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https://www.readbyqxmd.com/read/28212329/enzyme-assisted-discovery-of-antioxidant-peptides-from-edible-marine-invertebrates-a-review
#1
REVIEW
Tsun-Thai Chai, Yew-Chye Law, Fai-Chu Wong, Se-Kwon Kim
Marine invertebrates, such as oysters, mussels, clams, scallop, jellyfishes, squids, prawns, sea cucumbers and sea squirts, are consumed as foods. These edible marine invertebrates are sources of potent bioactive peptides. The last two decades have seen a surge of interest in the discovery of antioxidant peptides from edible marine invertebrates. Enzymatic hydrolysis is an efficient strategy commonly used for releasing antioxidant peptides from food proteins. A growing number of antioxidant peptide sequences have been identified from the enzymatic hydrolysates of edible marine invertebrates...
February 16, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28197324/-125-i-f56-peptide-as-radioanalysis-agent-targeting-vegfr1-in-mice-xenografted-with-human-gastric-tumor
#2
Hua Zhu, Chuanke Zhao, Fei Liu, Lixin Wang, Junnan Feng, Chengchao Shou, Zhi Yang
(125)I-Radiolabeled F56 peptide was designed as a radioactive analogue of F56 (peptide WHSDMEWWYLLG) to bind with VEGFR1 receptor. It was synthesized in high radiochemical yield and specific activity. The in vitro stability of (125)I-F56 was tested, and the bioactivity of (125)I-F56 was confirmed by both cell uptake and binding affinity measurement in VEGFR1 positive BGC-823 cells. The time-radioactivity relationship and biodistribution of (125)I-F56 tracer were conducted using nude mice bearing human gastric carcinoma BGC-823, by noninvasive micro-SPECT/CT imaging...
February 9, 2017: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28195491/prodrug-like-pegylated-protein-toxin-trichosanthin-for-reversal-of-chemoresistance
#3
Yingzhi Chen, Meng Zhang, Hongyue Jin, Yisi Tang, Aihua Wu, Qin Xu, Yongzhuo Huang
Multidrug resistance (MDR) is a main obstacle in cancer chemotherapy. The MDR mechanisms involve P-glycoprotein (P-gp) overexpression, abnormality of apoptosis-related protein, and altered expression of drug-targeting proteins. Therapeutic proteins are emerging as candidates for overcoming cancer MDR because of not only their large molecular size that potentially circumvents the P-gp-mediated drug efflux but also their distinctive bioactivity distinguished from small-molecular drugs. Herein we report trichosanthin, a plant protein toxin, possesses synergistic effect with paclitaxel (PTX) in the PTX-resistance A549/T nonsmall cell lung cancer (NSCLC) cells, by reversing PTX-caused caspase 9 phosphorylation and inducing caspase 3-dependent apoptosis...
February 14, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28195465/identification-and-relative-quantification-of-bioactive-peptides-sequentially-released-during-simulated-gastrointestinal-digestion-of-commercial-kefir
#4
Yufang Liu, Monika Pischetsrieder
Health-promoting effects of kefir may be partially caused by bioactive peptides. To evaluate their formation or degradation during gastrointestinal digestion, we monitored changes of the peptide profile in a model of oral (1), gastric (2) and small intestinal (3) digestion of kefir. MALDI-TOF-MS analyses revealed clearly different profiles between digests 2/3 and kefir/digest 1. Subsequent UPLC-ESI-MS/MS identified 92 peptides in total (25, 25, 43, and 30, partly overlapping in kefir and digests 1, 2, and 3, respectively), including 16 peptides with ascribed bioactivity...
February 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28192654/self-assembly-of-recombinant-silk-as-a-strategy-for-chemical-free-formation-of-bioactive-coatings-a-real-time-study
#5
Linnea Nilebäck, Jesper Niels Hedin, Mona Widhe, Lotta S Floderus, Annika Krona, Helena Bysell, My Hedhammar
Functionalization of biomaterials with biologically active peptides can improve their performance after implantation. By genetic fusion to self-assembling proteins, the functional peptides can easily be presented on different physical formats. Herein, a chemical-free coating method based on self-assembly of the recombinant spider silk protein 4RepCT is described and used to prepare functional coatings on various biomaterial surfaces. The silk assembly on surfaces was studied in real-time, revealing occurrence of continuous assembly of silk proteins onto surfaces and formation of nanofibrillar structures...
