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Antimicrobial peptides

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https://www.readbyqxmd.com/read/29667836/molecular-dynamics-simulations-are-redefining-our-view-of-peptides-interacting-with-biological-membranes
#1
Jakob P Ulmschneider, Martin B Ulmschneider
Ever since the first molecular mechanics computer simulations of biological molecules became possible, there has been the dream to study all complex biological phenomena in silico, simply bypassing the enormous experimental challenges and their associated costs. For this, two inherent requirements need to be met: First, the time scales achievable in simulations must reach up to the millisecond range and even longer. Second, the computational model must accurately reproduce what is measured experimentally. Despite some recent successes, the general consensus in the field to date has been that neither of these conditions have yet been met and that the dream will be realized, if at all, only in the distant future...
April 18, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29666616/stem-cell-transcription-factor-foxo-controls-microbiome-resilience-in-hydra
#2
Benedikt M Mortzfeld, Jan Taubenheim, Sebastian Fraune, Alexander V Klimovich, Thomas C G Bosch
The aging process is considered to be the result of accumulating cellular deterioration in an individual organism over time. It can be affected by the combined influence of genetic, epigenetic, and environmental factors including life-style-associated events. In the non-senescent freshwater polyp Hydra , one of the classical model systems for evolutionary developmental biology and regeneration, transcription factor FoxO modulates both stem cell proliferation and innate immunity. This provides strong support for the role of FoxO as a critical rate-of-aging regulator...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29665857/the-htlv-1-oncoprotein-tax-is-modified-by-the-ubiquitin-related-modifier-1-urm1
#3
Rita Hleihel, Behzad Khoshnood, Ingrid Dacklin, Hayssam Omran, Carine Mouawad, Zeina Dassouki, Marwan El-Sabban, Margret Shirinian, Caroline Grabbe, Ali Bazarbachi
BACKGROUND: Adult T-cell leukemia/lymphoma (ATL) is an aggressive malignancy secondary to chronic human T-cell lymphotropic virus 1 infection, triggered by the virally encoded oncoprotein Tax. The transforming activity and subcellular localization of Tax is strongly influenced by posttranslational modifications, among which ubiquitylation and SUMOylation have been identified as key regulators of the nuclear/cytoplasmic shuttling of Tax, as well as its ability to activate NF-κB signaling...
April 17, 2018: Retrovirology
https://www.readbyqxmd.com/read/29665678/lectin-functionalized-composite-hydrogels-for-capture-and-killing-of-carbapenem-resistant-pseudomonas-aeruginosa
#4
Nicholas Bodenberger, Dennis Kubiczek, Daniel Halbgebauer, Vittoria Rimola, Sebastian Wiese, Daniel Mayer, Armando Alexei Rodr Iacute Guez Alfonso, Ludger Ständker, Steffen Stenger, Frank Rosenau
Infections with multi-resistant pathogens are a leading cause for mortality worldwide. Just recently, the world health organization (WHO) increased the threat rating for multi-resistant Pseudomonas aeruginosa to the highest possible level. With this background it is crucial to develop novel materials and procedures in the fight against multi-resistant pathogens. In this study we present a novel antimicrobial material, which could find applications as a wound dressing or antimicrobial coating. Lectins are multivalent sugar-binding proteins, which can be found in a variety of plants and bacteria, where they are associated with biofilm formation...
April 17, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29665030/dermatologic-toxicity-from-novel-therapy-using-antimicrobial-peptide-ll-37-in-melanoma-a-detailed-examination-of-the-clinicopathologic-features
#5
Tsetan Dolkar, Celestine M Trinidad, Kelly C Nelson, Rodabe N Amaria, Priyadharsini Nagarajan, Carlos A Torres-Cabala, Doina Ivan, Victor G Prieto, Michael T Tetzlaff, Jonathan L Curry, Phyu P Aung
LL-37 is a naturally occurring 37-amino acid that is part of innate immunity in human skin. Preclinical studies have demonstrated that intra-tumoral injections of LL-37 stimulate the innate immune system by activation of plasmacytoid dendritic cells, which mediate tumor destruction. LL-37 intra-tumoral injections have been utilized in a Phase 1 clinical trial for melanoma patients with cutaneous metastases. We report dermatologic toxicity in a 63-year-old woman with stage IIIC melanoma of the right calf and inguinal lymph nodes...
