scholarly journals DING Proteins Extend to the Extremophilic World

2021 ◽  
Vol 22 (4) ◽  
pp. 2035
Author(s):  
Elena Porzio ◽  
Maria Rosaria Faraone Mennella ◽  
Giuseppe Manco

The DING proteins are ubiquitous in the three domains of life, from mesophiles to thermo- and hyperthermophiles. They belong to a family of more than sixty members and have a characteristic N-terminus, DINGGG, which is considered a “signature” of these proteins. Structurally, they share a highly conserved phosphate binding site, and a three dimensional organization resembling the “Venus Flytrap”, both reminding the ones of PstS proteins. They have unusually high sequence conservation, even between distantly related species. Nevertheless despite that the genomes of most of these species have been sequenced, the DING gene has not been reported for all the relative characterized DING proteins. Identity of known DING proteins has been confirmed immunologically and, in some cases, by N-terminal sequence analysis. Only a few of the DING proteins have been purified and biochemically characterized. DING proteins are heterogeneous for their wide range of biological activities and some show different activities not always correlated with each other. Most of them have been originally identified for different biological properties, or rather for binding to phosphate and also to other ligands. Their involvement in pathologies is described. This review is an update of the most recent findings on old and new DING proteins.

2020 ◽  
Vol 89 (1) ◽  
pp. 695-715
Author(s):  
Eveline S. Litscher ◽  
Paul M. Wassarman

The zona pellucida (ZP) is an extracellular matrix that surrounds all mammalian oocytes, eggs, and early embryos and plays vital roles during oogenesis, fertilization, and preimplantation development. The ZP is composed of three or four glycosylated proteins, ZP1–4, that are synthesized, processed, secreted, and assembled into long, cross-linked fibrils by growing oocytes. ZP proteins have an immunoglobulin-like three-dimensional structure and a ZP domain that consists of two subdomains, ZP-N and ZP-C, with ZP-N of ZP2 and ZP3 required for fibril assembly. A ZP2–ZP3 dimer is located periodically along ZP fibrils that are cross-linked by ZP1, a protein with a proline-rich N terminus. Fibrils in the inner and outer regions of the ZP are oriented perpendicular and parallel to the oolemma, respectively, giving the ZP a multilayered appearance. Upon fertilization of eggs, modification of ZP2 and ZP3 results in changes in the ZP's physical and biological properties that have important consequences. Certain structural features of ZP proteins suggest that they may be amyloid-like proteins.


Author(s):  
Nieves Baenas ◽  
Jenny Ruales ◽  
Diego A. Moreno ◽  
Daniel Alejandro Barrio ◽  
Carla M. Stinco ◽  
...  

Andean blueberries are wild berries grown and consumed in Ecuador which contain high values of bioactive compounds, mainly anthocyanins, with powerful antioxidant activity. The aim of this study was to evaluate the profile and contents of (poly)phenols and carotenoids in Andean blueberry by HPLC-DAD-MSn and determine a wide range of its biological activities. The antioxidant capacity of this fruit was evaluated in vitro by three different methods and in vivo using the zebrafish animal model, also the toxicity effect was determined by the zebrafish embryogenesis test. Besides, the antimicrobial activity and the capacity of Andean blueberry to produce hemagglutination in blood cells were evaluated. Finally, the bioaccessibility of (poly)phenols and related antioxidant capacity were determined in the different phases of an in vitro digestion. The global results indicated no toxicity of Andean blueberry, weakly bacteriostatic activity, and high contents of anthocyanins and antioxidant capacity, which were partially bioaccesible in vitro (~ 50 % at the final intestinal step), contributing to the knowledge of its health benefits for consumers and its potential use in the food and pharmaceutical industry as functional ingredient.


2018 ◽  
Vol 22 (6) ◽  
pp. 667-675 ◽  
Author(s):  
T. I. Odintsova ◽  
M. P. Slezina ◽  
E. A. Istomina

