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Caixia Wang, Yuqiu Ye, Chunyong Liu, Yongming Zhou, Linsheng Lv, Cailian Cheng, Shaomin Li, Tanqi Lou, Xun Liu
BACKGROUND: Evening dosing regimen drug therapy on blood pressure (BP) control is used widely, but its clinical benefits and preservation or re-establishment of normal 24-hour BP dipping pattern in chronic kidney disease (CKD) patients is not known. AIMS: To investigate the effect of evening dosing regimen of antihypertensive drugs on blood pressure patterns to CKD patients with hypertension. METHODS: We did a systematic review by searching PUBMED, EMBASE, ASN-ONLINE, the Cochrane Library and the reference lists of relevant articles of published papers...
May 24, 2017: Internal Medicine Journal
Chunxi Liu, Tingxian Liu, Xiaoyue Yu, Yizhu Gu
Previously developed Asn-Gly-Arg (NGR) peptide-modified multifunctional poly(ethyleneimine)-poly(ethylene glycol) (PEI-PEG)-based nanoparticles (TPIC) have been considered to be promising carriers for the co-delivery of DNA and doxorubicin (DOX). As a continued effort, the aim of the present study was to further evaluate the interaction between TPIC and human umbilical vein endothelial cells (HUVEC) to better understand the cellular entry mechanism. In the present investigation, experiments relevant to co-localization, endocytosis inhibitors and factors influencing the internalization were performed...
May 2017: Acta Pharmaceutica Sinica. B
Yu-Xing Lu, Xin-Xin Liu, Wei-Bin Liu, Bang-Ce Ye
One hundred and fifty GCN5-like acetyltransferases with amino acid-binding (ACT)-GCN5-related N- acetyltransferase (GNAT) domain organization have been identified in actinobacteria. The ACT domain is fused to the GNAT domain, conferring amino acid-induced allosteric regulation to these protein acetyltransferases (AAPatA). Members of the AAPatA family share similar secondary structure and are divided into two groups based on the allosteric ligands of the ACT domain: the asparagine-activated PatA and the cysteine-activated PatA...
May 24, 2017: Bioscience Reports
Paul Staswick, Martha Rowe, Edgar P Spalding, Bessie L Splitt
Amide-linked conjugates between tryptophan (Trp) and jasmonic (JA) or indole-3-acetic (IAA) acids interfered with gravitropism and other auxin-dependent activities in Arabidopsis, but the mechanism was unclear. To identify structural features necessary for activity several additional Trp conjugates were synthesized. The phenylacetic acid (PAA) conjugate was active, while several others were not. Common features of active conjugates is that they have ring structures that are linked to Trp through an acetic acid side chain, while longer or shorter linkages are inactive or less active...
2017: Frontiers in Plant Science
Luisa A Scudeller, Selvi Srinivasan, Alexandre M Rossi, Patrick S Stayton, Gary P Drobny, David G Castner
Adsorption isotherms, circular dichroism (CD) spectroscopy, x-ray photoelectron spectroscopy (XPS), and time-of-flight secondary ion mass spectrometry (ToF-SIMS) were used to investigate the adsorption of human osteocalcin (hOC) and decarboxylated (i.e., Gla converted back to Glu) hOC (dhOC) onto various calcium phosphate surfaces as well as silica surfaces. The adsorption isotherms and XPS nitrogen signals were used to track the amount of adsorbed hOC and dhOC. The intensities of key ToF-SIMS amino acid fragments were used to assess changes in the structure of adsorbed hOC and dhOC...
May 18, 2017: Biointerphases
Anna Wilkaniec, Magdalena Gąssowska, Grzegorz A Czapski, Magdalena Cieślik, Grzegorz Sulkowski, Agata Adamczyk
Abnormalities of alpha-synuclein (ASN), the main component of protein deposits (Lewy bodies), were observed in Parkinson's disease (PD), dementia with Lewy bodies, Alzheimer's disease, and other neurodegenerative disorders. These alterations include increase in the levels of soluble ASN oligomers in the extracellular space. Numerous works have identified several mechanisms of their toxicity, including stimulation of the microglial P2X7 receptor leading to oxidative stress. While the significant role of purinergic signaling-particularly, P2 family receptors-in neurodegenerative disorders is well known, the interaction of extracellular soluble ASN with neuronal purinergic receptors is yet to be studied...
May 17, 2017: Purinergic Signalling
Basab Roy, Zheng Zuo, Gary D Stormo
The quantitative specificity of the STAT1 transcription factor was determined by measuring the relative affinity to hundreds of variants of the consensus binding site including variations in the length of the site. The known consensus sequence is observed to have the highest affinity, with all variants decreasing binding affinity considerably. There is very little loss of binding affinity when the CpG within the consensus binding site is methylated. Additionally, the specificity of mutant proteins, with variants of amino acids that interact with the DNA, was determined and nearly all of them are observed to lose specificity across the entire binding site...
