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DNA damage; DNA repair; analytical chemistry; arginine; biotin; humans; leucine; mass spectrometry; pathogenesis; post-translational modification; quantitative analysis; thiols
Abstract:
... Protein citrullination is a key post-translational modification (PTM) that leads to the loss of positive charge on arginine and consequent protein structural and functional changes. Though it has been indicated to play critical roles in various physiological and pathological processes, effective analytical tools are largely limited due to a few challenges such as the small mass shift induced by th ...
... Monascus comprises purple-red molds. Various compounds can be obtained from these species, including statins and food-safe yellow, red, and orange pigments. However, the secondary metabolite citrinin, a mycotoxin, is produced during the late stages of growth. Citrinin biosynthesis should be reduced to apply Monascus pigments safely. Fortunately, this can be achieved by the addition of flavonoids ( ...
... In the study, a novel sensing strategy based on dual-probe mode, which involved two groups of 2′-fluoro ribonucleic acid (2′-F RNA) modified probes, was designed for the detection of synthetic target double-strand DNA (dsDNA) of PML/RARα fusion genes in APL. And each pair of probes contained a thiolated capture probe (C1 or C2) immobilized on one of electrode surfaces in the dual-channel electroch ...
... Biodegradable polymer-based scaffolds are widely used to provide support during early stages of regeneration and can be functionalized with various chemical groups or bioactive cues to promote desired cellular behavior. However, these scaffolds are often modified post-fabrication, which can lead to undesired changes and homogeneously distributed chemistries that fail to mimic the spatial biochemic ...
... We report a novel strategy for controlled nanostructuring of electrodes surfaces using single-walled nanotubes and nanodiamonds in order to form highly porous structures for biosensors applications. These nanostructures were obtained by subsequent deposition of nanotubes and nanodiamonds followed by functionalization of this assembly with pyrenenitrilotriacteic acid (NTA) via dip coating. The elec ...
... Whereas an organism’s genotype is relatively static throughout life, the epigenome is highly dynamic and can adapt, or be altered, in response to the external environment such as diet. Intrauterine exposure to nutrient availability can alter the establishment of epigenetic marks, not only in the exposed individuals, but also in their offspring. Inheritance of such an environmentally acquired pheno ...
Nematoda; biotin; chemical reactions; chemical structure; messenger RNA; mutants; nucleotides; organic compounds; trans-splicing; translation (genetics)
Abstract:
... Spliced leader (SL) RNA trans-splicing adds a N²,N²,7-trimethylguanosine cap (TMG) and a 22-nucleotide sequence, the SL, to the 5′ end of mRNAs. Both non-trans-spliced with a monomethylguanosine cap (MMG) and trans-spliced mRNAs co-exist in trans-splicing metazoan cells. Efficient translation of TMG-capped mRNAs in nematodes requires a defined core of nucleotides within the SL sequence. Here we pr ...
... We identify here the Arabidopsis (Arabidopsis thaliana) gene encoding the third enzyme in the biotin biosynthetic pathway, dethiobiotin synthetase (BIO3; At5g57600). This gene is positioned immediately upstream of BIO1, which is known to be associated with the second reaction in the pathway. Reverse genetic analysis demonstrates that bio3 insertion mutants have a similar phenotype to the bio1 and ...
Joshua L. Andersen; J. Will Thompson; Kelly R. Lindblom; Erika S. Johnson; Chih-Sheng Yang; Lauren R. Lilley; Christopher D. Freel; M. Arthur Moseley; Sally Kornbluth
... While lysine acetylation in the nucleus is well characterized, comparatively little is known about its significance in cytoplasmic signaling. Here we show that inhibition of the Sirt1 deacetylase, which is primarily cytoplasmic in cancer cell lines, sensitizes these cells to caspase-2-dependent death. To identify relevant Sirt1 substrates, we developed a proteomics strategy, enabling the identific ...
... The purpose of this randomized, placebo-controlled, blind study was to investigate the effects of the drinkable nutraceutical ELASTEN® (QUIRIS Healthcare, Gütersloh, Germany) on skin aging and skin health. Drinking ampoules provides a blend of 2.5 g of collagen peptides, acerola fruit extract, vitamin C, zinc, biotin, and a native vitamin E complex. This controlled interventional trial wa ...
... The suitability of date syrup (Dips) as a substrate for the production of baker’s yeast (Saccharomyces cerevisiae) was examined and compared with molasses substrate as a reference. With regard to nutrient content, Dips compares very well with molasses in this respect. Dips contains more sugars, biotin and pantothenic acid than molasses, about similar contents of nitrogen, phosphorus and magnesium, ...