Antimicrobial peptides (AMPs) are important components of defense system in both plants and animals. They represent an ancient mechanism of innate immunity providing rapid first line of defense against pathogens. Plant AMPs are classified into several families: thionins, defensins, nonspecific lipid-transfer proteins, hevein- and knottin-type peptides, hairpinins and macrocyclic peptides (cyclotides). The review focuses on the thionin family. Thionins comprise a plant-specific AMP family that consists of short (~5 kDA) cysteine-rich peptides containing 6 or 8 cysteine residues with antimicrobial and toxic properties. Based on similarity in amino acid sequences and the arrangement of disulphide bonds, five structural classes of thionins are discriminated. The three-dimensional structures of a number of thionins were determined. The amphipathic thionin molecule resembles the Greek letter Г, in which the long arm is formed by two antiparallel α-helices, while the short one, by two parallel β-strands. The residues responsible for the antimicrobial activity of thionins were identified. Thionins are synthesized as precursor proteins consisting of a signal peptide, the mature peptide region and the C-terminal prodomain. Thionins protect plants from pathogenic bacteria and fungi acting directly on the membranes of microorganisms at micromolar concentrations, although their precise mode of action remains unclear. In addition to plant pathogens, thionins inhibit growth of a number of human pathogens and opportunistic microorganisms, such as Candida spp., Saccharomyces cerevisiae, Fusarium solani, Staphylococcus aureus and Escherichia coli. Thionins are toxic to different types of cells including mammalian cancer cell lines. Transgenic plants expressing thionin genes display enhanced resistance to pathogens. A wide range of biological activities makes thionins promising candidates for practical application in agriculture and medicine.


1991 ◽  
Vol 277 (1) ◽  
pp. 39-45 ◽  
Author(s):  
D Carré-Eusèbe ◽  
F Lederer ◽  
K H D Lê ◽  
S M Elsevier

Protamine P2, the major basic chromosomal protein of mouse spermatozoa, is synthesized as a precursor almost twice as long as the mature protein, its extra length arising from an N-terminal extension of 44 amino acid residues. This precursor is integrated into chromatin of spermatids, and the extension is processed during chromatin condensation in the haploid cells. We have studied processing in the mouse and have identified two intermediates generated by proteolytic cleavage of the precursor. H.p.l.c. separated protamine P2 from four other spermatid proteins, including the precursor and three proteins known to possess physiological characteristics expected of processing intermediates. Peptide mapping indicated that all of these proteins were structurally similar. Two major proteins were further purified by PAGE, transferred to poly(vinylidene difluoride) membranes and submitted to automated N-terminal sequence analysis. Both sequences were found within the deduced sequence of the precursor extension. The N-terminus of the larger intermediate, PP2C, was Gly-12, whereas the N-terminus of the smaller, PP2D, was His-21. Both processing sites involved a peptide bond in which the carbonyl function was contributed by an acidic amino acid.


2008 ◽  
Vol 3 (4) ◽  
pp. 1934578X0800300 ◽  
Author(s):  
Alejandro F. Barrero ◽  
M. Mar Herrador ◽  
Pilar Arteaga ◽  
Julieta V. Catalán

Germacrone (1) forms part of a great number of essential oils, in some of them comprising more than 20% of the total oil. This compound presents a wide range of biological activities (CNS depressant, antiinflammatory, antiulcer, antifeedant, antibacterial, antifungal, antitumor, antitussive, vasodilator, choleretic, hepatoprotector), which are analyzed. The chemical reactivity of germacrone, including cyclization reactions, and complete synthesis are presented.


Antioxidants ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 962
Author(s):  
Rengasamy Balakrishnan ◽  
Duk-Yeon Cho ◽  
In Su-Kim ◽  
Dong-Kug Choi

The Dendropanax genus is a kind of flowering plant in the family of Araliaceae that encompasses approximately 91 to 95 species. Several Dendropanax species are used as traditional medicinal plants, extensively used Korea and South America and other parts of the world. Almost every part of the plant, including the leaves, bark, roots, and stems, can be used as traditional medicine for the prevention and management of a broad spectrum of health disorders. This paper sought to summarizes the ethnopharmacological benefits, biological activities, and phytochemical investigations of plants from the genus Dendropanax, and perhaps to subsequently elucidate potential new perspectives for future pharmacological research to consider. Modern scientific literature suggests that plants of the Dendropanax genus, together with active compounds isolated from it, possess a wide range of therapeutic and pharmacological applications, including antifungal, anti-complement, antioxidant, antibacterial, insect antifeedant, cytotoxic, anti-inflammatory, neuroprotective, anti-diabetic, anti-cancer, and anti-hypouricemic properties. The botanical descriptions of approximately six to 10 species are provided by different scientific web sources. However, only six species, namely, D. morbiferus, D. gonatopodus, D. dentiger, D. capillaris, D. chevalieri, and D. arboreus, were included in the present investigation to undergo phytochemical evaluation, due to the unavailability of data for the remaining species. Among these plant species, a high concentration of variable bioactive ingredients was identified. In particular, D. morbifera is a traditional medicinal plant used for the multiple treatment purposes and management of several human diseases or health conditions. Previous experimental evidence supports that the D. morbifera species could be used to treat various inflammatory disorders, diarrhea, diabetes, cancer, and some microbial infections. It has recently been reported, by our group and other researchers, that D. morbifera possesses a neuroprotective and memory-enhancing agent. A total of 259 compounds have been identified among six species, with 78 sourced from five of these species reported to be bioactive. However, there is no up-to-date information concerning the D. morbifera, its different biological properties, or its prospective benefits in the enhancement of human health. In the present study, we set out to conduct a comprehensive analysis of the botany, traditional medicinal history, and medicinal resources of species of the Dendropanax genus. In addition, we explore several phytochemical constituents identified in different species of the Dendropanax genus and their biological properties. Finally, we offer comprehensive analysis findings of the phytochemistry, medicinal uses, pharmacological actions, and a toxicity and safety evaluation of the D. morbifera species and its main bioactive ingredients for future consideration.


