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International Journal of Biological Macromolecules

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https://www.readbyqxmd.com/read/28645765/chitosan-surface-modified-electrospun-poly-%C3%AE%C2%B5-caprolactone-carbon-nanotube-composite-fibers-with-enhanced-mechanical-cell-proliferation-and-antibacterial-properties
#1
Siyu Wang, Yumei Li, Rui Zhao, Toufeng Jin, Li Zhang, Xiang Li
The surface modification is one of the most effective methods to improve the bioactivity and cell affinity effect of electrospun poly(ε-caprolactone) (PCL) fibers. In the present study, chitosan (CS), a cationic polysaccharide, was used to modify the surface of electrospun PCL fibers. To obtain strong interaction between CS and PCL fibers, negatively charged PCL fibers were prepared by the incorporation of acid-treated carbon nanotubes (CNTs) into the fibers. In this way, the positively charged chitosan could be immobilized onto the surface of PCL fibers tightly by the electrostatic attraction...
June 20, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28645764/electrochemical-behavior-of-pb-ii-on-a-heparin-modified-chitosan-graphene-nanocomposite-film-coated-glassy-carbon-electrode-and-its-sensitive-detection
#2
Priya T, Dhanalakshmi N, Thinakaran N
In this study, we developed a novel composite material containing biological macromolecules like heparin and chitosan coated on reduced graphene oxide (rGO) for the modification of glassy carbon electrode (hep/CS-rGO/GC). It can be applied for the sensitive electrochemical detection of Pb(2+) by square wave anodic stripping voltammetry (SWASV). The physicochemical analysis such as XRD, FTIR, FESEM and Raman spectroscopy techniques revealed that an effective functionalization occurred at the rGO surface. The consequence of deposition and stripping of metal ions by various electrochemical parameters such as supporting electrolytes, pH value, deposition potential, and deposition time were carefully studied and optimized...
June 20, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28642114/%C3%AE-d-glucan-from-antrodia-camphorata-ameliorates-lps-induced-inflammation-and-ros-production-in-human-hepatocytes
#3
Qiuli Chen, Huiling Tang, Zhengqi Zha, Hongping Yin, Ying Wang, Yufeng Wang, Haitao Li, Long Yue
A water soluble Antrodia Camphorata polysaccharide was composed of β-D-glucan, coded as ACP1. ACP1 was derived from cultured Antrodia Camphorata powder, which was extracted, separated and purified by DEAE-52 column and Sephadex G-100 chromatography. The molecular weight of ACP1 was 1.72×10(4)Da, and ACP1 consisted of glucose and galactose in the mole ratio of 2.21:1. Structural identification by FTIR, GC-MS and NMR, inferred that ACP1 consisted of →1,3)-linked-β-D-Glcp-(6→, →3)-linked-β-D-Glcp-(1→, and →6)-linked-α-D-Galp-(1→, with terminal β-D-Glcp and β-D-Galp...
June 19, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28636878/lycium-barbarum-polysaccharide-alleviates-nonylphenol-exposure-induced-testicular-injury-in-juvenile-zebrafish
#4
Ze-Yong Tang, Dong Sun, Chun-Wei Qian, Qi Chen, Shun-Shan Duan, Sheng-Yun Sun
Nonylphenol is an endocrine disrupting chemicals that can disrupt the organisms' reproductive system, and exists widely in rivers and lakes. Lycium barbarum polysaccharide (LBP) is the main active constituent (about 10%) in Lycium barbarum, which is used to protect reproductive health. In this study, we investigated whether LBP can alleviate nonylphenol exposure induced testicular injury in juvenile zebrafish. We detected histological alteration, anti-oxidant enzyme profile and P450 gene transcription to assess LBP effect on testicular development...
June 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28636877/lectin-cgl-from-the-sea-mussel-crenomytilus-grayanus-induces-burkitt-s-lymphoma-cells-death-via-interaction-with-surface-glycan
#5
Oleg Chernikov, Alexandra Kuzmich, Irina Chikalovets, Valentina Molchanova, Kuo-Feng Hua
Marine organisms are rich sources of lectins. Lectins are able to bind specifically and reversibly to different types of carbohydrates or glycoproteins. The present study reports the evaluation of glycan binding profile and anti-tumor potential of lectin CGL from the sea mussel Crenomytilus grayanus. Glycan array assay revealed that CGL was able to bind both α and β anomer of galactose, but interaction with the αGal-terminated glycans was stronger. Analysis of most common glycan motifs for CGL showed high affinity to Galα1-4Galβ1-4GlcNAc motif similar to globotriose structure (Gb3: Galα1-4Galβ1-4Glc), the epitope of globotriaosylceramide...
