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protein hydrolysates

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https://www.readbyqxmd.com/read/27905163/fungal-glycolipid-hydrolase-inhibitors-and-their-effect-on-cryptococcus-neoformans
#1
Andres Gonzalez Santana, Christina Tysoe, Guanggan Hu, James Kronstad, Ethan Goddard-Borger, Stephen Withers
Pathogenic fungi kill an estimated 1.3 million people each year. This number is predicted to rise as drug resistance spreads, thus antifungal drugs with novel modes of action are urgently required. Fungal endoglycoceramidase-related proteins 1 and 2 (EGCrP-1 and -2), which hydrolyse glucosylceramide and ergosteryl beta-glucoside, respectively, are important for fungal cell growth and have been identified as potential targets for drug development. A library of iminosugar derivatives was screened against EGCrP-1 and -2, thereby identifying a number of competitive inhibitors with nanomolar affinities...
November 30, 2016: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/27902281/acidicapsa-acidisoli-sp-nov-from-the-acidic-soil-of-a-deciduous-forest
#2
Heizo Matsuo, Chisaki Kudo, Juan Li, Akio Tonouchi
A bacterial strain designated strain SK-11T was isolated from the acidic soil of a deciduous forest in the Shirakami Mountains in Japan. Cells of strain SK-11T were aerobic, non-motile, Gram-stain-negative rods, 0.7-1.0 µm in width and 1.0-1.4 µm in length. The pH range for growth was between 4.0 and 5.5, with an optimum at 5.0. The temperature range for growth was between 10°C and 35°C, with an optimum at around 25-30°C. Strain SK-11T utilized various carbohydrates as growth substrates as well as yeast extract and protein hydrolysates...
November 23, 2016: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/27898203/biorefining-of-lignocellulosic-feedstock-by-modified-afex-pretreatment-and-enzymatic-hydrolysis-for-production-of-fermentable-sugar
#3
Birgit Kamm
The aim of the work presented in this paper is the examination of the modified AFEX process with aqueous ammonia (25% NH3 w/v) as a simpler variant of the proper AFEX process described in literature. The effects on the glucose conversion rates in the following enzymatic hydrolyses will be examined. Furthermore, the highest possible sugar concentration shall be reached in order to use the gained hydrolysates as a carbon source for fermentation. Moreover, the effect of a protein extraction after the pre-treatment of the biomass on the hydrolysis result will be figured out...
November 29, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27897084/multi-spectroscopic-and-molecular-modeling-studies-of-interaction-between-two-different-angiotensin-i-converting-enzyme-inhibitory-peptides-from-gluten-hydrolysate-and-human-serum-albumin
#4
Reza Assaran Darban, Behzad Shareghi, Ahmad Asoodeh, Jamshidkhan Chamani
The present study was carried out to characterize ACE inhibitory peptides which are release from the trypsin hydrolysate of wheat gluten protein. The binding of two inhibitory peptide (P4 and P6) to human serum albumin (HSA) under physiological conditions has been investigated by multi- spectroscopic in combination with molecular modeling techniques. Time-resolved and quenching fluorescence spectroscopies results revealed that the quenching of HSA fluorescence by P4 and P6 in the binary and ternary systems caused HSA-peptides complexes formation...
November 29, 2016: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/27896020/identification-of-phenolic-secondary-metabolites-from-schotia-brachypetala-sond-fabaceae-and-demonstration-of-their-antioxidant-activities-in-caenorhabditis-elegans
#5
Mansour Sobeh, Esraa ElHawary, Herbenya Peixoto, Rola M Labib, Heba Handoussa, Noha Swilam, Ahmed H El-Khatib, Farukh Sharapov, Tamer Mohamed, Sonja Krstin, Michael W Linscheid, Abdel Nasser Singab, Michael Wink, Nahla Ayoub
BACKGROUND: Schotia brachypetala Sond. (Fabaceae) is an endemic tree of Southern Africa whose phytochemistry and pharmacology were slightly studied. The present work aimed at profiling the major phenolics compounds present in the hydro-alcohol extract from S. brachypetala leaves (SBE) using LC/HRESI/MS/MS and NMR and prove their antioxidant capabilities using novel methods. METHODS: In vitro assays; DPPH, TEAC persulfate decolorizing kinetic and FRAP assays, and in vivo assays: Caenorhabditis elegans strains maintenance, Intracellular ROS in C...