2019 ◽  
Vol 16 (33) ◽  
pp. 524-529
Author(s):  
G E DELGADO ◽  
P DELGADO-NIÑO ◽  
R LOBATON ◽  
S-M LIEW ◽  
J JAMALIS

Pyrazolines are important agents in medicinal chemistry as a promising scaffold for structural modification and drug development studies due to their wide range of biological activities such as anticancer, antifungal, antibacterial, antidepressant, anticonvulsant, antitubercular, antioxidant, antileishmanial and antiinflammatory activity. These heterocyclic compounds can be prepared by refluxing chalcone with hydrazine hydrate and anhydrous sodium acetate in the presence of glacial acetic acid. The structural characterization, molecular and crystalline structure, of these organic compounds, allows studying their biological properties to know their potential applications. Hence the use of XRPD is very important because it allows obtaining a record to be used as a method of identification. The aim of this investigation was to obtain and reported good quality Xray powder diffraction data the pyrazoline compound 1-(3-(4-iodophenyl)-5-(3-methyl thiophen-2-yl)-4,5-dihydro-1H-pyrazol-1-yl)ethan-1-one, which could be used as potential anti-microbial and anti-cancer agent. The powder pattern was indexed in the monoclinic space group I2/a with unit cell parameters a = 25.440(5) Å, b = 5.124(2) Å, c = 26.261(6) Å, b = 105.75(2)° and figures of merit M20= 38.2 and F20= 66.6 (0.00573, 53). All measured lines were indexed and are consistent with the monoclinic space group. The powder pattern will be included in the Powder Diffraction File database to be used as a reference.


PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0257071
Author(s):  
Ghada Mahmoud Abdelwahab ◽  
Amira Mira ◽  
Yuan-Bin Cheng ◽  
Tarek A. Abdelaziz ◽  
Mohamed Farid I. Lahloub ◽  
...  

Aspergillus niger metabolites exhibited a wide range of biological properties including antioxidant and neuro-protective effects and some physical properties as green synthesis of silver nanoparticles AgNP. The present study presents a novel evidence for the various biological activities of green synthesized AgNPs. For the first time, some isolated naphtho-γ-pyrones from marine-derived Aspergillus niger, flavasperone (1), rubrofusarin B (2), aurasperone A (3), fonsecinone A (4) in addition to one alkaloid aspernigrin A (7) were invistigated for their inhibitory activity of acetylcholine esterase AChE, a hallmark of Alzheimer’s disease (AD). The ability to synthesize AgNPs by compounds 3, 4 and 7 has been also tested for the first time. Green synthesized AgNPs were well-dispersed, and their size was ranging from 8–30 nm in diameter, their morphology was obviously spherical capped with the organic compounds. Further biological evaluation of their AChE inhibitory activity was compared to the parent compounds. AgNps dramatically increased the inhibitory activity of Compounds 4, 3 and 7 by 84, 16 and 13 fold, respectively to be more potent than galanthamine as a positive control with IC50 value of 1.43 compared to 0.089, 0.311 and 1.53 of AgNPs of Compounds 4, 3 and 7, respectively. Also compound 2 showed moderate inhibitory activity. This is could be probably explained by closer fitting to the active sites or the synergistic effect of the stabilized AgNPs by the organic compouds. These results, in addition to other intrinsic chemical and biological properties of naphtho-γ-pyrones, suggest that the latter could be further explored with a view towards other neuroprotective studies for alleviating AD.


2016 ◽  
Vol 72 (9) ◽  
pp. 670-678 ◽  
Author(s):  
Tholappanavara H. Suresha Kumara ◽  
Gopalpur Nagendrappa ◽  
Nanjappa Chandrika ◽  
Haliwana B. V. Sowmya ◽  
Manpreet Kaur ◽  
...  