June 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28634062/site-directed-mutagenesis-of-gh10-xylanase-a-from-penicillium-canescens-for-determining-factors-affecting-the-enzyme-thermostability
#6
Yury A Denisenko, Alexander V Gusakov, Aleksandra M Rozhkova, Dmitry O Osipov, Ivan N Zorov, Veronika Yu Matys, Igor V Uporov, Arkady P Sinitsyn
In order to investigate factors affecting the thermostability of GH10 xylanase A from Penicillium canescens (PcXylA) and to obtain its more stable variant, the wild-type (wt) enzyme and its mutant forms, carrying single amino acid substitutions, were cloned and expressed in Penicillium verruculosum B1-537 (niaD-) auxotrophic strain under the control of the cbh1 gene promoter. The recombinant PcXylA-wt and I6V, I6L, L18F, N77D, Y125R, H191R, S246P, A293P mutants were successfully expressed and purified for characterization...
June 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28634061/isolation-of-a-protease-resistant-and-ph-stable-%C3%AE-galactosidase-displaying-hydrolytic-efficacy-toward-raffinose-family-oligosaccharides-from-the-button-mushroom-agaricus-bisporus
#7
Yujing Hu, Mengjuan Zhu, Guoting Tian, Liyan Zhao, Hexiang Wang, Tzi Bun Ng
A 45-kDa monomeric acidic α-galactosidase with a specific activity of 193.12 units/mg was isolated from the fruiting bodies of Agaricus bisporus. Blast search of internal peptide sequences suggested that it is a member of GH family 27 and it is most similar to hypothetical protein AGABI2DRAFT_70106. The enzyme displayed maximal activity at pH 4.0 and 60°C, respectively. The enzyme remained stable within the pH range 2.0-9.0 but its activity was markedly suppressed in the presence of Cu(2+), Hg(2+), Fe(3+) and Ag(+) ions...
June 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28634060/potent-inhibitions-of-monoamine-oxidase-a-and-b-by-acacetin-and-its-7-o-6-o-malonylglucoside-derivative-from-agastache-rugosa
#8
Hyun Woo Lee, Hyung Won Ryu, Seung Cheol Baek, Myung-Gyun Kang, Daeui Park, Hyoung-Yun Han, Ju Hyeon An, Sei-Ryang Oh, Hoon Kim
Five compounds were isolated from the leaves of Agastache rugosa and tested for monoamine oxidase (MAO) inhibitory activity. Acacetin, a flavonoid, potently inhibited recombinant human MAO-A and MAO-B (IC50=0.19 and 0.17μM, respectively), and reversibly and competitively inhibited MAO-A and MAO-B (Ki=0.045 and 0.037μM, respectively). Acacetin 7-O-(6-O-malonylglucoside) (AMG) was also found to effectively inhibit MAO-A and MAO-B (IC50=2.34 and 1.87μM, respectively), and to reversibly and competitively inhibit MAO-A and MAO-B (Ki=1...
June 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28634059/a-pumpkin-polysaccharide-induces-apoptosis-by-inhibiting-the-jak2-stat3-pathway-in-human-hepatoma-hepg2-cells
#9
Weixi Shen, Chunhong Chen, Yuanyuan Guan, Xiaowei Song, Yinghua Jin, Jingfang Wang, Yu Hu, Tao Xin, Qiuying Jiang, Li Zhong
The purpose of this study is to investigate the effect of a purified polysaccharide (PPPF) from pumpkin fruit on the Janus activated kinase (JAK)/signal transducer and activator of transcription (STAT) signaling during apoptotic process. The results showed that PPPF or STAT3 siRNA inhibits the cell growth of HepG2 cells via induction of apoptosis. Moreover, PPPF is able to suppress both constitutive and IL-6-induced phosphorylation of STAT3 (on Tyr705) and subsequent nuclear translocation in cancer cells. Such inhibition is found to be achieved through down-regulation of constitutive phosphorylation of JAK2, but not JAk1, c-Src, ERK1/2, and Akt, which means STAT3 tyrosine phosphorylation in HepG2 cells following PPPF treatment is associated with a reduction in JAK2 activity...