April 17, 2018: Journal of Cutaneous Pathology
https://www.readbyqxmd.com/read/29665026/anhydrous-polymer-based-coating-with-sustainable-controlled-release-functionality-for-facile-efficacious-impregnation-and-delivery-of-antimicrobial-peptides
#6
Kaiyang Lim, Rathi Saravanan, Kian Long Kelvin Chong, Hwee Mian Sharon Goh, Ray Rong Yuan Chua, Paul Anantharajah Tambyah, Matthew Wook Chang, Kimberly A Kline, Susanna Su Jan Leong
Anhydrous polymers are actively explored as alternative materials to overcome limitations of conventional hydrogel-based antibacterial coating. However, the requirement for strong organic solvent in polymerization reactions often necessitates extra protection steps for encapsulation of target biomolecules, lowering encapsulation efficiency and increasing process complexity. This study reports a novel coating strategy that allows direct solvation and encapsulation of antimicrobial peptides (HHC36) into anhydrous polycaprolactone (PCL) polymer-based dual layer coating...
April 17, 2018: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/29663932/studies-on-the-antibacterial-activity-and-mechanism-of-antimicrobial-peptides-against-drug-resistant-bacteria
#7
Xiaofang Luo, Yanjun Liu, Zuodong Qin, Zhiyuan Jin, Liting Xu, Yang Liu, Linyan Cao, Fulin He, Xiaohong Gu, Xiaoping Ouyang
Antibiotic resistance is a growing threat to human health. More than anything else, multidrug-resistant gram-negative bacteria pose the biggest challenge to healthcare, which is predominantly due to the lack of effective therapeutic options. In the present study, we investigated the activities of peptides HX-12A, HX-12B and HX-12C against MDRAB and MDRKP isolates in vitro. Those three peptides displayed high antibacterial activities and rapid bactericidal effects against MDRAB and MDRKP isolates. Additionally, the peptides retained their activity even being present in pH 6...
March 1, 2018: Journal of Biomedical Nanotechnology
https://www.readbyqxmd.com/read/29663872/antimicrobial-peptides-as-mediators-of-innate-immunity
#8
EDITORIAL
Jirillo Emilio, Thea Magrone
No abstract text is available yet for this article.
April 15, 2018: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/29663680/knowledge-gaps-in-control-of-campylobacter-for-prevention-of-campylobacteriosis
#9
I Hansson, M Sandberg, I Habib, R Lowman, E O Engvall
Campylobacteriosis is an important, worldwide public health problem with numerous socio-economic impacts. Since 2015, approximately 230,000 cases have been reported annually in Europe. In the United States, Australia and New Zealand, campylobacteriosis is the most commonly reported disease. Poultry and poultry products are considered important sources of human infections. Poultry meat can become contaminated with Campylobacter during slaughter if live chickens are intestinal carriers. Campylobacter spp. can be transferred from animals to humans through consumption and handling of contaminated food products, with fresh chicken meat being the most commonly implicated food type...
April 16, 2018: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/29663584/silencing-of-apis-mellifera-dorsal-genes-reveals-their-role-in-expression-of-the-antimicrobial-peptide-defensin-1
#10
Anete Pedro Lourenço, Mônica Mazzei Florecki, Zilá Luz Paulino Simões, Jay Daniel Evans
Like all other insects, two key signaling pathways (Toll and Imd) regulate the induction of honey bee immune effectors that target microbial pathogens. Among these effectors are antimicrobial peptides (AMPs) that are presumed to be produced by the NF-κB factors Dorsal and Relish from the Toll and Imd pathways, respectively. Using in silico analysis, we previously proposed that the honey bee AMP defensin-1 was regulated by the Toll pathway, while hymenoptaecin was regulated by Imd and abaecin by both the Toll and Imd pathways...
April 17, 2018: Insect Molecular Biology
https://www.readbyqxmd.com/read/29662839/the-saposin-like-protein-apld-displays-pore-forming-activity-and-participates-in-defense-against-bacterial-infection-during-a-multicellular-stage-of-dictyostelium-discoideum
#11
Ranjani Dhakshinamoorthy, Moritz Bitzhenner, Pierre Cosson, Thierry Soldati, Matthias Leippe
Due to their archaic life style and microbivor behavior, amoebae may represent a source of antimicrobial peptides and proteins. The amoebic protozoon Dictyostelium discoideum has been a model organism in cell biology for decades and has recently also been used for research on host-pathogen interactions and the evolution of innate immunity. In the genome of D. discoideum , genes can be identified that potentially allow the synthesis of a variety of antimicrobial proteins. However, at the protein level only very few antimicrobial proteins have been characterized that may interact directly with bacteria and help in fighting infection of D...
