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https://www.readbyqxmd.com/read/28731187/isolation-and-purification-of-novel-peptides-derived-from-sepia-ink-effects-on-apoptosis-of-prostate-cancer-cell-pc%C3%A2-3
#1
Fangfang Huang, Yinwen Jing, Guofang Ding, Zuisu Yang
Novel prostate cancer therapeutics are in high demand. In order to identify potential therapeutic targets, protein from sepia ink was hydrolyzed by utilizing pepsin in an orthogonal array design. Pepsin hydrolysate (SH) obtained at optimal conditions exhibited the highest antitumor activity. Subsequently, a novel antitumor peptide, which was termed SHP, was isolated through ultrafiltration, gel filtration chromatography and reversed phase high‑performance liquid chromatography. The amino acid sequence of SHP was identified as Leu‑Lys‑Glu‑Glu‑Asn‑Arg‑Arg‑Arg‑Arg‑Asp with a molecular mass of 1371...
July 21, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28729856/biological-significance-of-marine-actinobacteria-of-east-coast-of-andhra-pradesh-india
#2
Alapati Kavitha, Handanahal S Savithri
An attempt was made to identify actinobacterial strains present in the marine soil of East Coast regions viz., Chirala, Bapatla, and Peddaganjam, Andhra Pradesh; Kanyakumari, Tamil Nadu and Goa, Goa along with the study of their antimicrobial potential. Eight out of 73 actinobacterial strains isolated from these regions showed strong antimicrobial activity against Gram positive bacteria, Gram negative bacteria, and Candida albicans. Molecular identification (16S rRNA analysis) of the eight strains revealed that they belong to Dietzia sp...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28729420/revisiting-the-substrate-specificity-of-mammalian-%C3%AE-1-6-fucosyltransferase-fut8-reveals-that-it-catalyzes-core-fucosylation-of-n-glycans-lacking-%C3%AE-1-3-arm-glcnac
#3
Qiang Yang, Roushu Zhang, Hui Cai, Lai-Xi Wang
The mammalian α1,6-fucosyltransferase (FUT8) catalyzes the core fucosylation of N-glycans in the biosynthesis of glycoproteins. Previously, intensive in vitro studies with crude extract or purified enzyme concluded that the attachment of a GlcNAc on the α1,3 mannose arm of N-glycan is essential for FUT8 catalyzed core fucosylation. In contrast, we have recently shown that expression of erythropoietin (EPO) in a GnTI-knockout, FUT8 overexpressing cell line results in the production of fully core-fucosylated glycoforms of the oligomannose substrate Man5GlcNAc2, suggesting that FUT8 can catalyze core fucosylation of N-glycans lacking an α1,3arm GlcNAc in cells...
July 20, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28727443/plasmonic-thermal-decomposition-digestion-of-proteins-a-rapid-on-surface-protein-digestion-technique-for-mass-spectrometry-imaging
#4
Rong Zhou, Franco Basile
A method based on plasmon surface resonance absorption and heating was developed to perform a rapid on-surface protein thermal decomposition and digestion suitable for imaging MS and/or profiling. This photo-thermal process or plasmonic thermal decomposition/digestion (plasmonic-TDD) method incorporates a continuous wave (CW) laser excitation and gold nanoparticles (Au-NPs) to induce known thermal decomposition reactions that cleave peptides and proteins specifically at the C-terminus of aspartic acid and at the N-terminus of cysteine...
July 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28722749/rho-associated-protein-kinases-as-therapeutic-targets-for-both-vascular-and-parenchymal-pathologies-in-alzheimer-s-disease
#5
REVIEW
Aaron Y Lai, JoAnne McLaurin
The causes of late-onset Alzheimer's disease are unclear and likely multifactorial. Rho-associated protein kinases (ROCKs) are ubiquitously expressed signaling messengers that mediate a wide array of cellular processes. Interestingly, they play an important role in several vascular and brain pathologies implicated in Alzheimer's etiology, including hypertension, hypercholesterolemia, blood-brain barrier disruption, oxidative stress, deposition of vascular and parenchymal amyloid-beta peptides, tau hyperphosphorylation, and cognitive decline...