May 16, 2017: Nucleic Acids Research
Daisuke Fujinami, Yuya Taguchi, Daisuke Kohda
Pyrobaculum calidifontis is a hyperthermophilic archaeon that belongs to the phylum Crenarchaeota. In contrast to the phylum Euryarchaeota, only the N-glycan structure of the genus Sulfolobus is known in Crenarchaeota. Here, we enriched glycoproteins from cultured P. calidifontis cells, by ConA lectin chromatography. The MASCOT search identified proteins with at least one potential N-glycosylation site. The MS/MS analysis of twelve small tryptic glycopeptides confirmed the canonical N-glycosylation consensus in P...
May 16, 2017: Glycobiology
Xiaolin Gao, Jian Yan, Jianhua Lu
In airborne sensor networks (ASNs), the media access control (MAC) protocol faces a serious unfairness problem due to the traditional protection mechanism of air-to-air communications among aircraft. Actually, by using the binary exponential back-off algorithm at high traffic loads to minimize collisions among users, the latest successful node can always benefit from this kind of MAC to obtain channel resources. Moreover, when taking the existence of the hidden nodes in ASNs into account, the inaccurate traffic load information will further aggravate the system's unfairness...
May 16, 2017: Sensors
Monika Schmidt, David Konieczny, Eugenia V Peresypkina, Alexander V Virovets, Gabor Balázs, Michael Bodensteiner, Felix Riedlberger, Hannes Krauss, Manfred Scheer
The redox chemistry of [Cp*Fe(η(5) -As5 )] (1, Cp*=η(5) -C5 Me5 ) has been investigated by cyclic voltammetry, revealing a redox behavior similar to that of its lighter congener [Cp*Fe(η(5) -P5 )]. However, the subsequent chemical reduction of 1 by KH led to the formation of a mixture of novel Asn scaffolds with n up to 18 that are stabilized only by [Cp*Fe] fragments. These include the arsenic-poor triple-decker complex [K(dme)2 ][{Cp*Fe(μ,η(2:2) -As2 )}2 ] (2) and the arsenic-rich complexes [K(dme)3 ]2 [(Cp*Fe)2 (μ,η(4:4) -As10 )] (3), [K(dme)2 ]2 [(Cp*Fe)2 (μ,η(2:2:2:2) -As14 )] (4), and [K(dme)3 ]2 [(Cp*Fe)4 (μ4 ,η(4:3:3:2:2:1:1) -As18 )] (5)...
May 16, 2017: Angewandte Chemie
Arnaud Baslé, Semeli Platsaki, Christopher Dennison
Bacteria possess cytosolic proteins (Csp3s) capable of binding large quantities of copper and preventing toxicity. Crystal structures of a Csp3 plus increasing amounts of Cu(I) provide atomic-level information about how a storage protein loads with metal ions. Many more sites are occupied than Cu(I) equivalents added, with binding by twelve central sites dominating. These initially form three [Cu4(S-Cys)4] intermediates leading to [Cu4(S-Cys)5]-, [Cu4(S-Cys)6]2-, and [Cu4(S-Cys)5(O-Asn)]- clusters. Construction of the five Cu(I) sites at the opening of the bundle lags behind the main core, and the two least accessible sites are occupied last...
May 15, 2017: Angewandte Chemie
Peterson Wambugu, Marie-Noelle Ndjiondjop, Agnelo Furtado, Robert Henry
Amylose content (AC) is a key quality trait in rice. A cross between Oryza glaberrima (African rice) and Oryza sativa (Asian rice) segregating for AC was analyzed by sequencing bulks of individuals with high and low AC. SNP associated with the granule bound starch synthase (GBSS1) locus on chromosome 6 were polymorphic between the bulks. In particular a G/A SNP that would result in an Asp to Asn mutation was identified. This amino acid substitution may be responsible for differences in GBSS activity as it is adjacent to a disulphide linkage conserved in all grass GBSS proteins...
May 12, 2017: Plant Biotechnology Journal
Hanliu Wang, Qin Shu, Carl Frieden, Michael L Gross
Non-enzymatic deamidation of asparagine and glutamine in peptides and proteins is a frequent modification both in vivo and in vitro. The biological effect is not completely understood, but it is often associated with protein degradation and loss of biological function. Here we describe the deamidation of CsgA, the major protein subunit of curli, which are important proteinaceous components of biofilms. CsgA has a high content of Asn and Gln, a feature seen in other proteins that self-aggregate. We have implemented an approach to monitor deamidation rapidly by following the globally centroid mass shift, providing guidance for studies at the residue level...
May 12, 2017: Biochemistry
Kuo-Yuan Hung, Paul W R Harris, Ami Desai, John F Marshall, Margaret A Brimble
The 20-residue linear peptide A20FMDV2 has been shown to exhibit high selectivity and affinity for the tumour-related αvβ6 integrin and has potential as a vector for therapeutic drugs. However, it exhibits poor half-life in plasma in part due to its high susceptibility to serum proteases. In this study fourteen A20FMDV2 analogues incorporating non-proteinogenic substitutes of the native Lys16 and Leu13 residues and six A20FMDV2 analogues containing modified N- and C-termini were synthesised to increase the half-life and activity of A20FMDV2...