February 13, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28191928/self-assembling-multidomain-peptide-nanofibers-for-delivery-of-bioactive-molecules-and-tissue-regeneration
#6
Amanda N Moore, Jeffrey D Hartgerink
Multidomain peptides (MDPs) are a class of self-assembling peptides that are organized in a β-sheet motif, resulting in a nanofibrous architecture. This structure is stabilized by hydrophobic packing in the fiber core and a hydrogen-bonding network down the fiber long axis. Under easily controllable conditions, regulated by electrostatic interactions between the peptides and the pH and salt composition of the solvent, the nanofiber length can be dramatically extended, resulting in fiber entanglement and hydrogel formation...
February 13, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28181620/effect-of-flexible-linker-length-on-the-activity-of-fusion-protein-4-coumaroyl-coa-ligase-stilbene-synthase
#7
Huili Guo, Yadong Yang, Feiyan Xue, Hong Zhang, Tiran Huang, Wenbin Liu, Huan Liu, Fenqiang Zhang, Mingfeng Yang, Chunmei Liu, Heshu Lu, Yansheng Zhang, Lanqing Ma
In order to elucidate the effect of flexible linker length on the catalytic efficiency of fusion proteins, two short flexible peptide linkers of various lengths were fused between Arabidopsis thaliana 4-coumaroyl-CoA ligase (4CL) and Polygonum cuspidatum stilbene synthase (STS) to generate fusion proteins 4CL-(GSG)n-STS (n ≤ 5) and 4CL-(GGGGS)n-STS (n ≤ 4). The fusion proteins were expressed in both Escherichia coli and Saccharomyces cerevisiae, and their bioactivities were tested in vitro and in vivo using purified proteins and engineered strains, respectively...
February 9, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28180064/dipeptidyl-peptidase-4-inhibitor-treatment-induces-a-greater-increase-in-plasma-levels-of-bioactive-gip-than-glp-1-in-non-diabetic-subjects
#8
Tsuyoshi Yanagimachi, Yukihiro Fujita, Yasutaka Takeda, Jun Honjo, Hidemitsu Sakagami, Hiroya Kitsunai, Yumi Takiyama, Atsuko Abiko, Yuichi Makino, Timothy J Kieffer, Masakazu Haneda
OBJECTIVE: Glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) possess multiple bioactive isoforms that are rendered non-insulinotropic by the enzyme dipeptidyl peptidase-4 (DPP-4). Recently, some ELISA kits have been developed to specifically measure "active" GIP and GLP-1, but it is unclear if these kits can accurately quantify all bioactive forms. Therefore, it remains uncertain to what extent treatment with a DPP-4 inhibitor boosts levels of biologically active GIP and GLP-1...
February 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/28179900/production-of-potent-antimicrobial-compounds-from-streptomyces-cyaneofuscatus-associated-with-fresh-water-sediment
#9
Zothanpuia, Ajit K Passari, Preeti Chandra, Vincent V Leo, Vineet K Mishra, Brijesh Kumar, Bhim P Singh
The genus Streptomyces under phylum actinobacteria has been recognized as a prolific source for the production of bioactive secondary metabolites. An actinobacterial strain designated as DST103 isolated from a wetland fresh water sediment of Tamdil Lake, Mizoram, Northeast, India was identified as Streptomyces cyaneofuscatus (KY287599) using 16SrRNA gene sequencing which shares 99.87% sequence similarity with Streptomyces cyaneofuscatus NRRL B-2570 (T) . The strain showed broad spectrum antimicrobial activities against Gram negative bacteria (Escherichia coli MTCC 739 and Pseudomonas aeruginosa MTCC 2453), Gram positive bacteria (Micrococcus luteus NCIM 2170 and Staphylococcus aureus MTCC 96) and yeast pathogen Candida albicans MTCC 3017)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28179545/a-sterilizable-biocompatible-tropoelastin-surface-coating-immobilized-by-energetic-ion-activation
#10
Giselle C Yeo, Alexey Kondyurin, Elena Kosobrodova, Anthony S Weiss, Marcela M M Bilek
Biomimetic materials which integrate with surrounding tissues and regulate new tissue formation are attractive for tissue engineering and regenerative medicine. Plasma immersion ion-implanted (PIII) polyethersulfone (PES) provides an excellent platform for the irreversible immobilization of bioactive proteins and peptides. PIII treatment significantly improves PES wettability and results in the formation of acidic groups on the PES surface, with the highest concentration observed at 40-80 s of PIII treatment...