My Tuyen Thi Nguyen; Jieun Kim; Hyunjun Lee; Soyoon Won; Yongki Kim; Ji A. Jung; Dan Li; Xuan Hong Mai To; Khanh Trang Nguyen Huynh; Thanh Van Le; Beenish Israr; Hyun Joo An; Jaehan Kim
biotin; breast milk; folic acid; humans; information; lutein; milk; nutritional status; pantothenic acid; pyridoxine; riboflavin; thiamin; vitamin A; vitamin A deficiency; China; Korean Peninsula; Pakistan; Vietnam
Abstract:
... Vitamins are the essential elements for human life and, particularly, for infant health. Human milk is the best source of nutrients for newborns, however, the information of vitamins in Asian maternal milk is still limited. In this study, we have collected 580 Asian maternal milk samples from Korea (n = 254), China (n = 137), Pakistan (n = 92), and Vietnam (n = 97). The vitamin concentrations, inc ...
... Following the analysis of transposon Tn5432-induced mutants of Corynebacterium glutamicum ATCC 13032, a gene encoding a protein with a biotin-binding motif was cloned. The DNA sequence of this gene revealed an open reading frame encoding 591 amino acids with a calculated mol. mass of 63.4 kDa. The protein is composed of two domains, an N-terminal biotin carboxylase and a C-terminal biotin-carboxyl ...
antibodies; biotin; digoxigenin; folic acid; oligonucleotides; proteins; vitamin D
Abstract:
... Optical detection of molecular targets typically requires immobilization, separation, or chemical or enzymatic processing. An important exception is aptamers that allow optical detection in solution based on conformational changes. This method, however, requires the laborious selection of aptamers with high target specificity and affinity, and the ability to undergo the required conformational cha ...
biotin; cameras; cations; ecotoxicology; fluorescence; health services; humans; instrumentation; lakes; lead; magnetic separation; magnetism; mobile telephones; monitoring
Abstract:
... Rapid, portable, and efficient detection of lead cations (Pb²⁺) is of great significance for monitoring and evaluating environmental toxicity and human healthcare. In this work, we developed a simple and low-cost homogenous fluorescence DNAzyme assay for Pb²⁺ determination based on Pb²⁺-dependent cleaving and rolling circle amplification (RCA). DNAzyme and its substrate (5′-biotin) formed double-s ...
... The purpose of this randomized, placebo-controlled, triple-blind trial on 60 healthy female volunteers was to assess the cosmetic effects on skin quality of a food supplement containing special collagen peptides together with acerola extract, vitamin C, vitamin E, biotin, and zinc after an intake of 12 weeks (Elasten®, QUIRIS Healthcare, Germany). To reduce assessment bias maximally and increase t ...
... One of critical steps in genome editing by CRISPR-Cas9 is to deliver the CRISPR-Cas9 system into targeted cells. In this study, we developed a dual-targeting delivery system based on polymer/inorganic hybrid nanoparticles to realize highly efficient genome editing in targeted tumor cells as well as in situ detection on the related protein expression in edited cells. The CRISPR-Cas9 plasmid for CDK ...
... Quantitative analysis of biotin in biological fluids, foods, and pharmaceutical is important for diagnosis and treatment of biotin‐related diseases and health maintenance. In this work, a novel G‐quadruplex/hemin DNAzyme‐based microchip electrophoresis chemiluminescence (CL) assay method was established for rapid and highly sensitive detection of biotin. This method is based on the specific bindin ...
Lin Wanjuan; Hou Yi; Lu Yijie; Abdelrahman Ahmed I.; Cao Pengpeng; Zhao Guangyao; Tong Lemuel; Qian Jieshu; Baranov Vladimir; Nitz Mark; Winnik Mitchell A.
... This paper addresses the question of whether one can use lanthanide nanoparticles (e.g., NaHoF₄) to detect surface biomarkers expressed at low levels by mass cytometry. To avoid many of the complications of experiments on live or fixed cells, we carried out proof-of-concept experiments using aqueous microgels with a diameter on the order of 700 nm as a proxy for cells. These microgels were used to ...
... We report here on a new potentiometric biosensing principle for the detection of antibody–antigen interactions at the sensing membrane surface without the need to add a label or a reporter ion to the sample solution. This is accomplished by establishing a steady-state outward flux of a marker ion from the membrane into the contacting solution. The immunobinding event at the sensing surface retards ...
