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Protein and Peptide Letters

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https://www.readbyqxmd.com/read/28901858/expression-of-a-nitric-oxide-synthesizing-protein-in-arterial-endothelial-cells-in-response-to-different-anti-anginal-agents-used-in-acute-coronary-syndromes
#1
Sarbashri Bank, Pradipta Jana, G V Girish, Asru Sinha, Smarajit Maiti
Organic "nitro" compounds such as nitroglycerine, isosorbate nitrate are useful in the control of chest pain in acute coronary syndrome. But the mechanism of it in pain regulation remains speculative. Here, increase of NO production was investigated by the possible regulation of constitutive nitric oxide synthase (cNOS) function from goat arterial endothelial cells. This protein was purified and sequence wise characterized as protein disulfide isomerase (PDI) in response to different nitro compounds. The NO generating protein was isolated from arterial endothelial cells and prepared to homogeneity...
September 11, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28875829/the-versatility-of-tumor-suppressor-proteins-and-its-therapeutic-potential
#2
Razvan T Radulescu
Three important aspects of tumor suppressor protein (TSP) function are highlighted here: anti-inflammatory activity, wound healing and storage. These features should foster both TSP understanding and drug design.
August 30, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28828974/the-renin-angiotensin-system-and-the-neurodegenerative-diseases-a-brief-review
#3
Ana Flavia Almeida-Santos, Lucas Miranda Kangussu, Maria Jose Campagnole-Santos
A large body of studies characterized the renal and cardiovascular effects of the peptides of the renin-angiotensin system (RAS). We now recognize that, in addition to angiotensin (Ang) II and Ang III, other peptides, such as, Ang-(1-7), Ang-(1-9), Ang IV and Alamandine can mediate the actions of RAS in different tissues, including the brain. The effects elicited by angiotensins in the brain are complex, site specific and dependent on the interaction with selective receptors, angiotensin type 1 receptor (AT1), AT2, Mas or MrgD, which present widespread distribution in the central nervous system...
August 22, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28828973/be-aware-of-immunogenic-but-not-protective-antigens-the-actinobacillus-pleuropneumoniae-pala-as-an-example
#4
Caihong Liu, Yurou Cao, Jihong Yang, Haobin Zhao, Kashif Rafiq Zahid, Jin Zhao, Chao Qi, Jinlin Liu
Identification of immunogenic antigens is an important step for the vaccine improvement of infectious diseases. Previous studies indicated that Actinobacillus pleuropneumoniae PalA is homologous to a Haemophilus influenzae protective antigen Hi-PAL (P6) protein. However, PalA protein adversely affects the Apx toxin-based subunit vaccine. In this study, we confirmed that recombinant PalA is immunogenic in animals. Mice immunized with bacterin and PalA (BacPal) showed significantly less antibodies against Apx toxins, relative to that of animals immunized with bacterin alone (Bac) before challenge...
August 22, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28820065/bcg-increased-membrane-expression-of-trim59-through-the-tlr2-tlr4-irf5-pathway-in-raw264-7-macrophages
#5
Jin Zheng, Tian Yuan, Yan Dongmei, Li Dong, Zhu Xun
OBJECTIVE: In our previous study, we showed that Bacillus Calmette-Guerin (BCG)-activated macrophages have the ability to directly kill tumor cells. One of the main properties of these macrophages is the high expression of tripartite motif family protein 59 (TRIM59). This study was conducted to investigate the mechanism of BCG-induced TRIM59 expression on macrophages and to identify the subcellular localization of TRIM59. METHODS: TRIM59 expression and TNF-α secretion were compared in RAW264...
August 18, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28820064/flow-cytometric-analysis-of-protein-aggregates
#6
Abhijit Chakrabarti, Sushanta Debnath, Bikram Nath
Misfolding of proteins often leads to aggregation. Accumulation of diverse protein aggregates in various cells, tissue and organs is the hallmark of many diseases, such as Alzheimer's disease and Parkinson's disease. In this report, we present a novel method of characterization of protein aggregates, associated with differential toxicity with different size and composition in vitro using flow cytometry. Autofluorescence and scattering intensities could distinguish between amyloid and non-amyloid aggregates...
August 18, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28820063/loss-in-toxic-function-of-aggregates-of-%C3%AE-synuclein-mutants-by-a-%C3%AE-synuclein-derived-peptide
#7
Soheila Mohammadi, Maryam Nikkhah, Saman Hosseinkhani
Parkinson's disease (PD) primarily results from a severe and selective damage of dopaminergic neurons. The neuropathological hallmark of the disease is the presence of inclusions known as Lewy bodies, that are enriched in α-Synuclein (αS) nanofibrils, within the surviving neurons. The inhibition of αS aggregation is considered as an efficient approach for preventing or treating PD. To date, several researchers have been focused on screening for the inhibitors that are able to block, slow down, or reverse αS aggregation, particularly at its early stages...
