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Protein and Peptide Letters

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https://www.readbyqxmd.com/read/27908261/n-chlorosuccinimide-mediated-oxidative-chlorination-of-thiols-to-n%C3%AE-protected-amino-alkyl-sulfonyl-azides-and-their-utility-in-the-synthesis-of-sulfonyl-triazole-acids
#1
K M Sharnabai, M Krishnamurthy, N R Sagar, L Santhosh, Sureshbabu V Vommina
An efficient oxidative chlorination of thiols to Nα-protected amino alkyl sulfonyl azides is delineated. The reaction involves in situ generation of sulfonyl chloride employing N-chlorosuccinimide and tetrabutylammonium chloride-water in acetonitrile, followed by the reaction with sodium azide. The protocol is simple, straight forward, mild and high yielding. Amino acids with simple as well as bifunctional side chains were used to obtain Nα-protected amino alkyl sulfonyl azides. Further, sulfonyl azides were utilized to synthesize unnatural amino acids via Cu(OAc)2...
November 30, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27908260/-a-proteomics-approach-to-discover-drought-tolerance-proteins-in-wheat-pollen-grain-at-meiosis-stage
#2
Reza Fotovat, Mehdi Alikhani, Mostafa Valizadeh, Mehdi Mirzaei, Ghasem Hossein Salekdeh
Plants reproductive phase, when grain yield and consequently farmers' investment is most in jeopardy, is considered as the most sensitive stage to drought stress. In this study, we aimed to explore the proteomic response of wheat anther at meiosis stage in a drought tolerant, Darab, and susceptible, Shiraz, wheat genotypes. Wheat plants were exposed to drought stress at meiosis stage for four days under controlled environmental conditions. Then, anthers from both genotypes were sampled, and their proteomes were examined via quantitative proteomics analysis...
November 30, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27897110/identification-of-tyrosine-kinase-src-responsible-for-antimicrobial-peptides-production-in-bombyx-mori
#3
Xianyang Li, Xiaoting Hua, Liang Song, Qingyou Xia, Fei Wang
Src is a non-receptor protein tyrosine kinase ubiquitously expressed in animals. It is involved in various cellular processes, including the innate immune response in mammals. However, less is known about the function of insect Src. Here we presented a homologue of Src in silkworm (Bombyx mori), named as BmSrc by phylogenetic analysis, homologous comparison and domain prediction. BmSrc contains the conserved phosphorylation residues and possesses tyrosine kinase activity. The expression pattern of BmSrc mRNA was specific in stages and tissues...
November 29, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27894248/crystal-structure-of-murein-tripeptide-amidase-mpaa-from-escherichia-coli-o157-at-2-6-%C3%A3-resolution
#4
Yinliang Ma, Guohui Bai, Yaqi Cui, Jing Zhao, Zenglin Yuan, Xiuhua Liu
Peptidoglycan (PG) is an essential component of the cell wall, and undergoes reconstruction by various PG hydrolases during cell growth, development and division. The murein- tripeptide (Mtp) amidase MpaA belongs to PG hydrolase family and is responsible for cleaving the γ-D-Glu-meso-Dap amide bond in the Mtp released during PG turnover. The current paper reports the crystal structure of MpaA from Escherichia coli (E. coli) O157 at 2.6 Å resolution. The asymmetric unit consists of two protein molecules and each monomer represents the common α/β fold of metallo-carboxypeptidases (MCP)...
November 28, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27894247/aldose-reductase-as-a-drug-target-for-treatment-of-diabetic-nephropathy-promises-and-challenges
#5
Heba El Gamal, Shankar Munusamy
Diabetic nephropathy (DN) is one of the most serious microvascular complications of diabetes mellitus and the leading cause of end stage renal disease. One of the key pathways activated in DN is the polyol pathway, in which glucose is converted to sorbitol (a relatively non-metabolizable sugar) by the enzyme aldose reductase (AR). Shunting of glucose into this pathway causes disruption to glucose metabolism and subsequently damages the tissues via increased oxidative stress, protein kinase c activation and production of advanced glycation end products (AGE) in the kidney...