June 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28634058/apoptotic-gene-expression-profiles-and-dna-damage-levels-in-rat-liver-treated-with-perfluorooctane-sulfonate-and-protective-role-of-curcumin
#10
Dilek Eke, Ayla Çelik, Bertan Yilmaz, Nurcan Aras, Sabriye Kocatürk Sel, Davut Alptekin
Perfluorinated compounds (PFCs) such as PFOS and PFOA, are xenobiotics that can be detected worldwide in the environment and humans. PFOS (C8F17SO3(-)) is a fluorinated organic compound has been used for decades in industrial and commercial products. We investigated the genotoxic and apoptotic impact of PFOS in rat liver using comet assay, micronucleus test and apoptotic gene expression methods for caspase 3, caspase 8 and the protective role of curcumin on the PFOS- induced damage under chronic exposure. In this study, rats were treated either with three different PFOS doses only (0...
June 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28634057/evaluation-of-the-biotechnological-potential-of-a-novel-purified-protease-bs1-from-bacillus-safensis-s406-on-the-chitin-extraction-and-detergent-formulation
#11
Samiha Mhamdi, Intidhar Bkhairia, Rim Nasri, Tahar Mechichi, Moncef Nasri, Alya Sellami Kamoun
The aim of this study is the production of High-Added Value enzyme for Industrial Uses. An extracellular alkaline stable protease BS1 was purified from a newly bacterium, Bacillus safensis S406, isolated from the Sfax Solar Saltern. BS1 was purified by a process involving sulfate d'ammonium sulfate precipitation, sephadex G-75, Mono-Q anion-exchange chromatography and ultrafiltation. The enzyme has a molecular weight of 24kDa and appeared as a single band on native-PAGE. The optimum pH and temperature values of its proteolytic activity were pH 11...
June 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28629862/sustained-delivery-of-bsa-hsa-from-biocompatible-plant-cellulose-nanocrystals-for-in-vitro-cholesterol-release-from-endothelial-cells
#12
Rubbel Singla, Sourabh Soni, Yogendra S Padwad, Amitabha Acharya, Sudesh Kumar Yadav
Nanocomposites of plant cellulose nanocrystals (CNCs) were developed by binding model proteins BSA and HSA onto CNCs by physical adsorption and chemical conjugation methods The spectroscopy and microscopy studies confirmed the protein binding onto CNCs. Phosphate buffer saline (pH=4.0, 7.4) and simulated gastric and intestinal fluids (SGF/SIF; pH=1.1/6.5) showed maximum protein release of ∼62% over a period of time. The released proteins were found to retain both structural integrity as well as≥90% of bioactivity...
June 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28629861/flavonoids-determine-the-rate-of-fibrillogenesis-and-structure-of-collagen-type-i-fibrils-in-vitro
#13
Yuri A Kim, Yury S Tarahovsky, Sergei G Gaidin, Elena A Yagolnik, Eugeny N Muzafarov
Collagen fibrils are produced from collagen monomers not only in vivo, but also in vitro. The ability to have an influence on the structure and properties of fibrils may find medical application and can be useful for controlling the formation of collagen gels and sheets in tissue engineering. Here we investigated the influence of flavonoids, distinguished by the number of hydroxyl groups in the B-ring, on the formation of collagen fibrils. A correlation was found between the number of hydroxyl groups, lipophilicity of molecules and their ability to influence the fibril formation...
June 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28629860/hydrogen-deuterium-exchange-kinetics-in-%C3%AE-lactoglobulin-epicatechin-complexes-studied-by-ftir-spectroscopy
#14
Francesca Caporaletti, Marina Carbonaro, Paola Maselli, Alessandro Nucara
Hydrogen-Deuterium exchange kinetics of of β-lactoglobulin and β-lactoglobulin (-)-epicatechin solutions has been investigated through the analysis of the amide I absorption band at 1650cm(-1) in the FTIR spectrum. H-D substitution in NH amides and residues of the protein results in a slight red-shift and in intensity changes of the amide I components: either these effects have been inspected in the framework of the Principal Components Analysis methods. The present analysis allowed to unveil three H-D kinetics at the timescale of the oligomeric fluctuations of the protein...
June 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28629859/s-adenosyl-l-homocysteine-hydrolase-from-a-hyperthermophile-thermotoga-maritima-is-expressed-in-escherichia-coli-in-inactive-form-biochemical-and-structural-studies
#15
Krzysztof Brzezinski, Justyna Czyrko, Joanna Sliwiak, Edyta Nalewajko-Sieliwoniuk, Mariusz Jaskolski, Boguslaw Nocek, Zbigniew Dauter
Thermotoga maritima is a hyperthermophilic bacterium but its genome encodes a number of archaeal proteins including S-adenosyl-L-homocysteine hydrolase (SAHase), which regulates cellular methylation reactions. The question of proper folding and activity of proteins of extremophilic origin is an intriguing problem. When expressed in E.coli and purified (as a homotetramer) at room temperature, the hyperthermophilic SAHase from T.maritima was inactive. ITC study indicated that the protein undergoes heat-induced conformational changes, and enzymatic activity assays demonstrated that these changes are required to attain enzymatic activity...
