in physiology, Li+ for its small size and importance in several medical conditions including
Masato Abe et al.
Biochemistry, 56(47), 6268-6280 (2017-11-02)
Remodeling of the acyl chain compositions of cardiolipin (CL) species by the transacylase tafazzin is an important process for maintaining optimal mitochondrial functions. The results of mechanistic studies on the tafazzin-mediated transacylation from phosphatidylcholine (PC) to monolyso-CL (MLCL) in artificial
Wayne Mitchell et al.
The Journal of biological chemistry, 295(21), 7452-7469 (2020-04-11)
Mitochondrial dysfunction underlies many heritable diseases, acquired pathologies, and aging-related declines in health. Szeto-Schiller (SS) peptides comprise a class of amphipathic tetrapeptides that are efficacious toward a wide array of mitochondrial disorders and are believed to target mitochondrial membranes because
Martin Gustavsson et al.
Methods in enzymology, 570, 233-260 (2016-02-29)
The development of methods for expression and purification of seven-transmembrane receptors has led to an increase in structural and biophysical data and greatly improved the understanding of receptor structure and function. For chemokine receptors, this has been highlighted by the
Xiaozheng Xu et al.
The Journal of cell biology, 219(6) (2020-05-22)
Blockade antibodies of the immunoinhibitory receptor PD-1 can stimulate the anti-tumor activity of T cells, but clinical benefit is limited to a fraction of patients. Evidence suggests that BTLA, a receptor structurally related to PD-1, may contribute to resistance to
Guoqing Cao et al.
Journal of lipid research, 52(12), 2169-2176 (2011-10-01)
Cholesteryl ester transfer protein (CETP) catalyses the exchange of cholesteryl ester and triglyceride between HDL and apoB containing lipoprotein particles. The role of CETP in modulating plasma HDL cholesterol levels in humans is well established and there have been significant
Giuseppe Trapani et al.
Frontiers in bioengineering and biotechnology, 8, 427-427 (2020-05-28)
Engineered graphene-based derivatives are attractive and promising candidates for nanomedicine applications because of their versatility as 2D nanomaterials. However, the safe application of these materials needs to solve the still unanswered issue of graphene nanotoxicity. In this work, we investigated
Nicole Harmouche et al.
Biophysical journal, 115(6), 1033-1044 (2018-09-10)
A synergistic enhancement of activities has been described for the amphipathic cationic antimicrobial peptides magainin 2 and PGLa when tested in antimicrobial assays or in biophysical experiments using model membranes. In the presence of magainin 2, PGLa changes from an
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
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
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
Y K Shin et al.
Biophysical journal, 61(6), 1443-1453 (1992-06-01)
A new general method for the determination of electrostatic potentials at biological surfaces is presented. The approach is based on measurement of the collision frequency of a charged nitroxide in solution with a nitroxide fixed to the surface at the
John M Harrington et al.
The Journal of biological chemistry, 285(37), 28659-28666 (2010-07-10)
Trypanosoma brucei is the causative agent of both a veterinary wasting disease and human African trypanosomiasis, or sleeping sickness. The cell membrane of the developmental stage found within the mammalian host, the bloodstream form (BSF), is highly dynamic, exhibiting rapid
Lucile Guyot et al.
Current protocols in protein science, 100(1), e104-e104 (2020-04-15)
Pichia pastoris is a eukaryotic microorganism reputed for its ability to mass-produce recombinant proteins, including integral membrane proteins, for various applications. This article details a series of protocols that progress towards the production of integral membrane proteins, their extraction and
Yo Yano et al.
Biophysical journal, 115(8), 1530-1540 (2018-10-03)
Sphingomyelin is an abundant lipid in some cellular membrane domains, such as lipid rafts. Hydrogen bonding and hydrophobic interactions of the lipid with surrounding components such as neighboring sphingomyelin and cholesterol (Cho) are widely considered to stabilize the raft-like liquid-ordered
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