2016: PeerJ
https://www.readbyqxmd.com/read/27893308/evaluation-of-hypotensive-and-antihypertensive-effects-of-velvet-bean-mucuna-pruriens-l-hydrolysates
#6
Luis Chel-Guerrero, Saulo Galicia-Martínez, Juan José Acevedo-Fernández, Jesus Santaolalla-Tapia, David Betancur-Ancona
Hypertension could cause significant worldwide health problems that affect 15-20% of all adults; according to National Health and Nutrition Examination Survey, about 29% of the adult population in the United States are hypertensive. Recent research has shown that peptides derived from the hydrolysis of food proteins can decrease blood pressure. This study was carried out to evaluate the hypotensive and antihypertensive potential of Mucuna pruriens protein hydrolysates in in vitro and in vivo models. M. pruriens protein concentrate was prepared by wet fractionation and enzymatically hydrolyzed using Alcalase(®), Flavourzyme(®), and the sequential system Alcalase-Flavourzyme at different times (5-120 min)...
November 28, 2016: Journal of Medicinal Food
https://www.readbyqxmd.com/read/27888240/topological-organisation-of-the-phosphatidylinositol-4-5-bisphosphate-phospholipase-c-resynthesis-cycle-pitps-bridge-the-er-pm-gap
#7
REVIEW
Shamshad Cockcroft, Padinjat Raghu
Phospholipase C (PLC) is a receptor-regulated enzyme that hydrolyses phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) at the plasma membrane (PM) triggering three biochemical consequences, the generation of soluble inositol 1,4,5-trisphosphate (IP3), membrane-associated diacylglycerol (DG) and the consumption of PM PI(4,5)P2 Each of these three signals triggers multiple molecular processes impacting key cellular properties. The activation of PLC also triggers a sequence of biochemical reactions, collectively referred to as the PI(4,5)P2 cycle that culminates in the resynthesis of this lipid...
December 1, 2016: Biochemical Journal
https://www.readbyqxmd.com/read/27886288/exploring-the-mechanochemical-cycle-of-dynein-motor-proteins-structural-evidence-of-crucial-intermediates
#8
Mandira Dutta, Biman Jana
Dyneins, a class of motor proteins consisting of six AAA+ modules (AAA1-AAA6), convert chemical energy derived from the hydrolysis of ATP into mechanical energy to walk along the microtubule track towards its minus end while accomplishing various cellular tasks including the transportation of various intracellular cargos. In a full mechanochemical cycle, dynein goes through ATP binding induced open to closed state transition of AAA1, hydrolysis of that ATP and closed to open state transition induced by the release of hydrolysed products along with linker remodelling in different nucleotide states...
November 25, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27885680/effect-of-high-hydrostatic-pressure-on-the-enzymatic-hydrolysis-of-bovine-serum-albumin
#9
Serena De Maria, Giovanna Ferrari, Paola Maresca
BACKGROUND: The extent of the enzymatic proteolysis mainly depends on the accessibility of the peptide bonds, which stabilize the protein structure. High Hydrostatic Pressure (HHP) process is able to induce, at certain operating conditions, protein displacement, thus suggesting that this technology can be used to modify protein resistance to the enzymatic attack. This work aims at investigating the mechanism of the enzymatic hydrolysis assisted by HHP performed at different processing conditions (pressure level, treatment time)...
November 24, 2016: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/27885676/effect%C3%A2-of%C3%A2-deamidation-induced%C3%A2-modification%C3%A2-on%C3%A2-umami%C3%A2-and%C3%A2-bitter%C3%A2-taste-of-wheat-gluten%C3%A2-hydrolysates
#10
Bo-Ye Liu, Ke-Xue Zhu, Xiao-Na Guo, Wei Peng, Hui-Ming Zhou
BACKGROUND: Bitter taste is the main limiting factor for various applications of protein hydrolysates. Frequently-used physicochemical methods for debittering protein hydrolysates came with some undesired side effects. Deamidation-induced modification method would be a very promising technique to improve the flavor of wheat gluten hydrolysates (WGHs). This study was designed to determine the effect of deamidation with certain enzymes or acid treatment on the chemical composition, bitterness and umami properties of WGHs...