July 19, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28720735/a-nonredundant-phosphopantetheinyl-transferase-ppta-is-a-novel-antifungal-target-that-directs-secondary-metabolite-siderophore-and-lysine-biosynthesis-in-aspergillus-fumigatus-and-is-critical-for-pathogenicity
#6
Anna Johns, Daniel H Scharf, Fabio Gsaller, Hella Schmidt, Thorsten Heinekamp, Maria Straßburger, Jason D Oliver, Mike Birch, Nicola Beckmann, Katharine S Dobb, Jane Gilsenan, Bharatkumar Rash, Elaine Bignell, Axel A Brakhage, Michael J Bromley
Secondary metabolites are key mediators of virulence for many pathogens. Aspergillus fumigatus produces a vast array of these bioactive molecules, the biosynthesis of which is catalyzed by nonribosomal peptide synthetases (NRPSs) or polyketide synthases (PKSs). Both NRPSs and PKSs harbor carrier domains that are primed for acceptance of secondary metabolic building blocks by a phosphopantetheinyl transferase (P-pant). The A. fumigatus P-pant PptA has been shown to prime the putative NRPS Pes1 in vitro and has an independent role in lysine biosynthesis; however, its role in global secondary metabolism and its impact on virulence has not been described...
July 18, 2017: MBio
https://www.readbyqxmd.com/read/28719743/machine-learning-on-samdi-mass-spectrometry-signal-to-noise-ratio-improves-peptide-array-designs
#7
Albert Yan Xue, Lindsey C Szymczak, Milan Mrksich, Neda Bagheri
Emerging peptide array technologies are able to profile molecular activities within cell lysates. However, the structural diversity of peptides leads to inherent differences in peptide signal to noise ratios (S/N). These complex effects can lead to potentially unrepresentative signal intensities and can bias subsequent analyses. Within mass spectrometry-based peptide technologies, the relation between a peptide's amino acid sequence and S/N remains largely non-quantitative. To address this challenge, we present a method to quantify and analyze mass spectrometry S/N of two peptide arrays, and we use this analysis to portray quality of data and to design future arrays for SAMDI mass spectrometry...
July 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28715465/multiplexing-detection-of-igg-against-plasmodium-falciparum-pregnancy-specific-antigens
#8
Ana Maria Fonseca, Llorenç Quinto, Alfons Jiménez, Raquel González, Azucena Bardají, Sonia Maculuve, Carlota Dobaño, Maria Rupérez, Anifa Vala, John J Aponte, Esperanza Sevene, Eusebio Macete, Clara Menéndez, Alfredo Mayor
BACKGROUND: Pregnant women exposed to Plasmodium falciparum generate antibodies against VAR2CSA, the parasite protein that mediates adhesion of infected erythrocytes to the placenta. There is a need of high-throughput tools to determine the fine specificity of these antibodies that can be used to identify immune correlates of protection and exposure. Here we aimed at developing a multiplex-immunoassay to detect antibodies against VAR2CSA antigens. METHODS AND FINDINGS: We constructed two multiplex-bead arrays, one composed of 3 VAR2CSA recombinant-domains (DBL3X, DBL5Ɛ and DBL6Ɛ) and another composed of 46 new peptides covering VAR2CSA conserved and semi-conserved regions...
2017: PloS One
https://www.readbyqxmd.com/read/28715228/mid-infrared-plasmonic-circular-dichroism-generated-by-graphene-nanodisk-assemblies
#9
Xiang-Tian Kong, Runbo Zhao, Zhiming Wang, Alexander O Govorov
It is very interesting to bring plasmonic circular dichroism spectroscopy to the mid-infrared spectral interval, and there are two reasons for this. This spectral interval is very important for thermal bioimaging, and simultaneously, this spectral range includes vibrational lines of many chiral biomolecules. Here we demonstrate that graphene plasmons indeed offer such opportunity. In particular, we show that chiral graphene assemblies consisting of a few graphene nanodisks can generate strong circular dichroism (CD) in the mid-infrared interval...
July 20, 2017: Nano Letters
https://www.readbyqxmd.com/read/28715014/amyloid-scaffolds-as-alternative-chlorosomes
#10
REVIEW
Rolando F Rengifo, Noel X Li, Anthony Sementilli, David G Lynn
Living systems contain remarkable functional capability built within sophisticated self-organizing frameworks. Defining the assembly codes that coordinate these systems could greatly extend nanobiotechnology. To that end, we have highlighted the self-assembling architecture of the chlorosome antenna arrays and report the emulation and extension of their features for the development of cell-compatible photoredox materials. We specifically review work on amyloid peptide scaffolds able to (1) organize light-harvesting chromophores, (2) break peptide bilayer symmetry for directional energy and electron transfer, and (3) incorporate redox active metal ions at high density for energy storage...