November 28, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27894246/therapy-related-changes-in-serum-proteome-patterns-of-early-stage-breast-cancer-patients-with-different-outcome
#6
Anna Walaszczyk, Monika Pietrowska, Anna Wojakowska, Agata Abramowicz, Aleksandra Chmura, Barbara Masłyk, Paweł Rodziewicz, Joanna Polańska, Katarzyna Behrendt, Elżbieta Nowicka, Rafał Tarnawski, Piotr Widłak
Adjuvant chemo- and/or radiotherapy is applied in majority of patients treated because of early stage breast cancer even though only a small fraction of them is at high risk of metastasis or recurrence. Hence, knowledge of biomarkers associated with risk of disease progression might help planning of an optimal therapy, and to protect large group of patients from toxicity of unnecessary treatment. Here we aimed to characterize serum proteome of patients diagnosed with early stage breast cancer who either showed no evidence of disease five years after the end of therapy or suffered from metastasis, relapse or second cancer during corresponding follow-up...
November 28, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27890004/lactic-acid-bacteria-as-cell-factories-for-the-generation-of-bioactive-peptides
#7
Lucía Brown, Esteban Vera Pingitore, Fernanda Mozzi, Lucila Saavedra, Josefina M Villegas, Elvira M Hebert
There is a growing interest in the incorporation of functional foods in the daily diet to achieve health promotion and disease risk reduction. Numerous studies have focused on the production of biologically active peptides as nutraceuticals and functional food ingredients due to their health benefits. These short peptides, displaying antihypertensive, antioxidant, mineral binding, immunomodulatory and antimicrobial activities are hidden in a latent state within the primary sequences of food proteins requiring enzymatic proteolysis for their release...
November 23, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27903234/acute-phase-proteins-and-their-potential-role-as-an-indicator-for-fish-health-and-in-diagnosis-of-fish-diseases
#8
Suvra Roy, Vikash Kumar, Vikas Kumar, B K Behera
The acute phase proteins are biochemically and functionally unrelated protein predominantly synthesized in the liver. The local inflammatory cells i.e. macrophages and neutrophils secretes various cytokines like IL-1, IL-6, IL-8 (interleukins) and TNF-α into bloodstream in response to injury and tissue damage, which stimulate hepatocytes to produce protein and release them into the circulation; these proteins are called as acute phase protein (e.g. C-reactive protein (CRP), serum amyloid A (SAA), metal binding protein, lysozyme, lectin, etc...
November 21, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27903233/evaluation-of-structure-chaperone-activity-and-allergenicity-of-reduced-glycated-adduct-of-bovine-%C3%AE-casein
#9
Reza Yousefi, Leila Ferdowsi, Zohreh Tavaf, Tanaz Sadeghian, Ali Mohammad Tamaddon, Mozhgan Moghtaderi, Zahra Pourpak
Milk has a potent reducing environment with an important quantity of sugar levels. In the current study β-casein was glycated in the presence of D-glucose and sodium cyanoborohydride as a reducing agent. Then, the reduced glucitol adduct of β-casein was used for the structural and functional analyses using different spectroscopic techniques. The results of fluorescence and far ultraviolet circular dichroism assessments suggest important structural alteration upon non-enzymatic glycation of β-casein. In addition, the chaperone activity, micellization properties and antioxidant activity of this protein were altered upon glucose modification...
November 21, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27903232/solution-structure-and-expression-profile-of-an-insect-cytokine-manduca-sexta-stress-response-peptide-2
#10
Lynn Goss Schrag, Xiaolong Cao, Alvaro Ivan Herrera, Yang Wang, Haobo Jiang, Om Prakash
Manduca sexta stress response peptide-2 (SRP2) is predicted to be a 25-residue peptide (FGVKDGKCPSGRVRRLGICVPDDDY), which may function as an insect cytokine to regulate immune responses. Produced as an inactive precursor, endogenous proSRP2 is probably converted to active SRP2 by limited proteolysis in response to invading pathogens, along with prophenoloxidase and pro-Spätzle activation. In addition to immunity, SRP2 may control head morphogenesis or other developmental processes in the lepidopteran insect...