... Solvent reorganization can contribute significantly to the energetics of protein–protein interactions. However, our knowledge of the magnitude of the energetic contribution is limited, in part, by a dearth of quantitative experimental measurements. The biotin repressor forms a homodimer as a prerequisite to DNA binding to repress transcription initiation. At 20 °C, the dimerization reaction, which ...
Aurélie Mousnier; Gunnar N. Schroeder; Charlotte A. Stoneham; Ernest C. So; James A. Garnett; Lu Yu; Steve J. Matthews; Jyoti S. Choudhary; Elizabeth L. Hartland; Gad Frankel
Escherichia coli; Legionella pneumophila; affinity chromatography; biotin; biotinylation; endoplasmic reticulum; guanosinetriphosphatase; mass spectrometry; nickel; nitrilotriacetic acid; pathogens; purification methods; streptavidin; two hybrid system techniques; type IV secretion system; vacuoles
Abstract:
... Legionella pneumophila , the causative agent of Legionnaires’ disease, uses the Dot/Icm type IV secretion system (T4SS) to translocate more than 300 effectors into host cells, where they subvert host cell signaling. The function and host cell targets of most effectors remain unknown. PieE is a 69-kDa Dot/Icm effector containing three coiled-coil (CC) regions and 2 transmembrane (TM) helices follow ...
... Endoplasmic reticulum (ER) membrane contact sites (MCSs) mark positions where endosomes undergo fission for cargo sorting. To define the role of ER at this unique MCS, we targeted a promiscuous biotin ligase to cargo-sorting domains on endosome buds. This strategy identified the ER membrane protein TMCC1, a member of a conserved protein family. TMCC1 concentrates at the ER-endosome MCSs that are s ...
T-lymphocytes; biotin; cytotoxicity; hydrodynamics; immunotherapy; iron oxides; ligands; magnetism; streptavidin
Abstract:
... Magnetic nanoparticle is an important branch of nanomaterials, especially magnetic iron oxide (Fe₃O₄) nanoparticles have attracted widespread attention due to the fact that they can be used not only as high-sensitivity magnetic resonance contrast agents, but also as carriers for the construction of multifunctional and intelligent nanoprobes. The functional ligands modified on the surface of nanopr ...
... For an assay to be most effective in point-of-care clinical analysis, it needs to be economical, simple, generalizable, and free from tedious workflows. While electrochemistry-based DNA sensors reduce instrumental costs and eliminate complicated procedures, there remains a need to address probe costs and generalizability, as numerous probes with multiple conjugations are needed to quantify a wide ...
... We demonstrate a DNA double-write process that uses UV to pattern a uniquely designed DNA write material, which produces two distinct binding identities for hybridizing two different complementary DNA sequences. The process requires no modification to the DNA by chemical reagents and allows programmed DNA self-assembly and further UV patterning in the UV exposed and nonexposed areas. Multilayered ...
... Silver crucian carp (Carassius auratus gibelio Bloch), as a gynogenetic fish, is a promising model for the study of the evolutionary genetics of vertebrates. We have developed 59 polymorphic trinucleotide and tetranucleotide markers for the silver crucian carp through the biotin capture method and radioactive-labeling hybridization. The number of alleles ranged from 2 to 12 in the population, and ...
Salmonella; biotin; bulls; carbonated beverages; diagnostic techniques; energy transfer; fluorescence; food chemistry; food safety; green tea; human health; milk; orange juice; probability; reaction kinetics; safety assessment; signal-to-noise ratio; streptavidin; tap water
Abstract:
... Accurate and rapid quantification of foodborne pathogens is of great significance for food safety and human health. In this work, we have successfully constructed a fluorescence quenching collapsar probe (FQCP) on the basis of a conventional aptamer-encoded molecular beacon (AEMB) and applied it for the detection of Salmonella. In structure, the FQCP is assembled by AEMBs in fours via specific str ...
binding capacity; binding sites; biotin; ionization; point mutation; streptavidin
Abstract:
... We report a detailed study of a point mutation of the crucial binding site residue, D128, in the biotin–streptavidin complex. The conservative substitution, D128N, preserves the detailed structure observed for the wild-type complex but has an only minimal impact on biotin binding, even though previous experimental and computational studies suggested that a charged D128 residue was crucial for high ...
... Plasma membrane (PM) proteins contribute to the identity of a cell, mediate contact and communication, and account for more than two-thirds of known drug targets.1−8 In the past years, several protocols for the proteomic profiling of PM proteins have been described. Nevertheless, comparative analyses have mainly focused on different variations of one approach.9−11 We compared sulfo-NHS-SS-biotinyl ...
