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https://www.readbyqxmd.com/read/28103438/acylguanidine-beta-secretase-1-inhibitors-a-combined-experimental-and-free-energy-perturbation-study
#1
Henrik Keränen, Laura Pérez-Benito, Myriam Ciordia, Francisca Delgado, Thomas B Steinbrecher, Daniel Oehlrich, Herman W T Van Vlijmen, Andrés A Trabanco, Gary Tresadern
A series of acylguanidine beta secretase 1 (BACE1) inhibitors with modified scaffold and P3 pocket substituent was synthesized and studied with Free Energy Perturbation (FEP) calculations. The resulting molecules showed potencies in enzymatic BACE1 inhibition assays up to 1 nM. The correlation between the predicted activity from the FEP calculations and the experimental activity was good for the P3 pocket substituents. The average mean unsigned error (MUE) between prediction and experiment was 0.68 ± 0.17 kcal/mol for the default 5 ns lambda window simulation time improving to 0...
January 19, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28103393/the-correlation-between-in-vitro-antioxidant-activity-and-immunomodulatory-activity-of-enzymatic-hydrolysates-from-selenium-enriched-rice-protein
#2
Yong Fang, Xi Chen, Peizhu Luo, Fei Pei, Benard Muinde Kimatu, Kunlun Liu, Mengjia Du, Weifen Qiu, Qiuhui Hu
The antioxidant and immunomodulatory activities of selenium-enriched rice protein hydrolysates (Se-PH) were evaluated by a cellular antioxidant activity test and macrophage proliferation and phagocytosis assays, respectively. The results showed that trypsin hydrolysate provided the highest proliferation rate of 60.91% at a concentration of 100 μg/mL. Moreover, a remarkable rise in the phagocytosis rates for trypsin hydrolysate (64.1%) and pepsin-trypsin hydrolysate (54.5%) was observed when the sample concentrations were increased to 50 μg/mL...
January 19, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28103306/a-superoxide-dismutase-capable-of-functioning-with-iron-or-manganese-promotes-the-resistance-of-staphylococcus-aureus-to-calprotectin-and-nutritional-immunity
#3
Yuritzi M Garcia, Anna Barwinska-Sendra, Emma Tarrant, Eric P Skaar, Kevin J Waldron, Thomas E Kehl-Fie
Staphylococcus aureus is a devastating mammalian pathogen for which the development of new therapeutic approaches is urgently needed due to the prevalence of antibiotic resistance. During infection pathogens must overcome the dual threats of host-imposed manganese starvation, termed nutritional immunity, and the oxidative burst of immune cells. These defenses function synergistically, as host-imposed manganese starvation reduces activity of the manganese-dependent enzyme superoxide dismutase (SOD). S. aureus expresses two SODs, denoted SodA and SodM...
January 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28102686/one-pot-enzymatic-total-synthesis-of-presteffimycinone-an-early-intermediate-of-the-anthracycline-antibiotic-steffimycin-biosynthesis
#4
Guojun Wang, Jing Chen, Haining Zhu, Jürgen Rohr
Early acting cyclases play critical roles in programming the polyketide biosynthesis toward certain, distinguished scaffolds. Starting from acetyl-CoA and malonyl-CoA, a one-pot enzymatic total synthesis of an anthracyclinone scaffold, presteffimycinone, was achieved by mixing polyketide synthase (PKS) and early post-PKS enzymes from the biosynthetic pathways of three different types of type II-PKS driven anticancer antibiotics, namely, the mithramycin (aureolic acid-type), gilvocarcin (rearranged angucycline-type), and steffimycin (anthracycline) pathways...
January 19, 2017: Organic Letters
https://www.readbyqxmd.com/read/28102511/some-nutritional-characteristics-of-enzymatically-resistant-maltodextrin-from-cassava-manihot-esculenta-crantz-starch
#5
Rocío Toraya-Avilés, Maira Segura-Campos, Luis Chel-Guerrero, David Betancur-Ancona
Cassava (Manihot esculenta Crantz) native starch was treated with pyroconversion and enzymatic hydrolysis to produce a pyrodextrin and an enzyme-resistant maltodextrin. Some nutritional characteristics were quantified for both compounds. Pyroconversion was done using a 160:1 (p/v) starch:HCl ratio, 90 °C temperature and 3 h reaction time. The resulting pyrodextrin contained 46.21% indigestible starch and 78.86% dietary fiber. Thermostable α-amylase (0.01%) was used to hydrolyze the pyrodextrin at 95 °C for 5 min...