May 3, 2017: European Journal of Medicinal Chemistry
Ji-Hye Lee, Ji-Eun Lee, Kyung-Jung Kang, Young-Joo Jang
Fibroblast growth factor (FGF) is a multifunctional growth factor that induces cell proliferation, survival, migration, and differentiation in various cell types and tissues. With these biological functions, FGF-2 has been evaluated for clinical use in the regeneration of damaged tissues. The expression of hFGF-2 in Escherichia coli and a purification system using the immobilized metal affinity chromatography (IMAC) is well established to generate a continuous supply of FGF-2. Although hexa-histidine tag (H6) is commonly used for IMAC purification, hexa-histidine-asparagine tag (HN6) is also efficient for purification as it is easily exposed on the surface of the protein...
May 6, 2017: Protein Expression and Purification
Takeshi Uchida, Nobuhiko Dojun, Yukari Sekine, Koichiro Ishimori
HutZ from Vibrio cholerae is an enzyme that catalyzes the oxygen-dependent degradation of heme. The crystal structure of the homologous protein from Helicobacter pylori, HugZ, predicts that Asp132 in HutZ is located within hydrogen-bonding distance of the heme axial ligand His170. Hydrogen bonding between His170 and Asp132 appears to be disfavored in heme-degrading enzymes, because it can contribute to the imidazolate character of the axial histidine, as observed in most heme-containing peroxidases. Thus, we investigated the role of this potential hydrogen bond in the heme degradation reaction by mutating Asp132 to Leu, Asn, or Glu and by mutating His170 to Ala...
May 11, 2017: Biochemistry
Guanying Wang, Na Yuan, Shangke Huang, Lu Feng, Rui Han, Yujiao Zhang, Juan Ren, Min Meng, Xinhan Zhao
Fibrinogen Asn-Gly-Arg motif can specifically recognize and bind to Aminopeptidase N (CD13) on vascular endothelial cells in newly formed tumor vessels. Adipose-derived stem cells can serve as ideal vectors for gene therapy because of their ability of migrating to tumor tissues. First, this study was aimed to design a new peptide (CNGRCLLII(KLAKLAK)2) named CNAK which contains cyclic Asn-Gly-Arg motif and test its biological activity against human umbilical vein endothelial cells. Second, we aimed to construct stably transfected adipose-derived stem cells which express the CNAK peptide and investigate their anti-angiogenic activity in vivo...
May 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
Katharina Schmölzer, Manuel Eibinger, Bernd Nidetzky
Sialyltransferases of glycosyltransferase family GT-80 are considered as multifunctional due to an array of activities detected. They exhibit glycosyl transfer, trans-sialylation and hydrolysis activities. How these enzymes utilize their active-site residues in balancing the different enzymatic activities is not well understood. In this study of Pasteurella dagmatis α2,3-sialyltransferase, we show that the conserved His85 controls efficiency and selectivity of the sialyl transfer. A His85→Asn variant was 200-fold less efficient than the wild type for sialylation of lactose and exhibited relaxed site selectivity to form not only α2,3 but also α2,6-sialylated product (21%)...
May 5, 2017: Chembiochem: a European Journal of Chemical Biology
Anjaneya S Ravipati, Aaron G Poth, Sónia Troeira Henriques, Murari Bhandari, Yen-Hua Huang, Jaime Nino, Michelle L Colgrave, David J Craik
Cyclotides are a large family of naturally occurring plant-derived macrocyclic cystine-knot peptides, with more than 400 having been identified in species from the Violaceae, Rubiaceae, Cucurbitaceae, Fabaceae, and Solanaceae families. Nevertheless, their specialized distribution within the plant kingdom remains poorly understood. In this study, the diversity of cyclotides was explored through the screening of 197 plants belonging to 43 different families. In total, 28 cyclotides were sequenced from 15 plant species, one of which belonged to the Rubiaceae and 14 to the Violaceae...
May 4, 2017: Journal of Natural Products
Tomomitsu Hatakeyama, Ayaka Ichise, Hideaki Unno, Shuichiro Goda, Tatsuya Oda, Hiroaki Tateno, Jun Hirabayashi, Hitomi Sakai, Hideyuki Nakagawa
The globiferous pedicellariae of the venomous sea urchin Toxopneustes pileolus contains several biologically active proteins. We have cloned the cDNA of one of the toxin components, SUL-I, which is a rhamnose-binding lectin that acts as a mitogen through binding to carbohydrate chains on target cells. Recombinant SUL-I (rSUL-I) was produced in Escherichia coli cells, and its carbohydrate-binding specificity was examined with the glycoconjugate microarray analysis, which suggested that potential target carbohydrate structures are galactose-terminated N-glycans...
May 3, 2017: Protein Science: a Publication of the Protein Society
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