... CD36 is an integral membrane protein that mediates the cellular uptake of oxidized low-density lipoprotein (oxLDL) through recognition of the oxidized glycerophospholipids (oxPLs) formed during LDL oxidation. We aimed to devise an assay system to detect binding between CD36 and oxLDL/oxPL without using recombinant proteins. A peptide corresponding to amino-acid residues 149–168 of mouse CD36 with ...
... A molecular signal displayed on the external surface of one population of vesicles was used to trigger a catalytic process on the inside of a second population of vesicles. The key recognition event is the transfer of a protein (NeutrAvidin) bound to vesicles displaying desthiobiotin to vesicles displaying biotin. The desthiobiotin–protein complex was used to anchor a synthetic transducer in the o ...
... Based on streptavidin coated nanospheres and T7 exonuclease assisted dual-cycle signal amplification, we developed a novel sensitive fluorescence polarization detection method for miRNA. When target miRNA was present in the system, hairpin probe hybridized with miRNA, forming a double-stranded structure. The 5′ end of hairpin probe was then recognized and digested by T7 exonuclease, releasing the ...
... Fusarium wilt results in undesirable effects on the quality and production of chieh-qua (Benincasa hispida Cogn. var. Chieh-qua How). Fusaric acid (FA), a secondary metabolite of biotin produced by pathogens of genus Fusarium, induced resistant responses in chieh-qua; however, the physiological and molecular mechanism(s) of FA resistance remains largely unknown. In our study, ‘A39’ (FA-resistant c ...
Omar Scapolan; Andrea N. Mazzarello; Maria Bono; Marzia Occhino; Vasily Ogryzko; Marco Bestagno; Paolo Scartezzini; Silvia Bruno; Franco Fais; Fabio Ghiotto
... Recombinant-tagged proteins have a widespread use in experimental research as well as in clinical diagnostic and therapeutic approaches. Well-stocked sets of differently tagged variants of a same protein would be of great help. However, the construction of differently tagging vectors is a demanding task since cloning procedures need several tailored DNA inserts. In this study, we describe a novel ...
... The CRISPR/Cas9 revolution is profoundly changing the way life sciences technologies are used. Many assays now rely on engineered clonal cell lines to eliminate the overexpression of bait proteins. Control cell lines are typically nonengineered cells or engineered clones, implying a considerable risk for artifacts because of clonal variation. Genome engineering can also transform BioID, a proximit ...
... The goal of this research was to develop linkage chemistry for the study of bivalent interactions between a receptor and its ligand using atomic force microscopy (AFM) and surface plasmon resonance (SPR). We conceived a three-arm structure composed of flexible chains connected to a large rigid core with orthogonal functional groups at their ends for formation and attachment (or immobilization) of ...
acoustics; biosensors; biotin; epithelium; films (materials); mucins; neoplasms; streptavidin
Abstract:
... AlN thin film bulk acoustic resonators (FBARs) with a resonant frequency of ∼575 MHz have been fabricated to function as an epithelial tumor marker mucin 1 (MUC1) biosensor. Streptavidin was assembled on the sensitive area of FBAR. After the recognition between aptamers–AuNP conjugates and MUC1, biotin, along with the conjugates, was captured by streptavidin onto the surface of FBARs. Therefore, t ...
alanine; aldehydes; aspartic acid; avidin; biotin; bovine serum albumin; chromatography; glutamic acid; glutamine; humans; ions; isoleucine; leucine; lysine; methionine; oxidation; oxidative stress; peptides; protein structure; tandem mass spectrometry; valine
Abstract:
... Protein carbonylation is an irreversible protein oxidation correlated with oxidative stress, various diseases and ageing. Here we describe a peptide-centric approach for identification and characterisation of up to 14 different types of carbonylated amino acids in proteins. The modified residues are derivatised with biotin-hydrazide, enriched and characterised by tandem mass spectrometry. The stre ...
bioactive properties; biotin; fluorescence; human cell lines; hydrophilicity; image analysis; in vitro studies; irradiation; mice; models; moieties; neoplasms; photochemotherapy; photosensitizing agents; polyethylene glycol; silicon; tissue distribution; water solubility
Abstract:
... Phthalocyanines (Pcs) are a kind of potential photosensitizers for fluorescence imaging and photodynamic therapy (PDT). However, the clinical application of Pcs is suffered from their poor solubility, high aggregation tendency and low tumor-specificity. To address these problems, two biotin moieties were linked to the axial positions of silicon(IV) phthalocyanine (SiPc) through hydrophilic polyeth ...