November 21, 2016: Protein and Peptide Letters
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
#11
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/27834142/organ-specific-proteomic-analysis-of-early-vegetative-stage-soybean
#12
Mudassar Nawaz Khan, Setsuko Komatsu
Soybean is a nutritionally important source of proteins and oils. It exhibits organ-specific responses during growth and stressed conditions. To investigate the organ-specific growth pattern during early vegetative stage, a gel-free proteomic technique was used. A total of 357, 360, and 392 proteins were identified in root, hypocotyl, and leaf of vegetative stage soybean, respectively. Proteins belonging to functional categories of stress, cell organization, transport, signaling, and mitochondrial electron transport chain decreased in number from root to hypocotyl and leaf...
November 11, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27834141/in-vitro-exploration-of-the-anti-hcv-potential-of-the-synthetic-spacer-peptides-derived-from-human-bovine-and-camel-lactoferrins
#13
Abdulgader H Albar, Esmail M El-Fakharany, Hussein A Almehdar, Vladimir N Uversky, Elrashdy M Redwan
Chronic liver disease is often associated with the infection by hepatitis C virus (HCV), which is an enveloped RNA virus belonging to the Flaviviridae family. Many studies found that milk proteins, such as lactoferrin, might have profound antiviral activity against HCV. Various secretory fluids ranging from milk, to tears, saliva, and nasal secretion, and to bile and pancreatic juice, as well as neutrophils, mucosal surfaces, and blood contain a widely spread multifunctional glycoprotein, lactoferrin (Lf), structure of which can be depicted as two homologous domains connected by the short spacer peptide...
November 11, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27834140/hypoxic-exercise-training-promotes-apelin-apj-expression-in-skeletal-muscles-of-high-fat-diet-induced-obese-mice
#14
Weixiu Ji, Lijing Gong, Jianxiong Wang, Hui He, Ying Zhang
Apelin, an endogenous ligand of the G-protein-coupled receptor APJ, is a novel myokine and may play a key role in regulating energy metabolism. The purpose of the present study was to investigate the effects of hypoxic exposure, exercise, and hypoxic exercise training on the expression of apelin and APJ in skeletal muscle of obese mice. 60 two-month old C57BL/6J mice were randomly divided into two groups: 10 in normal diet group (N) and 50 in the high fat diet (HFD) groups. After two months of feeding, the HFD mice whose body weight 20% higher than the average weight of N group were selected as obese mice and were further allocated into four groups: Control (C), Exercise (E), Hypoxia (H), and Exercise plus Hypoxia (E+H), at 8-9 mice/group...
November 11, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27809749/fish-hydrolysates-a-regulatory-perspective-of-bioactive-peptides
#15
Bert Gevaert, Lieselotte Veryser, Frederick Verbeke, Evelien Wynendaele, Bart De Spiegeleer
For the first time introduced on the Japanese market, bioactive fish hydrolysates are now available all over the world as food supplements, functional food ingredients or nutricosmeceuticals. They are generally produced from low value fish waste, an almost inexhaustible source of raw material, and are sold as high value products, making them economically interesting from a manufacturer's view point. Most of these products have health or structure/function claims on their packages with different actions like antihypertensive, blood-glucose lowering, anxiolytic and skin anti-aging activities...