January 19, 2017: Plant Foods for Human Nutrition
https://www.readbyqxmd.com/read/28101961/antibody-formation-towards-porcine-tissue-in-patients-implanted-with-crosslinked-heart-valves-is-directed-to-antigenic-tissue-proteins-and-%C3%AE-gal-epitopes-and-is-reduced-in-healthy-vegetarian-subjects
#6
Ulrike Böer, Falk F R Buettner, Ariane Schridde, Melanie Klingenberg, Samir Sarikouch, Axel Haverich, Mathias Wilhelmi
BACKGROUND: Glutaraldehyde-fixed porcine heart valves (ga-pV) are one of the most frequently used substitutes for insufficient aortic and pulmonary heart valves which, however, degenerate after 10-15 years. Yet, xeno-immunogenicity of ga-pV in humans including identification of immunogens still needs to be investigated. We here determined the immunogenicity of ga-pV in patients with respect to antibody formation, identity of immunogens and potential options to reduce antibody levels. METHODS: Levels of tissue-specific and anti-αGal antibodies were determined retrospectively in patients who received ga-pV for 51 months (n=4), 25 months (n=6) or 5 months (n=4) and compared to age-matched untreated subjects (n=10) or younger subjects with or without vegetarian diet (n=12/15)...
January 18, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/28101822/lupinus-albus-conglutin-gamma-modifies-the-gene-expressions-of-enzymes-involved-in-glucose-hepatic-production-in-vivo
#7
Ana E González-Santiago, Belinda Vargas-Guerrero, Pedro M García-López, Alma L Martínez-Ayala, José A Domínguez-Rosales, Carmen M Gurrola-Díaz
Lupinus albus seeds contain conglutin gamma (Cγ) protein, which exerts a hypoglycemic effect and positively modifies proteins involved in glucose homeostasis. Cγ could potentially be used to manage patients with impaired glucose metabolism, but there remains a need to evaluate its effects on hepatic glucose production. The present study aimed to analyze G6pc, Fbp1, and Pck1 gene expressions in two experimental animal models of impaired glucose metabolism. We also evaluated hepatic and renal tissue integrity following Cγ treatment...
January 18, 2017: Plant Foods for Human Nutrition
https://www.readbyqxmd.com/read/28101778/eight-novel-mut-loss-of-function-missense-mutations-in-chinese-patients-with-isolated-methylmalonic-academia
#8
Lian-Shu Han, Zhuo Huang, Feng Han, Yu Wang, Zhu-Wen Gong, Xue-Fan Gu
BACKGROUND: Isolated methylmalonic acidemia is a rare autosomal recessive metabolic disorder mostly caused by mutations in the methylmalonyl coenzyme A mutase (MCM) gene (MUT). This study aimed to verify whether missense mutations in MUT in Chinese patients affect the stability and enzymatic activity of MCM. METHODS: Eight Chinese patients were identified with novel mutations. Plasmids carrying the wild-type and mutated MUT cDNA were constructed and transfected into HEK293T cells for functional analyses...
January 19, 2017: World Journal of Pediatrics: WJP
https://www.readbyqxmd.com/read/28101252/identification-of-proteins-from-wild-cardoon-flowers-cynara-cardunculus-l-by-a-proteomic-approach
#9
Amal Ben Amira, Julien Bauwens, Edwin De Pauw, Souhail Besbes, Hamadi Attia, Frédéric Francis, Christophe Blecker
Proteomic approach was applied to identify total proteins, particularly the enzymatic content, from wild cardoon flowers. As the selection of an appropriate sample preparation method is the key for getting reliable results, two different extraction/precipitation methods (trichloroacetic acid and phenol/ammonium acetate) were tested on fresh and lyophilized flowers. After two-dimensional electrophoresis (2D-E) separations, a better protein pattern was obtained after phenol extraction from lyophilized flowers...
January 2017: Journal of Chemical Biology
https://www.readbyqxmd.com/read/28101223/modulatory-effect-of-luteolin-on-redox-homeostasis-and-inflammatory-cytokines-in-a-mouse-model-of-liver-cancer
#10
Qiang Zhang, Jie Yang, Jun Wang
Liver cancer is one of the leading causes of cancer-associated mortality worldwide. Due to changes in lifestyle and daily exposure to various chemicals, which may lead to chemical intoxication, liver cancer has become a prominent disease in humans. Chemical-induced carcinogenesis in experimental animals has become a reliable model for the investigation of liver cancer-associated biological alterations that may mimic human hepatic cancer. Liver cancer in BALB/c mice was induced by administering diethylnitrosamine (DN) in drinking water for 6 weeks...