February 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28177710/improvement-of-activity-related-knee-joint-discomfort-following-supplementation-of-specific-collagen-peptides
#11
Denise Zdzieblik, Steffen Oesser, Albert Gollhofer, Daniel Koenig
The aim of the study was to evaluate the use of specific collagen peptides in reducing pain in athletes with functional knee problems during sport. 139 athletic subjects with functional knee pain ingested 5 g of bioactive collagen peptides (BCP) or a placebo per day for 12 weeks. The primary outcome of the study was a change in pain intensity during activity was evaluated by the participants and the attending physicians using a visual analogue scale (VAS). As secondary endpoints, pain intensity under resting conditions, the range of motion (ROM) of the knee joint, and the use of additional therapeutic options were assessed...
January 24, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28170182/primary-salivary-human-stem-progenitor-cells-undergo-microenvironment-driven-acinar-like-differentiation-in-hyaluronate-hydrogel-culture
#12
Padma Pradeepa Srinivasan, Vaishali N Patel, Shuang Liu, Daniel A Harrington, Matthew P Hoffman, Xinqiao Jia, Robert L Witt, Mary C Farach-Carson, Swati Pradhan-Bhatt
Radiotherapy for head and neck cancer often has undesirable effects on salivary glands that lead to xerostomia or severe dry mouth, which can increase oral infections. Our goal is to engineer functional, three-dimensional (3D) salivary gland neotissue for autologous implantation to provide permanent relief. An immediate need exists to obtain autologous adult progenitor cells as the use of embryonic and induced pluripotent stem cells potentially pose serious risks such as teratogenicity and immunogenic rejection...
January 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28165456/cryptic-bioactivity-capacitated-by-synthetic-hybrid-plant-peptides
#13
Yuki Hirakawa, Hidefumi Shinohara, Kai Welke, Stephan Irle, Yoshikatsu Matsubayashi, Keiko U Torii, Naoyuki Uchida
Evolution often diversifies a peptide hormone family into multiple subfamilies, which exert distinct activities by exclusive interaction with specific receptors. Here we show that systematic swapping of pre-existing variation in a subfamily of plant CLE peptide hormones leads to a synthetic bifunctional peptide that exerts activities beyond the original subfamily by interacting with multiple receptors. This approach provides new insights into the complexity and specificity of peptide signalling.
February 6, 2017: Nature Communications
https://www.readbyqxmd.com/read/28164794/genomic-and-metabolic-traits-endow-bacillus-velezensis-cc09-with-a-potential-biocontrol-agent-in-control-of-wheat-powdery-mildew-disease
#14
Xun-Chao Cai, Chang-Hong Liu, Bao-Tong Wang, Ya-Rong Xue
Bacillus velezensis CC09, which was isolated from healthy leaves of Cinnamomum camphora and previously identified as Bacillus amyloliquefaciens CC09, shows great potential as a new biocontrol agent, in control of many phytopathogenic diseases. To extend our understanding of the potential antifungal capacities, we did a whole genome analysis of strain CC09. Result shows that strain CC09 has a relatively large genome size (4.17Mb) with an average GC content of 46.1%, and 4021 predicted genes. Thirteen secondary metabolites encoding clusters have been identified within the genome of B...
March 2017: Microbiological Research
https://www.readbyqxmd.com/read/28160134/bacterial-and-fungal-proteolytic-enzymes-production-catalysis-and-potential-applications
#15
REVIEW
Ronivaldo Rodrigues da Silva
Submerged and solid-state bioprocesses have been extensively explored worldwide and employed in a number of important studies dealing with microbial cultivation for the production of enzymes. The development of these production technologies has facilitated the generation of new enzyme-based products with applications in pharmaceuticals, food, bioactive peptides, and basic research studies, among others. The applicability of microorganisms in biotechnology is potentiated because of their various advantages, including large-scale production, short time of cultivation, and ease of handling...
