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Clare A Peters Libeu et al.
PloS one, 7(6), e40027-e40027 (2012-07-07)
One of the events associated with Alzheimer's disease is the dysregulation of α- versus β-cleavage of the amyloid precursor protein (APP). The product of α-cleavage (sAPPα) has neuroprotective properties, while Aβ1-42 peptide, a product of β-cleavage, is neurotoxic. Dimerization of
Sandeep Dave et al.
International journal of biological macromolecules, 49(4), 536-542 (2011-07-09)
Stem bromelain (SBM) is a therapeutic protein that has been studied for alkaline denaturation in the intestines, the principal site of its absorption. In this study, we investigated fluorinated alcohol 2,2,2-trifluoroethanol (TFE)-induced conformational changes in the specific/pre-molten globule (SMG) state
Gulam Rabbani et al.
Cell biochemistry and biophysics, 61(3), 551-560 (2011-08-13)
Acid unfolding pathway of conalbumin (CA), a monomeric glycoprotein from hen egg white, has been investigated using far- and near-UV CD spectroscopy, intrinsic fluorescence emission, extrinsic fluorescence probe 1-anilino-8-napthalene sulfonate (ANS) and dynamic light scattering (DLS). We observe pH-dependent changes
V G Artyukhov et al.
Bulletin of experimental biology and medicine, 153(6), 907-911 (2012-11-01)
Structural and functional state of human blood lymphocytes after exposure to UV light (240-390 nm) in doses of 151-1359 J/m(2) was studied by methods of laser flow cytofluorometry, indirect immunofluorescence, and fluorescent probes. Using a combination of these methods, we
Chang Li et al.
International journal of biological macromolecules, 49(5), 910-916 (2011-08-23)
In our study, we showed that at a relatively low concentration, H(2)O(2) can irreversibly inactivate the human brain type of creatine kinase (HBCK) and that HBCK is inactivated in an H(2)O(2) concentration-dependent manner. HBCK is completely inactivated when incubated with
James A McLure et al.
Drug metabolism and disposition: the biological fate of chemicals, 39(9), 1711-1717 (2011-05-26)
The fluorescence of 1-anilinonaphthalene-8-sulfonate (ANS) in the presence of human liver microsomes (HLMs) is altered by drugs that bind nonspecifically to the lipid bilayer. The present study characterized the relationship between the nonspecific binding (NSB) of drugs to HLMs as
Dimitra Georgiadou et al.
PloS one, 6(11), e27037-e27037 (2011-11-10)
Apolipoprotein E (apoE) is a major protein of the lipoprotein transport system that plays important roles in lipid homeostasis and protection from atherosclerosis. ApoE is characterized by structural plasticity and thermodynamic instability and can undergo significant structural rearrangements as part
Gabriel Gibrat et al.
Biochimica et biophysica acta, 1844(9), 1560-1568 (2014-05-28)
Apo-calmodulin, a small soluble mainly α protein, is a calcium-dependent protein activator. Calcium binding affects the calmodulin conformation but also its stability. Calcium free form unfolds between 40 and 80°C, whereas the calcium-saturated form is stable up to temperatures as
Beiwen Zheng et al.
PloS one, 6(5), e19510-e19510 (2011-05-26)
The scavenging ability of sufficient divalent metal ions is pivotal for pathogenic bacteria to survive in the host. ATP-binding cassette (ABC)-type metal transporters provide a considerable amount of different transition metals for bacterial growth. TroA is a substrate binding protein
Rebecca L Smathers et al.
PloS one, 7(6), e38459-e38459 (2012-06-16)
4-Hydroxynonenal (4-HNE) is a reactive α,β-unsaturated aldehyde produced during oxidative stress and subsequent lipid peroxidation of polyunsaturated fatty acids. The reactivity of 4-HNE towards DNA and nucleophilic amino acids has been well established. In this report, using proteomic approaches, liver
Stefan Kofler et al.
Journal of molecular biology, 422(1), 109-123 (2012-05-29)
The ability of pathogenesis-related proteins of family 10 to bind a broad spectrum of ligands is considered to play a key role for their physiological and pathological functions. In particular, Bet v 1, an archetypical allergen from birch pollen, is
Yoshimi Sueishi et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 114, 344-349 (2013-06-22)
The association constants (K) for the inclusion complexation of four kinds of cyclodextrins (CDs (β- and γ-), 2,6-di-O-methylated β-CD, and 2,3,6-tri-O-methylated β-CD) and cucurbit[7]uril (CB[7]) with 1,8- and 2,6-anilinonaphthalene sulfonic acids (ANSs) were determined from fluorescence spectra enhanced by inclusion.
Afshin Iram et al.
Archives of biochemistry and biophysics, 533(1-2), 69-78 (2013-03-19)
TFE induces structural alterations of proteins similar to the lipid environment of biological membranes, implicating these studies worthy of analyzing protein conformation in membranes such as red blood cells (RBCs). Heme loss occurs on rupturing of RBCs as found in
Zhenyu Zuo et al.
The protein journal, 31(7), 585-591 (2012-08-10)
The interactions between Urinary Trypsin Inhibitor (UTI) and 1-anilino-8-naphthalene sulfonate (ANS) were investigated by fluorescence spectra, isothermal titration calorimetry and molecular modeling. The results revealed the presence of four specific binding sites for ANS on UTI, with interactions driven mainly
Walter G Gonzalez et al.
Biochimica et biophysica acta, 1844(9), 1472-1480 (2014-05-24)
DREAM (calsenilin or KChIP-3) is a calcium sensor involved in regulation of diverse physiological processes by interactions with multiple intracellular partners including DNA, Kv4 channels, and presenilin, however the detailed mechanism of the recognition of the intracellular partners remains unclear.