November 2, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27784229/discovery-and-biochemical-characterization-of-the-udp-xylose-biosynthesis-pathway-in-sphaerobacter-thermophilus
#16
Bin Gu, Pedro Laborda, Shuang Wei, Hui-Bo Song, Xu-Chu Duan, Li Liu, Josef Voglmeir
The biosynthesis of UDP-xylose requires the stepwise oxidation/decarboxylation of UDP-glucose, which is catalyzed by the enzymes UDP-glucuronic acid dehydrogenase (UGD) and UDP-xylose synthase (UXS). UDP-xylose biosynthesis is ubiquitous in animals and plants. However, only a few UGD and UXS isoforms of bacterial origin have thus far been biochemically characterized. Sphaerobacter thermophilus DSM 20745 is a bacterium isolated from heated sewage sludge, and therefore can be a valuable source of thermostable enzymes of biotechnological interest...
October 26, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27781954/biophysical-characterization-of-alanine-aminotransferase-from-trypanosoma-cruzi
#17
Stephanie Bath de Morais, Tatiana Arruda Campos Brasil de Souza, Ana Valeria Pereira Weiler, Mario Tyago Murakami
Aminotransferases are an important group of enzymes that catalyze the transfer of an amino group of an amino acid into a keto acid. Alanine aminotransferase from Trypanosoma cruzi (TcALAT) was cloned, overexpressed and purified. Far-UV Circular Dichroism (CD), Dynamic Light Scattering (DLS), Analytical Size Exclusion Chromatography (aSEC) and Small Angle X-ray Scattering (SAXS) provide data concerning TcALAT biophysical behavior. CD analysis displayed a typical spectrum of α-β proteins analogously as observed for other alanine aminotransferases...
October 25, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27781953/identification-of-egg-white-proteins-and-divergence-in-the-regulatory-region-of-the-ovalbumin-gene-in-avians
#18
Jindong Ren, Jianhong Hu, Li Chen, Yali Liu, Xiaoqin Xu, Jun He, Jianliang Shen, Lizhi Lu
Egg white proteins play an important role in avian reproductive systems and are an ideal resource for bioreactor construction. In this study, 1D electrophoresis and MALDI-TOF-MS were performed to analyze egg white proteins in four species. In total, 18, 11, 28, and 13 proteins were identified in the egg whites of the chicken, duck, goose, and pigeon, respectively. Egg white proteins in chickens have been studied previously; therefore, we focused on the proteins in goose and duck egg whites. Based on the amino acid sequence analysis and a comparison of the unique peptides, high similarity was observed between the goose and duck egg whites...
October 25, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27781955/mmp14-regulates-vegfr3-expression-on-corneal-epithelial-cells
#19
Robert Jin-Hong Chang, Dimitri T Azar, Kyu-Yeon Han
Vascular endothelial growth factor receptor 3 (VEGFR3) regulates the growth and differentiation of blood and lymphatic vessels. To determine whether matrix metalloproteinase 14 (MMP14) modulates VEGFR3 expression in the corneal epithelium to influence the avascularity of the cornea, VEGFR3 expression was compared between wild-type and MMP14-deficient (MMP14 Δexon4) corneal epithelial cells. Western blot analysis showed that VEGFR3 protein expression was higher on MMP14 Δexon4 corneal epithelial cells than on wild-type cells, and quantitative RT-PCR analysis showed that VEGFR3 gene expression was highly induced in MMP14 Δexon4 corneal epithelial cells but not in wild-type corneal epithelial cells or wild-type and MMP14 Δexon4 corneal keratocytes...
October 24, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27774893/opmsp-a-computational-method-integrating-protein-interaction-and-sequence-information-for-the-identification-of-novel-putative-oncogenes
#20
Lei Chen, Baoman Wang, ShaoPeng Wang, Jing Yang, Jerry Hu, ZhiQun Xie, Yuwei Wang, Tao Huang, Yu-Dong Cai, ZhiQun Xie
Oncogenes are genes that have the potential to cause cancer. Oncogene research can provide insight into the occurrence and development of cancer, thereby helping to prevent cancer and to design effective treatments. This study proposes a network method called the oncogene prediction method based on shortest path algorithm (OPMSP) for the identification of novel oncogenes in a large protein network built using protein-protein interaction data. Novel putative genes were extracted from the shortest paths connecting any two known oncogenes...
October 21, 2016: Protein and Peptide Letters
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