July 17, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28700743/polymorphisms-in-the-vitamin-d-receptor-gene-are-associated-with-reduced-rate-of-sputum-culture-conversion-in-multidrug-resistant-tuberculosis-patients-in-south-africa
#11
Matthew J Magee, Yan V Sun, James C M Brust, N Sarita Shah, Yuming Ning, Salim Allana, Angela Campbell, Qin Hui, Koleka Mlisana, Pravi Moodley, Neel R Gandhi
BACKGROUND: Vitamin D modulates the inflammatory and immune response to tuberculosis (TB) and also mediates the induction of the antimicrobial peptide cathelicidin. Deficiency of 25-hydroxyvitamin D and single nucleotide polymorphisms (SNPs) in the vitamin D receptor (VDR) gene may increase the risk of TB disease and decrease culture conversion rates in drug susceptible TB. Whether these VDR SNPs are found in African populations or impact multidrug-resistant (MDR) TB treatment has not been established...
2017: PloS One
https://www.readbyqxmd.com/read/28700225/combining-elements-from-two-antagonists-of-formyl-peptide-receptor-2-generates-more-potent-peptidomimetic-antagonists
#12
Sarah Line Skovbakke, André Holdfeldt, Christina Nielsen, Anna Mette Hansen, Iris Perez-Gassol, Claes Dahlgren, Huamei Forsman, Henrik Franzyk
Structural optimization of a peptidomimetic antagonist of formyl peptide receptor 2 (FPR2) was explored by an approach involving combination of elements from the two most potent FPR2 antagonists described: a Rhodamine B-conjugated 10-residue gelsonin-derived peptide (i.e., PBP10: RhB-QRLFQVKGRR-OH) and the palmitoylated α-peptide/β-peptoid hybrid Pam-(Lys-βNspe)6-NH2. This generated an array of hybrid compounds from which a new subclass of receptor-selective antagonists was identified. The most potent representatives displayed activity in the low nanomolar range...
July 12, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28694070/the-roles-of-actin-binding-domains-1-and-2-in-the-calcium-dependent-regulation-of-actin-filament-bundling-by-human-plastins
#13
Christopher L Schwebach, Richa Agrawal, Steffen Lindert, Elena Kudryashova, Dmitri S Kudryashov
The actin cytoskeleton is a complex network controlled by a vast array of intricately regulated actin binding proteins. Human plastins (PLS1, 2, and 3) are evolutionary conserved proteins that non-covalently crosslink actin filaments into tight bundles. Through stabilization of such bundles, plastins contribute, in an isoform-specific manner, to the formation of kidney and intestinal microvilli, inner ear stereocilia, immune synapses, endocytic patches, adhesion contacts, and invadosomes of immune and cancer cells...
July 7, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28691775/short-peptides-directing-1d-helical-arrays-of-polyoxometalates-with-controllable-pitches
#14
Jingfang Li, Xiangyi Li, Fengrui Jiang, Xiaodong Li, Xiaoming Xie, Lixin Wu, Liyan Wang, Myongsoo Lee, Wen Li
A series of cationic peptides with alternating hydrophilic and hydrophobic residues were elaborately designed and synthesized. These kinds of short peptides with protonated lysine groups can interact with anionic polyoxometalate nanoclusters through multivalent ionic bonds and hydrogen bonds, resulting in the formation of helical polyoxometalate arrays in aqueous solution. Fourier transform infrared (FT-IR) spectroscopy, circular dichroism (CD), transmission electron microscopy (TEM), and dynamic light scattering (DLS) were utilized to characterize the self-assembly structures...
July 10, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28689639/regulation-of-inflammation-by-members-of-the-formyl-peptide-receptor-family
#15
REVIEW
Keqiang Chen, Zhiyao Bao, Wanghua Gong, Peng Tang, Teizo Yoshimura, Ji Ming Wang
Inflammation is associated with a variety of diseases. The hallmark of inflammation is leukocyte infiltration at disease sites in response to pathogen- or damage-associated chemotactic molecular patterns (PAMPs and MAMPs), which are recognized by a superfamily of seven transmembrane, Gi-protein-coupled receptors (GPCRs) on cell surface. Chemotactic GPCRs are composed of two major subfamilies: the classical GPCRs and chemokine GPCRs. Formyl-peptide receptors (FPRs) belong to the classical chemotactic GPCR subfamily with unique properties that are increasingly appreciated for their expression on diverse host cell types and the capacity to interact with a plethora of chemotactic PAMPs and MAMPs...