December 2016: Oncology Letters
https://www.readbyqxmd.com/read/28101142/exploring-accessibility-of-pretreated-poplar-cell-walls-by-measuring-dynamics-of-fluorescent-probes
#11
Gabriel Paës, Anouck Habrant, Jordane Ossemond, Brigitte Chabbert
BACKGROUND: The lignocellulosic cell wall network is resistant to enzymatic degradation due to the complex chemical and structural features. Pretreatments are thus commonly used to overcome natural recalcitrance of lignocellulose. Characterization of their impact on architecture requires combinatory approaches. However, the accessibility of the lignocellulosic cell walls still needs further insights to provide relevant information. RESULTS: Poplar specimens were pretreated using different conditions...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28100887/production-of-a-health-beneficial-food-emulsifier-by-enzymatic-partial-hydrolysis-of-phospholipids-obtained-from-the-head-of-autumn-chum-salmon
#12
A K M Azad Shah, Toshihiro Nagao, Hideyuki Kurihara, Koretaro Takahashi
Phospholipids and their partial hydrolysates, namely lysophospholipids (LPLs), have been widely used in food, pharmaceutical, and cosmetic products as highly efficient emulsifiers. This study was conducted to produce docosahexaenoic acid (DHA)-esterified LPLs by enzymatic modification of phospholipids obtained from the head of autumn chum salmon (Oncorhynchus keta). The emulsifying properties of the obtained LPLs were also evaluated. Two different types of substrates of salmon head phospholipids were prepared via silica gel and cold acetone precipitation...
January 18, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28100852/allergenicity-of-milk-of-different-animal-species-in-relation-to-human-milk
#13
Robert Pastuszka, Joanna Barłowska, Zygmunt Litwińczuk
Protein content in cow milk (with over 20 proteins, and peptides may also occur as a result of enzymatic hydrolysis) ranges from 2.5% to 4.2% and is about 1.5-2 times higher than in human milk. Its most important allergens are considered to be β-lactoglobulin (absent in human milk) and αs1-casein. The most similar in composition to human milk is horse and donkey milk. It contains considerably more whey proteins (35-50%) than cow milk (about 20%), and the concentration of the most allergenic casein fraction αs1 is 1...
December 31, 2016: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/28100787/polymorphic-variants-of-human-protein-l-isoaspartyl-methyltransferase-affect-catalytic-activity-aggregation-and-thermal-stability-implications-for-the-etiology-of-neurological-disorders-and-cognitive-aging
#14
Charity Juang, Baihe Chen, Jean-Louis Bru, Katherine Nguyen, Eric Huynh, Mahsa Momen, Jeungjin Kim, Dana W Aswad
Protein L-isoaspartyl methyltransferase (PIMT/PCMT1), a product of the human pcmt1 gene, catalyzes repair of abnormal L-isoaspartyl linkages in age-damaged proteins. Pcmt1 knockout mice exhibit a profound neuropathology and die 30-60 days postnatal from an epileptic seizure. Here we express 15 reported variants of human PIMT and characterize them with regard to their enzymatic activity, thermal stability, and propensity to aggregation. One mutation, R36C, renders PIMT completely inactive, while two others, A7P and I58V, exhibit activity that is 80-100% higher than wild type...
January 18, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28100770/control-of-amino-acid-homeostasis-by-a-ubiquitin-ligase-coactivator-protein-complex
#15
Damian Guerra, Sonia M Chapiro, Réjane Pratelli, Shi Yu, Weitao Jia, Julie Leary, Guillaume Pilot, Judy Callis
Intercellular amino acid transport is essential for the growth of all multicellular organisms, and its dysregulation is implicated in developmental disorders. By an unknown mechanism, amino acid efflux is stimulated in plants by over-expression of a membrane-localized protein (GLUTAMINE DUMPER 1, GDU1) that requires a ubiquitin ligase (LOSS OF GDU 2, LOG2). Here we further explore the physiological consequences of the interaction between these two proteins. LOG2 ubiquitin ligase activity is necessary for GDU1-dependent tolerance to exogenous amino acids, and LOG2 self-ubiquitination was markedly stimulated by the GDU1 cytosolic domain, suggesting that GDU1 functions as an adaptor or coactivator of amino acid exporter(s)...