November 25, 2016: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/27877077/amelioration-of-estrogen-deficiency-induced-obesity-by-collagen-hydrolysate
#11
Tsay-I Chiang, I-Chang Chang, Hsueh-Hui Lee, Kuang Hui Hsieh, Yung-Wei Chiu, Te-Jen Lai, Jer-Yuh Liu, Li-Sung Hsu, Shao-Hsuan Kao
Objectives: Menopausal transition with declining estrogen levels significantly affects the physiological properties of women and consequently contributes to a series of medical conditions, including obesity. Obesity is a crucial risk factor associated with cardiovascular diseases, diabetes mellitus, and breast cancer. Increasing dietary protein content improves satiety and energy expenditure. Thus, we hypothesize that supplementing with collagen, a common dietary protein, may alleviate menopause-induced obesity...
2016: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/27872187/galactomannan-catabolism-conferred-by-a-polysaccharide-utilisation-locus-of-bacteroides-ovatus-enzyme-synergy-and-crystal-structure-of-a-%C3%AE-mannanase
#12
Viktoria Bågenholm, Sumitha K Reddy, Hanene Bouraoui, Johan Morrill, Evelina Kulcinskaja, Constance M Bahr, Oskar Aurelius, Theresa Rogers, Yao Xiao, Derek T Logan, Eric C Martens, Nicole M Koropatkin, Henrik Stålbrand
A recently identified polysaccharide utilisation locus (PUL) from Bacteroides ovatus ATCC8483 is transcriptionally upregulated during growth on galacto- and glucomannans. It encodes two putative glycoside hydrolase family 26 (GH26) β-mannanases, BoMan26A and BoMan26B, and a GH36 α-galactosidase, BoGal36A. The PUL also includes two glycan binding proteins, confirmed by β-mannan affinity electrophoresis. When this PUL was deleted, B. ovatus was no longer able to grow on locust bean galactomannan. BoMan26A primarily formed mannobiose from mannan polysaccharides...
November 21, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27868064/shrimp-protein-hydrolysate-modulates-the-timing-of-proinflammatory-macrophages-in-bupivacaine-injured-skeletal-muscles-in-rats
#13
Junio Dort, Nadine Leblanc, Piotr Bryl, Marie-Gil Fortin, Marie-Elise Carbonneau, Charles Lavigne, Hélène Jacques
This study was designed to determine whether marine-derived proteins other than cod could have beneficial effects on inflammation following muscle injury. Macrophage and neutrophil densities were measured from bupivacaine-injured tibialis anterior muscle of rats fed isoenergetic diets containing either shrimp hydrolysate (Shr), casein hydrolysate (CaH), or whole casein (Ca). In this study, Shr reduced ED(1+)-macrophages at day 2 (p = 0.013), day 5 (p = 0.006), and day 14 after injury (p = 0.038) compared with Ca, indicating faster resolution of inflammation in Shr...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27866295/characterization-of-a-neutral-recombinant-xylanase-from-thermoactinospora-rubra-yim-77501-t
#14
Yi-Rui Yin, Qing-Wen Hu, Wen-Dong Xian, Feng Zhang, En-Min Zhou, Hong Ming, Min Xiao, Xiao-Yang Zhi, Wen-Jun Li
A xylanase gene (TrXyn10) from Thermoactinospora rubra YIM 77501(T) was cloned and expressed in Escherichia coli. The amino acid sequence displayed 78% homology with Microbispora mesophila xylanase (WP_062413927.1). The recombinant xylanase (TrXyn10), with MW 46.1 kDa, could hydrolyse beechwood, birchwood and oatspelt xylan. Based on the sequence, enzymatic properties and tertiary structure of the protein, TrXyn10 belongs to glycoside hydrolase family 10 (GH10). The optimal pH and temperature for the recombinant enzyme were determined to be 7...