August 18, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28820062/urokinase-type-plasminogen-activator-and-the-molecular-mechanisms-of-its-regulation-in-cancer
#8
Juan Francisco Santibanez
Urokinase type plasminogen activator (uPA) is a 53-kDa serine protease initially synthesized as a catalytically inactive single chain polypeptide. Inactive-uPA is subject to proteolytic cleavage which results in the two-chain active protein. uPA plays key roles in the enhancement of cell malignancy during tumor progression. uPA is finely regulated in normal cells, but dysregulated in tumor cells, which results in increased cellular invasion capacities reflecting changes in uPA activity and expression during tumor progression...
August 18, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28820061/renin-angiotensin-system-and-cytokines-in-chronic-kidney-disease-clinical-and-experimental-evidence
#9
Ariadna Andrade Saldanha Silva, Beranardo Bahia Finotti, Amanda Oliveira Lauar, Thiago Ruiz Rodrigues Prestes, Ana Cristina Simões E Silva
Chronic kidney disease (CKD) has become a major public health problem in Brazil and worldwide. There are many causes of CKD, being the congenital anomalies of the kidney and urinary tract and the glomerular diseases very common in pediatric patients, while diabetic nephropathy, CKD due to chronic arterial hypertension and glomerular diseases are predominant in adult patients. Many endogenous mediators have been related to the pathophysiology of CKD, being relevant the effects of the renin-angiotensin system (RAS) and the immune-inflammatory mediators including cytokines...
August 18, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28820060/peptide-specificity-analysis-of-peptide-n-glycanases-using-synthetic-chitobiose-pentapeptides
#10
Taiki Kuribara, Toshihiro Ishihara, Takaya Kudo, Makoto Hirano, Kiichiro Totani
Peptide:N-glycanase is a deglycosylation enzyme releasing N-glycan from glycoproteins. Although glycan specificity analysis of this enzyme has been reported, recognition requirements for the peptide sequence have not been precisely elucidated. Therefore, in this study, we carried out peptide specificity analysis of several peptide:N-glycanases. Using synthetic chitobiose-pentapeptide substrates having a systematic series of amino acid sequences composed of hydrophobic leucine and hydrophilic serine, we examined the peptide specificities of peptide:N-glycanases comprising yeast cytoplasmic PNGase, bacterial PNGase F, and plant PNGase A by ultra-performance liquid chromatography combined with electrospray ionization mass spectrometry...
August 18, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28814250/angiotensin-converting-enzymes-ace-and-ace2-as-potential-targets-for-malignant-epithelial-neoplasia-review-and-bioinformatics-analyses-focused-in-oral-squamous-cell-carcinoma
#11
Carlos Alberto Carvalho Fraga, Lucyana Conceição Farias, Alfredo Maurício Batista de Paula, André Guimarães, Kimberly Marie Jones
The Renin-Angiotensin System (RAS) has emerged as being related to vascular disease. Recently the RAS has been associated with obesity, diabetes, and even cancer. This review focuses on the therapeutic potential of angiotensin converting enzyme (ACE) inhibitors for Oral Squamous Cell Carcinoma (OSCC). Considering the limited literature, Bioinformatics analyses was performed to identify possible effects of ACE inhibitors in OSCC. The current review intends to more fully explore the potential benefits of ACE inhibitors for OSCC patients...
August 15, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28799506/antibody-epitope-analysis-to-investigate-folded-structure-allosteric-conformation-and-evolutionary-lineage-of-proteins
#12
Sienna Wong, J-P Jin
Study of folded structure of proteins provides insights into their biological functions, conformational dynamics and molecular evolution. Current methods of elucidating folded structure of proteins are laborious, low-throughput, and constrained by various limitations. Arising from these methods is the need for a sensitive, quantitative, rapid and high-throughput method not only analyzing the folded structure of proteins, but also to monitor dynamic changes under physiological or experimental conditions. In this focused review, we outline the foundation and limitations of current protein structure-determination methods prior to discussing the advantages of an emerging antibody epitope analysis for applications in structural, conformational and evolutionary studies of proteins...
August 11, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28799505/single-molecular-level-probing-of-structure-and-dynamics-of-papain-under-denaturation
#13
Bhaswati Sengupta, Apala Chaudhury, Nilimesh Das, Pratik Sen
INTRODUCTION: Papain is a cysteine protease enzyme present in papaya and known to help in digesting peptide. Thus the structure and function of the active site of papain is of interest. OBJECTIVE: The objective of present study is to unveil the overall structural transformation and the local structural change around the active site of papain as a function of chemical denaturant. METHODS: Papain has been tagged at Cys-25 with a thiol specific fluorescence probe N-(7-dimethylamino-4-methylcoumarin-3-yl) iodoacetamide (DACIA)...
August 11, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28799504/glycan-phosphorylases-in-multi-enzyme-synthetic-processes
#14
Robert Field, Giulia Pergolizzi, Sakonwan Kuhaudomlarp, Eeshan Kalita
Glycoside phosphorylases catalyse the reversible synthesis of glycosidic bonds by glycosylation with concomitant release of inorganic phosphate. The equilibrium position of such reactions can render them of limited synthetic utility, unless coupled with a secondary enzymatic step where the reaction lies heavily in favour of product. This article surveys recent works on the combined use of glycan phosphorylases with other enzymes to achieve synthetically useful processes.