... A cancer cell targeted fluorescent viscosity probe has been designed and synthesized to specifically visualise viscosity changes in biotin receptor (BiR) positive cells over biotin negative cells via dual-mode fluorescence imaging: fluorescence intensity mode and fluorescence lifetime mode. ...
biotin; cell viability; chemical compounds; chemical reactions; drug delivery systems; fluorescence; human cell lines; neoplasms
Abstract:
... Herein, we present a fluorescent-peptide drug delivery system composed of biotin–naphthalimide–HJ inhibitor peptide2, prodrug 1. Treatment of 1 to biotin receptor-positive HepG2 cells, which are resistant to high concentrations of the HJ inhibitor peptide2, decreased cell viability and increased intracellular fluorescence. ...
biotin; chemical reactions; formaldehyde; neoplasm cells; neoplasms; tissues
Abstract:
... A biotin appended formaldehyde sensor was found to specifically visualise both exogenous and endogenous levels of formaldehyde in biotin receptor positive cells over biotin negative cells by means of one- and two-photon excitation. The probe furthermore visualised endogenous levels of formaldehyde in tumour tissue slices up to 70 μm depth. ...
... Hydrogen sulfide (H₂S), a well-known signaling molecule, exerts significant regulatory effects on the cardiovascular and nervous systems. Therefore, monitoring the metabolism of H₂S offers a potential mechanism to detect various diseases. In addition, biotin is significantly used as a targeting group to detect cancer cells exclusively. In this work, a biotin-guided benzoxadizole-based fluorescent ...
... A novel biotin-inducible DNA locus, bioS, was found in Rhizobium meliloti 1021 by mutation with a transposable promoter probe. The promoterless nptII reporter responded to 40 nM biotin with a sixfold increase in NPTII protein. Stationary-phase mutant cells accumulated 50% more 14C-biotin than corresponding wild-type cells. The prototrophic mutant competed equally with the wild type in biotin-free ...
... Hydrogen sulfide (H₂S) could induce the proliferation of cancer cells in a concentration-dependent manner, and has close relation with the tumor growth. Monitoring the H₂S level in real-time is of great important for understanding its roles in the cancer cell proliferation and the diagnosis of the tumor. Herein, a novel cancer cell-specific two-photon fluorescent probe BN-H₂S for detecting H₂S in ...
... A simple off-column capillary electrophoretic (CE) assay for measuring acetyl coenzyme A carboxylase holoenzyme (holo-ACC) activity and inhibition was developed. The two reactions catalyzed by the holo-ACC components, biotin carboxylase (BC) and carboxyltransferase (CT), were simultaneously monitored in this assay. Acetyl coenzyme A (CoA), malonyl-CoA, adenosine triphosphate (ATP), and adenosine d ...
G-protein coupled receptors; Haemophilus influenzae; active sites; antibiotics; bacteria; biosynthesis; biotin; drug resistance; fastidious bacteria; fatty acids; genes; humans; mechanism of action; pathogens; pharmacology; protein kinases; screening
Abstract:
... As the need for novel antibiotic classes to combat bacterial drug resistance increases, the paucity of leads resulting from target-based antibacterial screening of pharmaceutical compound libraries is of major concern. One explanation for this lack of success is that antibacterial screening efforts have not leveraged the eukaryotic bias resulting from more extensive chemistry efforts targeting euk ...
acrolein; biotin; human serum albumin; liquid chromatography; proteomics; streptavidin; tandem mass spectrometry
Abstract:
... The utility of a new, cleavable tag for identifying and enriching protein carbonyls is examined. Using a model system, human serum albumin modified with acrolein, the EZ-Link alkoxyamine-PEG₄-SS-PEG₄-biotin affinity tag, was tested for its ability to label protein carbonyls in proteomic analyses of protein carbonylation. The efficiency of the labeling was assayed and compared to standard biotin hy ...
biotin; chemical communication; chemical reactions; copper; glutamine; peptides; proteins
Abstract:
... The Cu(i)-mediated click reaction of proteins with affinity tags enables their selective isolation from complex mixtures. However, irreversible protein modification limits the interpretation of results from subsequent biophysical and biochemical assays. We report a facile and modular chemical strategy to reversibly modify peptides and proteins with biotin and FLAG affinity tags at a clickable glut ...