2018: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29662475/the-luxr-regulators-pcor-and-rfia-co-regulate-antimicrobial-peptide-and-alginate-production-in-pseudomonas-corrugata
#12
Grazia Licciardello, Andrea Caruso, Patrizia Bella, Rodolpho Gheleri, Cinzia P Strano, Alice Anzalone, Emmanouil A Trantas, Panagiotis F Sarris, Nalvo F Almeida, Vittoria Catara
Cyclic lipopeptides (CLPs) are considered as some of the most important secondary metabolites in different plant-associated bacteria, thanks to their antimicrobial, cytotoxic, and surfactant properties. In this study, our aim was to investigate the role of the Quorum Sensing (QS) system, PcoI/PcoR, and the LuxR-type transcriptional regulator RfiA in CLP production in the phytopatogenic bacterium, Pseudomonas corrugata based on our previous work where we reported that the pcoR and rfiA mutants were devoid of the CLPs cormycin and corpeptin production...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29662055/in-silico-optimization-of-a-guava-antimicrobial-peptide-enables-combinatorial-exploration-for-peptide-design
#13
William F Porto, Luz Irazazabal, Eliane S F Alves, Suzana M Ribeiro, Carolina O Matos, Állan S Pires, Isabel C M Fensterseifer, Vivian J Miranda, Evan F Haney, Vincent Humblot, Marcelo D T Torres, Robert E W Hancock, Luciano M Liao, Ali Ladram, Timothy K Lu, Cesar de la Fuente-Nunez, Octavio L Franco
Plants are extensively used in traditional medicine, and several plant antimicrobial peptides have been described as potential alternatives to conventional antibiotics. However, after more than four decades of research no plant antimicrobial peptide is currently used for treating bacterial infections, due to their length, post-translational modifications or  high dose requirement for a therapeutic effect . Here we report the design of antimicrobial peptides derived from a guava glycine-rich peptide using a genetic algorithm...
April 16, 2018: Nature Communications
https://www.readbyqxmd.com/read/29661271/antimicrobial-peptide-expression-in-a-wild-tobacco-plant-reveals-the-limits-of-host-microbe-manipulations-in-the-field
#14
Arne Weinhold, Elham Karimi Dorcheh, Ran Li, Natarajan Rameshkumar, Ian T Baldwin
Plant-microbe associations are thought to be beneficial for plant growth and resistance against biotic or abiotic stresses, but for natural ecosystems, the ecological analysis of microbiome function remains in its infancy. We used transformed wild tobacco plants ( Nicotiana attenuata ) which constitutively express an antimicrobial peptide (Mc-AMP1) of the common ice plant, to establish an ecological tool for plant-microbe studies in the field. Transgenic plants showed in planta activity against plant-beneficial bacteria and were phenotyped within the plants´ natural habitat regarding growth, fitness and the resistance against herbivores...
April 17, 2018: ELife
https://www.readbyqxmd.com/read/29660601/a-qcm-d-study-of-the-concentration-and-time-dependent-interactions-of-human-ll37-with-model-mammalian-lipid-bilayers
#15
Lindsay D Lozeau, Marsha W Rolle, Terri A Camesano
The human antimicrobial peptide LL37 is promising as an alternative to antibiotics due to its biophysical interactions with charged bacterial lipids. However, its clinical potential is limited due to its interactions with zwitterionic mammalian lipids leading to cytotoxicity. Mechanistic insight into the LL37 interactions with mammalian lipids may enable rational design of less toxic LL37-based therapeutics. To this end, we studied concentration- and time-dependent interactions of LL37 with zwitterionic model phosphatidylcholine (PC) bilayers with quartz crystal microbalance with dissipation (QCM-D)...