Huan Huang et al.
The FEBS journal, 281(9), 2266-2283 (2014-03-19)
The human liver fatty acid-binding protein (L-FABP) T94A variant, the most common in the FABP family, has been associated with elevated liver triglyceride levels. How this amino acid substitution elicits these effects is not known. This issue was addressed using
Shilpi Gupta et al.
Small (Weinheim an der Bergstrasse, Germany), 9(6), 894-904 (2012-12-12)
A new class of non-ionic dendronized multiamphiphilic polymers is prepared from a biodegradable (AB)n-type diblock polymer synthesized from 2-azido-1,3-propanediol (azido glycerol) and polyethylene glycol (PEG)-600 diethylester using Novozym-435 (Candida antarctica lipase) as a biocatalyst, following a well-established biocatalytic route. These
William J Andrews et al.
Molecular and cellular biochemistry, 371(1-2), 217-223 (2012-09-05)
IQGAPs are cytoskeletal scaffolding proteins which collect information from a variety of signalling pathways and pass it on to the microfilaments and microtubules. There is a well-characterised interaction between IQGAP and calmodulin through a series of IQ-motifs towards the middle
Ryan P Lamers et al.
PloS one, 8(3), e60666-e60666 (2013-04-02)
Active efflux of antimicrobial agents is a primary mechanism by which bacterial pathogens can become multidrug resistant. The combined use of efflux pump inhibitors (EPIs) with pump substrates is under exploration to overcome efflux-mediated multidrug resistance. Phenylalanine-arginine β-naphthylamide (PAβN) is
Gulam Rabbani et al.
Cell biochemistry and biophysics, 62(3), 487-499 (2012-01-05)
Here, we have characterized four pH-dependent states: alkaline state, "B" (pH 9.0), native state, "N" (pH 7.4), acid-induced state, "A" (pH 2.2) and molten globule state, "MG" (pH 1.8) of Rhizopus niveus lipase (RNL) by CD, tryptophanyl fluorescence, ANS binding
Kevin C Hadley et al.
Cell stress & chaperones, 16(5), 549-561 (2011-04-13)
The inability of cells to maintain protein folding homeostasis is implicated in the development of neurodegenerative diseases, malignant transformation, and aging. We find that multiphoton fluorescence imaging of 1-anilinonaphthalene-8-sulfonate (ANS) can be used to assess cellular responses to protein misfolding
Tsuyoshi Konuma et al.
Proteins, 81(1), 107-118 (2012-08-29)
Chemical shift perturbations (CSPs) in NMR spectra provide useful information about the interaction of a protein with its ligands. However, in a multiple-ligand-binding system, determining quantitative parameters such as a dissociation constant (K(d) ) is difficult. Here, we used a
Silvia Zorrilla et al.
Methods in molecular biology (Clifton, N.J.), 952, 237-252 (2012-10-27)
Transcription factors of the peroxisome proliferator-activated receptor (PPAR) family are ligand-activated receptors that play key roles in lipid metabolism and inflammation. The γ isoform (PPARγ) is involved in adipocyte differentiation, insulin sensitization, and vascular pathophysiology, including inflammation and atherosclerosis, for
Sergio B Kaufman et al.
The journal of physical chemistry. B, 116(10), 3421-3429 (2012-01-31)
Folding and structural stability are key factors for the proper biological function of proteins. Na(+),K(+)-ATPase is an integral membrane protein involved in the active transport of Na(+) and K(+) across the plasma membrane. In this work we characterized the effects
Jan Holm et al.
Biochemical and biophysical research communications, 425(1), 19-24 (2012-07-21)
High affinity folate binding protein (FBP) regulates as a soluble protein and as a cellular receptor intracellular trafficking of folic acid, a vitamin of great importance to cell growth and division. We addressed two issues of potential importance to the
L V Belovolova et al.
Biofizika, 56(2), 197-204 (2011-05-06)
For investigation of influence of reactive oxygen species on biological systems the peculiarities of light scattering and fluorescence spectra of aqueous solutions in the presence of photoactive additions of acetone (5 x 10(-4) - 30) and anionic probe ANS (5
C S Szasz et al.
Biochemistry, 50(26), 5834-5844 (2011-06-04)
Crowding caused by the high concentrations of macromolecules in the living cell changes chemical equilibria, thus promoting aggregation and folding reactions of proteins. The possible magnitude of this effect is particularly important with respect to the physiological structure of intrinsically
Yue-Xiu Si et al.
Bioscience, biotechnology, and biochemistry, 76(6), 1091-1097 (2012-07-14)
We studied the inhibitory effects of isorhamnetin on mushroom tyrosinase by inhibition kinetics and computational simulation. Isorhamnetin reversibly inhibited tyrosinase in a mixed-type manner at Ki=0.235±0.013 mM. Measurements of intrinsic and 1-anilinonaphthalene-8-sulfonate(ANS)-binding fluorescence showed that isorhamnetin did not induce significant
Andrea Pica et al.
Biochimica et biophysica acta, 1824(4), 571-577 (2012-02-11)
γ-glutamyltranspeptidases (γ-GTs) are ubiquitous enzymes that catalyze the hydrolysis of γ-glutamyl bonds in glutathione and glutamine and the transfer of the released γ-glutamyl group to amino acids or short peptides. These enzymes are generally synthesized as precursor proteins, which undergo
Irina M Kuznetsova et al.
PloS one, 7(7), e40845-e40845 (2012-07-26)
In this work we return to the problem of the determination of ligand-receptor binding stoichiometry and binding constants. In many cases the ligand is a fluorescent dye which has low fluorescence quantum yield in free state but forms highly fluorescent
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