January 18, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28100651/stabilization-of-bacillus-circulans-xylanase-by-combinatorial-insertional-fusion-to-a-thermophilic-host-protein
#16
Vandan Shah, Brennal Pierre, Tamari Kirtadze, Seung Shin, Jin Ryoun Kim
High thermostability of an enzyme is critical for its industrial application. While many engineering approaches such as mutagenesis have enhanced enzyme thermostability, they often suffer from reduced enzymatic activity. A thermally stabilized enzyme with unchanged amino acids is preferable for subsequent functional evolution necessary to address other important industrial needs. In the research presented here, we applied insertional fusion to a thermophilic maltodextrin-binding protein from Pyrococcus furiosus (PfMBP) in order to improve the thermal stability of Bacillus circulans xylanase (BCX)...
January 17, 2017: Protein Engineering, Design & Selection: PEDS
https://www.readbyqxmd.com/read/28100623/temperature-sensitive-lesion-in-the-n-terminal-domain-of-the-rotavirus-polymerase-affects-its-intracellular-localization-and-enzymatic-activity
#17
Allison O McKell, Leslie E W LaConte, Sarah M McDonald
: Temperature-sensitive (ts) mutants of simian rotavirus (RV) strain SA11 have been previously created to investigate the functions of viral proteins during replication. One mutant, SA11-tsC, maps to the gene encoding the VP1 polymerase and shows diminished growth and RNA synthesis at 39°C as compared to 31°C. In the current study, we sequenced all 11 genes of SA11-tsC, confirming the presence of an L138P mutation in the VP1 N-terminal domain and identifying 52 additional mutations in four other viral proteins (VP7, VP4, NSP2, and NSP1)...
January 18, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28100224/radical-scavenging-activities-of-lagerstroemia-speciosa-l-pers-petal-extracts-and-its-hepato-protection-in-ccl4-intoxicated-mice
#18
Bipransh Kumar Tiwary, Somit Dutta, Priyankar Dey, Mossaraf Hossain, Anoop Kumar, Sony Bihani, Ashis Kumar Nanda, Tapas Kumar Chaudhuri, Ranadhir Chakraborty
BACKGROUND: Lagerstroemia speciosa (L.) Pers. has medicinal importance. Bioactive phytochemicals isolated from different parts of L. speciosa, have revealed hypoglycemic, antibacterial, anti-inflammatory, antioxidant and hepato protective properties. Despite one report from Philippines detailing the use of L. speciosa as curative for fever and as well as diuretic, there is no experimental evidence about the hepatoprotective activity of the flower extracts. METHODS: Several spectroscopic methods, including GC-MS, were used to characterize phytochemicals present in the petal extract of L...
January 18, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28100113/characterization-and-production-of-multifunctional-cationic-peptides-derived-from-rice-proteins
#19
Masayuki Taniguchi, Akihito Ochiai
Food proteins have been identified as a source of bioactive peptides. These peptides are inactive within the sequence of the parent protein and must be released during gastrointestinal digestion, fermentation, or food processing. Of bioactive peptides, multifunctional cationic peptides are more useful than other peptides that have specific activity in promotion of health and/or the treatment of diseases. We have identified and characterized cationic peptides from rice enzymes and proteins that possess multiple functions, including antimicrobial, endotoxin-neutralizing, arginine gingipain-inhibitory, and/or angiogenic activities...
January 19, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28100077/effects-of-m2000-d-mannuronic-acid-on-learning-memory-retrieval-and-associated-determinants-in-a-rat-model-of-alzheimer-s-disease
#20
Somayeh Athari Nik Azm, Mohammadreza Vafa, Mohammad Sharifzadeh, Majid Safa, Anis Barati, Abbas Mirshafiey
The d-mannuronic acid (M2000) is a novel nonsteroidal anti-inflammatory drug that has immunosuppressive effects together with antioxidant property. M2000 has shown a notable efficacy in experimental models of multiple sclerosis, rheumatoid arthritis, and nephrotic syndrome. In this work, the effect of M2000 on the treatment of Alzheimer's disease (AD) was performed by Morris water maze experiment, and the immunological assessments were carried out by Western blot, apoptosis (procaspase-3, Bax/Bcl2, P53), enzymatic (superoxide dismutase [SOD]), and nonenzymatic oxidative stress (malondialdehyde [MDA]) tests...
February 2017: American Journal of Alzheimer's Disease and Other Dementias
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