July 6, 2017: Journal of Autoimmunity
https://www.readbyqxmd.com/read/28686416/decorating-self-assembled-peptide-cages-with-proteins
#16
James F Ross, Angela Bridges, Jordan M Fletcher, Deborah Shoemark, Dominic Alibhai, Harriet E V Bray, Joseph L Beesley, William M Dawson, Lorna R Hodgson, Judith Mantell, Paul Verkade, Colin M Edge, Richard B Sessions, David Tew, Derek N Woolfson
An ability to organize and encapsulate multiple active proteins into defined objects and spaces at the nanoscale has potential applications in biotechnology, nanotechnology, and synthetic biology. Previously, we have described the design, assembly, and characterization of peptide-based self-assembled cages (SAGEs). These ≈100 nm particles comprise thousands of copies of de novo designed peptide-based hubs that array into a hexagonal network and close to give caged structures. Here, we show that, when fused to the designed peptides, various natural proteins can be co-assembled into SAGE particles...
July 11, 2017: ACS Nano
https://www.readbyqxmd.com/read/28681555/the-structure-of-plasmodium-falciparum-3d7_0606800-reveals-a-bi-lobed-architecture-that-supports-re-annotation-as-a-venus-flytrap-protein
#17
Michelle L Parker, Raghavendran Ramaswamy, Kyle van Gordon, Cameron Powell, Jürgen Bosch, Martin J Boulanger
Plasmodium falciparum, the causative agent of malaria, employs a diverse array of surface displayed proteins to promote dissemination and establish infection in the human host. Of these, Pf3D7_0606800 is highly immunogenic and has been designated a potential top 10 candidate for inclusion in a multicomponent malarial vaccine. The role of Pf3D7_0606800 in parasite biology, however, is unknown and its characterization has been complicated by a lack of sequence identity with proteins of known structure or function...
July 6, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28680140/generation-of-novel-patient-derived-cic-dux4-sarcoma-xenografts-and-cell-lines
#18
Rieko Oyama, Mami Takahashi, Akihiko Yoshida, Marimu Sakumoto, Yoko Takai, Fusako Kito, Kumiko Shiozawa, Zhiwei Qiao, Yasuhito Arai, Tatsuhiro Shibata, Yoshihiro Araki, Makoto Endo, Akira Kawai, Tadashi Kondo
CIC-DUX4 sarcoma (CDS) is a group of rare, mesenchymal, small round cell tumours that harbour the unique CIC-DUX4 translocation, which causes aberrant gene expression. CDS exhibits an aggressive course and poor clinical outcome, thus novel therapeutic approaches are needed for CDS treatment. Although patient-derived cancer models are an essential modality to develop novel therapies, none currently exist for CDS. Thus, the present study successfully established CDS patient-derived xenografts and subsequently generated two CDS cell lines from the grafted tumours...
July 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28679051/fabrication-of-supramolecular-n-p-nanowires-via-coassembly-of-oppositely-charged-peptide-chromophore-systems-in-aqueous-media
#19
Mohammad Aref Khalily, Gokhan Bakan, Betul Kucukoz, Ahmet Emin Topal, Ahmet Karatay, H Gul Yaglioglu, Aykutlu Dana, Mustafa O Guler
Fabrication of supramolecular electroactive materials at the nanoscale with well-defined size, shape, composition, and organization in aqueous medium is a current challenge. Herein we report construction of supramolecular charge-transfer complex one-dimensional (1D) nanowires consisting of highly ordered mixed-stack π-electron donor-acceptor (D-A) domains. We synthesized n-type and p-type β-sheet forming short peptide-chromophore conjugates, which assemble separately into well-ordered nanofibers in aqueous media...
July 11, 2017: ACS Nano
https://www.readbyqxmd.com/read/28678845/polymerase-free-measurement-of-microrna-122-with-single-base-specificity-using-single-molecule-arrays-detection-of-drug-induced-liver-injury
#20
David M Rissin, Barbara López-Longarela, Salvatore Pernagallo, Hugh Ilyine, A D Bastiaan Vliegenthart, James W Dear, Juan J Díaz-Mochón, David C Duffy
We have developed a single probe method for detecting microRNA from human serum using single molecule arrays, with sequence specificity down to a single base, and without the use of amplification by polymerases. An abasic peptide nucleic acid (PNA) probe-containing a reactive amine instead of a nucleotide at a specific position in the sequence-for detecting a microRNA was conjugated to superparamagnetic beads. These beads were incubated with a sample containing microRNA, a biotinylated reactive nucleobase-containing an aldehyde group-that was complementary to the missing base in the probe sequence, and a reducing agent...
2017: PloS One
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