April 5, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29659799/exposure-of-escherichia-coli-to-human-hepcidin-results-in-differential-expression-of-genes-associated-with-iron-homeostasis-and-oxidative-stress
#16
Michael J Pascoe, Jiraporn Lueangsakulthai, Delia Ripley, Roger H Morris, Sarah E Maddocks
Hepcidin belongs to the antimicrobial peptide family but has weak activity with regards to bacterial killing. The regulatory function of hepcidin in humans serves to maintain an iron-restricted environment that limits the growth of pathogens; this study explored whether hepcidin affected bacterial iron homeostasis and oxidative stress using the model organism Escherichia coli. Using the Miller assay it was determined that under low iron availability exposure to sub-inhibitory doses of hepcidin (4 -12μM) led to 2-fold and 4-fold increases in the expression of ftnA and bfd respectively (p < 0...
April 6, 2018: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/29657403/antimicrobial-peptides-of-buffalo-and-their-role-in-host-defenses
#17
REVIEW
Khangembam Victoria Chanu, Dimpal Thakuria, Satish Kumar
Antimicrobial peptides (AMPs) are highly conserved components of the innate immune system found among all classes of life. Buffalo ( Bubalus bubalis ), an important livestock for milk and meat production, is known to have a better resistance to many diseases as compared to cattle. They are found to express many AMPs such as defensins, cathelicidins, and hepcidin which play an important role in neutralizing the invading pathogens. Buffalo AMPs exhibit broad-spectrum antimicrobial activity against both Gram-positive and Gram-negative bacteria...
February 2018: Veterinary World
https://www.readbyqxmd.com/read/29656422/role-of-lactoferrin-and-lactoferrin-derived-peptides-in-oral-and-maxillofacial-diseases
#18
REVIEW
Kabilan Velliyagounder, Dania Bahdila, Siddhi Pawar, Daniel H Fine
The oral cavity harbors different taxonomic groups, the evolutionary co-existence of which develops the oral ecosystem. These resident microorganisms can alter the balance between the physiologic and pathologic conditions that affect the host, both locally and systemically. This highly sophisticated nature of the oral cavity poses a significant therapeutic challenge. Numerous human and animal studies have been conducted to potentiate the efficacy and competence of current treatments of pathologic conditions as well as to develop novel therapeutic modalities...
April 14, 2018: Oral Diseases
https://www.readbyqxmd.com/read/29652914/intestinal-manipulation-affects-mucosal-antimicrobial-defense-in-a-mouse-model-of-postoperative-ileus
#19
Kathy Stein, Lena Hieggelke, Bianca Schneiker, Mariola Lysson, Burkhard Stoffels, Sabine Nuding, Jan Wehkamp, Judith Kikhney, Annette Moter, Joerg C Kalff, Sven Wehner
AIM: To explore the effects of abdominal surgery and interleukin-1 signaling on antimicrobial defense in a model of postoperative ileus. METHODS: C57BL/6 and Interleukin-1 receptor type I (IL-1R1) deficient mice underwent intestinal manipulation to induce POI. Expression of mucosal IL-1α, IL-1β and IL-1R1 and several antimicrobial peptides and enzymes were measured by quantitative PCR or ELISA, western blotting or immunohistochemistry. Bacterial overgrowth was determined by fluorescent in-situ hybridization and counting of jejunal luminal bacteria...
2018: PloS One
https://www.readbyqxmd.com/read/29652823/molecular-dynamics-simulations-of-human-antimicrobial-peptide-ll-37-in-model-popc-and-popg-lipid-bilayers
#20
Liling Zhao, Zanxia Cao, Yunqiang Bian, Guodong Hu, Jihua Wang, Yaoqi Zhou
Cathelicidins are a large family of cationic antimicrobial peptides (AMPs) found in mammals with broad spectrum antimicrobial activity. LL-37 is the sole amphipathic α-helical AMP from human Cathelicidins family. In addition to its bactericidal capability, LL-37 has antiviral, anti-tumor, and immunoregulatory activity. Despite many experimental studies, its molecular mechanism of action is not yet fully understood. Here, we performed three independent molecular dynamics simulations (600 ns or more) of a LL-37 peptide in the presence of 256 lipid bilayers with 1-palmitoyl-2-oleoyl- sn -glycero-3-phosphoglycerol (POPG) mimicking bacterial and 1-palmitoyl-2-oleoyl- sn -glycero-3-phosphocholine (POPC) mimicking mammalian membranes...
April 13, 2018: International Journal of Molecular Sciences
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