February 3, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28160128/blockade-of-the-kinin-b1-receptor-affects-the-cytokine-chemokine-profile-in-rat-brain-subjected-to-autoimmune-encephalomyelitis
#16
Karolina Podsiadło, Grzegorz Sulkowski, Beata Dąbrowska-Bouta, Lidia Strużyńska
Kinins are bioactive peptides which provide multiple functions, including critical regulation of the inflammatory response. Released during tissue injury, kinins potentiate the inflammation which represents a hallmark of numerous neurological disorders, including those of autoimmune origin such as multiple sclerosis (MS). In the present work, we assess the expression of B1 receptor (B1R) in rat brain during the course of experimental autoimmune encephalomyelitis (EAE) which is an animal model of MS. We apply pharmacological inhibition to investigate the role of this receptor in the development of neurological deficits and in shaping the cytokine/chemokine profile during the course of the disease...
February 3, 2017: Inflammopharmacology
https://www.readbyqxmd.com/read/28159792/molecular-characterization-and-phylogenetic-analysis-of-two-novel-fungal-phenolic-udp-glycosyltransferases-from-absidia-coerulea-and-rhizopus-japonicus
#17
Kebo Xie, Xiaoxiang Dou, Ridao Chen, Dawei Chen, Cheng Fang, Zhiyan Xiao, Jungui Dai
: In the present study, two novel phenolic UDP-glycosyltransferases (P-UGTs), UGT58A1 and UGT59A1, which can transfer sugar moieties from active donors to phenolic acceptors to generate corresponding glycosides, were identified from the fungi kingdom. UGT58A1 (from Absidia coerulea) and UGT59A1 (from Rhizopus japonicas) share a low degree of homology with known UGTs from animals, plants, bacteria, and virus. These two P-UGTs are membrane-bound proteins with an N-terminal signal peptide and a transmembrane domain at the C-terminus...
February 3, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28155167/inhibition-of-snake-venom-metalloproteinase-by-%C3%AE-lactoglobulin-peptide-from-buffalo-bubalus-bubalis-colostrum
#18
Ashok Arpitha, M Sebastin Santhosh, A C Rohit, K S Girish, D Vinod, H S Aparna
Bioactive peptide research has experienced considerable therapeutic interest owing to varied physiological functions, efficacy in excretion, and tolerability of peptides. Colostrum is a rich natural source of bioactive peptides with many properties elucidated such as anti-thrombotic, anti-hypertensive, opioid, immunomodulatory, etc. In this study, a variant peptide derived from β-lactoglobulin from buffalo colostrum was evaluated for the anti-ophidian property by targeting snake venom metalloproteinases. These are responsible for rapid local tissue damages that develop after snakebite such as edema, hemorrhage, myonecrosis, and extracellular matrix degradation...
February 2, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28152036/bioactivity-of-a-modified-human-glucagon-like-peptide-1
#19
Fangfang Xu, Kevin Yueju Wang, Nan Wang, Gangqiang Li, Dehu Liu
Diabetes has become the third largest cause of death in humans worldwide. Therefore, effective treatment for this disease remains a critical issue. Glucagon-like peptide-1 (GLP-1) plays an important role in glucose homeostasis, and therefore represents a promising candidate to use for the treatment of diabetes. Native GLP-1, however, is quickly degraded in in the circulatory system; which limits its clinical application. In the present study, a chemically-synthesized, modified analogue of human GLP-1 (mGLP-1) was designed...
2017: PloS One
https://www.readbyqxmd.com/read/28150423/the-efficacy-study-of-the-combination-of-tripeptide-10-citrulline-and-acetyl-hexapeptide-3-a-prospective-randomized-controlled-study
#20
Vassiliki Raikou, Athanasia Varvaresou, Irene Panderi, Effie Papageorgiou
BACKGROUND: Bioactive peptides have beneficial effects on the skin. OBJECTIVE: We investigated to evaluate the effect of acetyl hexapeptide-3 and tripeptide-10 citrulline and the possible synergism between these two peptides. METHODS: Twenty-four healthy volunteers were randomized to receive combination of acetyl hexapeptide-3 with tripeptide-10 citrulline (Group G1), tripeptide-10 citrulline (Group, G2), acetyl hexapeptide-3 (Group G3), or neither peptide (Group G4) for 60 days...
February 2, 2017: Journal of Cosmetic Dermatology
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