August 11, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28782479/candida-infections-and-human-defensins
#15
Vania Polesello, Ludovica Segat, Sergio Crovella, Luisa Zupin
Candida species infections are an important worldwide health issue since they do not only affect immunocompromised patients but also healthy individuals. Indeed Candida spp. are present as commensal flora in the host human body but they can switch into a pathological form inducing cellular damage and disease. Among Candida strains, C. albicans is the most prevalent in both mucosal and systemic infections. The host developed different mechanisms of protection against Candida infections; specifically the immune system and the innate immune response are the first line of defence...
August 7, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28782478/a-comparative-study-of-the-impact-of-calcium-ion-on-structure-aggregation-and-chaperone-function-of-human-%C3%AE-a-crystallin-and-its-cataract-causing-r12c-mutant
#16
Reza Yousefi, Sadaf Saba, Maryam Ghahramani
Several mutations in the genes encoding α-crystallin (α-Cry) subunits have been indicated to cause cataract diseases in human. Also, elevation in calcium level has been shown to induce aggregation of α-Cry which is accompanied with a significant reduction in its chaperone function. In some pathological conditions, the simultaneous incidence of α-Cry mutation and lens electrolyte imbalance might exacerbate the cataract phenotype. Therefore, in this study, the impact of calcium ion was investigated on structure, chaperone activity and amyloidogenic properties of the recombinant wild-type and mutant R12C αA-Cry, in a comparative study...
August 7, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28758598/synthetic-peptides-derived-from-ribosomal-proteins-of-leishmania-spp-in-mucocutaneous-leishmaniasis-diagnostic-usefulness
#17
Magda Melissa Florez, Camila Indiani de Oliveira, Concepción Puerta, Fanny Guzmán, Martha Ayala, Gladis Montoya, Gabriela Delgado
The serological diagnostic methods currently available for mucocutaneous leishmaniasis (MCL) lack specificity when complete parasites are used; however, such specificity increases when protein fractions are used. Ribosomal proteins have been reported to induce antibodies in animal and humans infected with the parasite, making them a worth candidate to assess its diagnosis potential. This study was thus aimed at evaluating synthetic peptides derived from Leishmania braziliensis ribosomal proteins S25 and S5 as antigen candidates for diagnosing MCL by ELISA; 4 of these 21 peptides (P4, P6, P19 and P21) had the greatest sensitivity (21...
July 28, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28758597/preterm-birth-and-renin-angiotensin-aldosterone-system-evidences-of-activation-and-impact-on-developmental-cardiovascular-disease-risks
#18
Mariane Bertagnolli
Preterm birth (< 37 gestational weeks) reaches 10% of total births worldwide. Early exposure to an ex utero environment can alter organogenesis and maturation in the newborn. This early onset of events can further promote long-term developmental alterations and cardiovascular disease risks. Mechanisms activated during preterm birth and promoting such cardiovascular alterations have just recently been investigated. As a major candidate, the renin angiotensin aldosterone system (RAAS) can be acutely altered during preterm birth and persistently activated in later life...
July 28, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28758596/effects-of-sleeve-gastrectomy-on-the-metabolic-profile-and-on-the-expression-of-renin-angiotensin-system-in-adipose-tissue-of-obese-rats
#19
Thaísa Soares Crespo, João Marcus Oliveira Andrade, Alanna Fernandes Paraíso, Deborah de Farias Lelis, Pablo Vinicyus Ferreira Chagas, Antônio Sérgio Barcala Jorge, Wagner Leite Ferreira, Alfredo Maurício Batista de Paula, André Luiz Sena Guimarães, Sérgio Henrique Sousa Santos
Sleeve gastrectomy (SG) has been used as a multipurpose surgical procedure for the treatment of obesity. The present study assessed the effects of SG on the metabolic and inflammatory profile and renin-angiotensin system (RAS) expression in the white adipose tissue of male rats with obesity induced by a high-fat diet. Male Wistar rats were treated with a standard diet or high-fat diet and submitted to SG or sham surgery. The glycemic and lipid profiles and gene expression of inflammatory markers and RAS components in adipose tissue were evaluated...
July 28, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28758595/vasodilator-effect-of-angiotensin-1-7-on-vascular-coronary-bed-of-rats-role-of-mas-ace-and-ace2
#20
Patrícia Lanza Moraes, Lucas Miranda Kangussu, Carlos Henrique Castro, Robson As Santos, Anderson José Ferreira, Alvair P Almeida
Angiotensin(Ang)-(1-7) is a biologically active member of the renin-angiotensin system that participates of the regulation of blood pressure. Although Ang-(1-7) is able to potentiate the vasodilator effect of bradykinin in coronary bed of rats, a direct vasodilator effect of Ang-(1-7) in this vascular bed has not been characterized. Thus, the aim of this study was to evaluate the mechanisms involved in the vasodilator effect of Ang-(1-7) in the vasculature of isolated rat hearts perfused according to the Langendorff technique at constant flow...
July 28, 2017: Protein and Peptide Letters
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