June 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28629858/preparation-characterization-and-antioxidant-activity-of-silk-peptides-grafted-carboxymethyl-chitosan
#16
Meng Liu, Lian Min, Chen Zhu, Ziqie Rao, Liangling Liu, Wenyan Xu, Pengfeng Luo, Lihong Fan
Free radicals are closely related to the occurrence and development of aging, cancer and inflammation, the ability to scavenge free radicals is an important indicator of the antioxidant activity. In this study, we prepared a water soluble, free radical scavenging and biocompatible copolymer for regenerative therapy. Carboxymethyl chitosan (CMC) was modified with silk peptide (SP) by microbial transglutaminase (MTGase), FT-IR and NMR spectroscopy were used to confirm the successful grafting of SP to CMC. The degree of substitution was determined by ultraviolet spectrophotometry...
June 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28625837/enhanced-corrosion-inhibition-effect-of-chitosan-for-st37-in-15-h2so4-environment-by-silver-nanoparticles
#17
Moses M Solomon, Husnu Gerengi, Tugce Kaya, Saviour A Umoren
The inhibitive performance of chitosan and silver nanoparticles - chitosan (AgNPs-Chi) composite towards St37 steel corrosion in 15% H2SO4 solution was studied using weight loss and electrochemical techniques in addition to surface morphological examination. Results obtained show thatchitosan could fairly protect St37 steel surface by 45%. Inhibition efficiency above 94% has been achieved with AgNPs-Chi composite. AgNPs-Chi composite performs better at longer immersion time and elevated temperature. AgNPs-Chi retards both anodic and cathodic redox reactions...
June 15, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28625836/molecular-interaction-studies-of-acetylcholinesterase-with-potential-acetylcholinesterase-inhibitors-from-the-root-of-rhodiola-crenulata-using-molecular-docking-and-isothermal-titration-calorimetry-methods
#18
Fa-Jie Li, Yuan Liu, Yuan Yuan, Bin Yang, Zhen-Ming Liu, Lu-Qi Huang
(-)-Epicatechin gallate ((-)-ECG), 1,2,3,4,6-O-pentagalloylglucose (PGG), rhodionin, herbacetin and rhodiosin isolated from the root of Rhodiola crenulata exhibited potent, dose-dependent inhibitory effects on acetylcholinesterase (AChE) with IC50 ranged from 57.50±5.83 to 2.43±0.34μg/mL. With the aim of explaining the differences in activity of these active ingredients and clarifying how they inhibit AChE, the AChE-inhibitor interactions were further explored using molecular docking and isothermal titration calorimetry (ITC) methods in the present study...
June 15, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28625835/robust-composite-silk-fibers-pulled-out-of-silkworms-directly-fed-with-nanoparticles
#19
GuoHua Wu, Peng Song, DongYang Zhang, ZeYu Liu, Long Li, HuiMing Huang, HongPing Zhao, NanNan Wang, YanQiu Zhu
This paper reports the impacts of direct feeding silkworms with different nanoparticles (Cu, Fe, and TiO2) on the morphology, structures, and mechanical properties of the resulting silk fiber (SF). The contents of the Cu nanoparticles were 38 times higher in the posterior silk glands and only 2-3 times higher in the SF and in the middle silk glands compared with the controlled groups. Significant changes of the surface morphology, structures, and diameter of the Cu nanoparticle fed SF have been observed, which are attributed to a slight SF protein reconstruction or conformational change in the mixture of silk fibroin and sericin in the silk glands...
June 15, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28624369/controlled-drug-release-through-regulated-biodegradation-of-poly-lactic-acid-using-inorganic-salts
#20
Sunil Kumar, Shikha Singh, Sudipta Senapati, Akhand Pratap Singh, Biswajit Ray, Pralay Maiti
Biodegradation rate of poly(lactic acid) (PLA) has been regulated, both increase and decrease with respect to the biodegradation of pure PLA, by embedding meager amount of inorganic salts in polymer matrix. Biodegradation is performed in enzyme medium on suspension and film and the extent of biodegradation is measured through spectroscopic technique which is also verified by weight loss measurement. Media pH has been controlled using trace amount of inorganic salt which eventually control the biodegradation of PLA...
June 15, 2017: International Journal of Biological Macromolecules
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