November 19, 2016: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/27858796/influence-of-hydraulic-retention-time-on-the-psychrophilic-hydrolysis-acidogenesis-of-proteins
#15
Paola Poirrier, María Cristina Schiappacasse, Marta Carballa, Juan M Lema
The influence of the hydraulic retention time (HRT) on the anaerobic hydrolysis of complex substrates has been studied under psychrophilic conditions. For this purpose, a continuous stirred tank reactor was operated at 15 °C and neutral pH and gelatin was considered as a model protein. Three HRTs have been tested: 12, 21 and 36 h. Gelatin hydrolysis was greatly dependent on HRT, increasing from 40% at 12 h-HRT to a maximum of 65% at 36 h-HRT. Molecular size distribution analyses of the effluent showed that hydrolysation of compounds larger than 10 kDa was poor at 12 h-HRT, whereas the fraction of 1-10 kDa was completely transformed into compounds smaller than 1 kDa...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27855889/bioavailability-of-angiotensin-i-converting-enzyme-ace-inhibitory-peptides-derived-from-virgibacillus-halodenitrificans-sk1-3-7-proteinases-hydrolyzed-tilapia-muscle-proteins
#16
Tidarat Toopcham, Jurriaan J Mes, Harry J Wichers, Sittiruk Roytrakul, Jirawat Yongsawatdigul
The angiotensin I-converting enzyme (ACE) inhibitory activity of protein hydrolysates from tilapia muscle fractions, namely mince (M), washed mince (WM), and sarcoplasmic protein (SP), were investigated. Each fraction was hydrolyzed by Virgibacillus halodenitrificans SK1-3-7 proteinases for up to 24h. After 8h of hydrolysis, the M hydrolysate (48% degree of hydrolysis (DH)) showed the highest ACE inhibitory activity, with an IC50 value of 0.54mg/ml, while the SP hydrolysate exhibited the lowest DH and ACE inhibition...
April 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27855606/european-carp-cyprinus-carpio-l-protein-derived-ex-vivo-digests-and-in-vitro-hydrolysates-differ-in-the-ace-i-inhibitory-activity-and-composition-of-released-ace-inhibitory-peptides
#17
Małgorzata Darewicz, Justyna Borawska-Dziadkiewicz, Gerd E Vegarud, Piotr Minkiewicz
Carp muscle tissue is a valuable source of biologically active constituents known to positively influence human health. In this study, carp protein digests/hydrolysates generated by human/porcine digestive enzymes were analysed for their angiotensin I-converting enzyme inhibitory (ACEi) activity. The ex vivo digests and in vitro hydrolysates were used in a screening for ACEi peptides as well. Carp proteins were hydrolysed more rapidly by human gastrointestinal juices than by porcine enzymes. Sarcoplasmic protein fractions were digested/hydrolysed more facile than the myofibrillar ones...
November 17, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27834834/the-cooperative-effect-of-genistein-and-protein-hydrolysates-on-the-proliferation-and-survival-of-osteoblastic-cells-hfob-1-19
#18
Shuo Wang, Yu Fu, Xin-Huai Zhao
Chum salmon skin gelatin, de-isoflavoned soy protein, and casein were hydrolyzed at two degrees of hydrolysis. Genistein, the prepared hydrolysates, and genistein-hydrolysate combinations were assessed for their proliferative and anti-apoptotic effects on human osteoblasts (hFOB 1.19) to clarify potential cooperative effects between genistein and these hydrolysates in these two activities. Genistein at 2.5 μg/L demonstrated the highest proliferative activity, while the higher dose of genistein inhibited cell growth...
November 8, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27833946/in-vitro-digestion-of-infant-formulations-with-hydrolysed-and-non-hydrolysed-proteins-from-dairy-and-soybean
#19
Thao T P Nguyen, Bhesh Bhandari, Julie Cichero, Sangeeta Prakash
Digestion of hydrolysed and non-hydrolysed dairy (casein and whey proteins) and soy proteins commonly used in infant formulations was studied under in vitro gastrointestinal (without lipases) conditions for 60 and 120 minutes in the stomach and small intestine, respectively. The pH-drop, gel electrophoresis, microstructure, particle size distribution, and ninhydrin-reactive amino nitrogen of the digesta were monitored over the digestion period. The obtained results suggested that hydrolysed proteins were completely digested in the small intestine, while non-hydrolysed proteins (caseins, α-lactalbumin, β-lactoglobulin, conglycinin, glycinin) were only partially digested in the simulated gastrointestinal tract...
November 11, 2016: Food & Function
https://www.readbyqxmd.com/read/27826437/protein-hydrolysates-produced-from-rock-lobster-jasus-edwardsii-head-emulsifying-capacity-and-food-safety
#20
Shan He, Trung T Nguyen, Peng Su, Wei Zhang
Lobster protein hydrolysates (LPH) were produced by an enzymatic process using a proteinase Alcalase, and a chemical process at strong alkaline condition (pH of 14), from rock lobster head (RLH), respectively. The chemical process recovered about 30% more protein than the enzymatic process (84.9% recovery of total protein in RLH by the chemical process and 54.5% recovery of total protein in RLH by the enzymatic process). The emulsifying capacity of LPH produced by the chemical process (69.7 m(2)/g) was significantly higher than the emulsifying capacity of the LPH produced by the enzymatic process (20...
November 2016: Food Science & Nutrition
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