Hydrazone derivatives exhibit a wide range of biological activities, while pyrazolo[3,4-b]quinoline derivatives, on the other hand, exhibit both antimicrobial and antiviral activity, so that all new derivatives in these chemical classes are potentially of value. Dry grinding of a mixture of 2-chloroquinoline-3-carbaldehyde and 4-methylphenylhydrazinium chloride gives (E)-1-[(2-chloroquinolin-3-yl)methylidene]-2-(4-methylphenyl)hydrazine, C17H14ClN3, (I), while the same regents in methanol in the presence of sodium cyanoborohydride give 1-(4-methylphenyl)-4,9-dihydro-1H-pyrazolo[3,4-b]quinoline, C17H15N3, (II). The reactions between phenylhydrazinium chloride and either 2-chloroquinoline-3-carbaldehyde or 2-chloro-6-methylquinoline-3-carbaldehyde give, respectively, 1-phenyl-1H-pyrazolo[3,4-b]quinoline, C16H11N3, (III), which crystallizes in the space groupPbcnas a nonmerohedral twin havingZ′ = 3, or 6-methyl-1-phenyl-1H-pyrazolo[3,4-b]quinoline, C17H13N3, (IV), which crystallizes in the space groupR\overline{3}. The molecules of compound (I) are linked into sheets by a combination of N—H...N and C—H...π(arene) hydrogen bonds, and the molecules of compound (II) are linked by a combination of N—H...N and C—H...π(arene) hydrogen bonds to form a chain of rings. In the structure of compound (III), one of the three independent molecules forms chains generated by C—H...π(arene) hydrogen bonds, with a second type of molecule linked to the chains by a second C—H...π(arene) hydrogen bond and the third type of molecule linked to the chain by multiple π–π stacking interactions. A single C—H...π(arene) hydrogen bond links the molecules of compound (IV) into cyclic centrosymmetric hexamers having \overline{3} (S6) symmetry, which are themselves linked into a three-dimensional array by π–π stacking interactions.


2021 ◽  
Vol 28 ◽  
Author(s):  
Kazuhiro Haraguchi ◽  
Hiroki Kumamoto ◽  
Hiromichi Tanaka

: The first highly diastereoselective synthesis of -anomers of 4’-thionucleosides has been carried out by means of electrophilic glycosidation utilizing 3,5-O-(di-t-butylsilylene) (DTBS)-4-thiofuranoid glycal as a glycosyl donor. The resulting glycosides were transformed into ribo-, 2’-deoxy- and arabinofuranosyl nucleosides through a chemical transformation of the 2’-substituent. The additive Pummerer reaction of the glycal S-oxide gave 1,2-di-O-acetyl-3,5-O-DTBS-4-thioribofuranose. The utility of the DTBS-protected 4-thioribofuranose has been demonstrated by the preparation of 4’-thio analogues of pyrimidine- and purine-4’-thioribonucleosides on the basis of the Vorbrüggen glycosidation. Synthesis of 4’-thio-counterpart of C-nucleoside antibiotic tiazofurin has also been carried out. -Face selective hydroboration of 1-C-aryl- or 1-C-heteroaryl-glycals obtained by cross-coupling of 1-tributylstannylglycal has furnished the respective -anomer of 4’-thio-C-ribonucleosides including 4’-thio analogue of nucleoside antibiotic pseudouridine and 9-deazaadenosine. On the basis of lithiation chemistry, 1-C- and 2-C-carbon-carbon-substituted 3,5-O-(1,1,3,3-tetraisopropyldisiloxane-1,3- diyl) (TIPDS)- 4-thiofuranoid glycal were synthesized. These glycals enabled us to prepare 1’-C- and 2’--C-carbon-substituted 2’-deoxy-4’-thionucleosides which include thio-counterpart of antitumor nucleoside antibiotic angustmycin C. Furthermore, 1’-C-methyl-4’-thiothymidine emerged as potent inhibitor of angiogenesis. In addition, 1’-C-methyl-4’-thiothymidine exhibited inhibitory activity against thymidine kinase deficient mutant of herpes virus more potent than that of ganciclovir. Among the 4’-substituted 4’-thiothymidines, the 4’-C-cyano- and 4’-C-ethynyl derivatives inhibited replication of HIV variant resistant to 3TC (HIVM184V) as potent as to those of the HIV-1IIIB. In terms of the value of selectivity index (SI), 4’-C-cyano-4’-thiothymidine showed 3-fold selective index (SI) than that of the corresponding thymidine derivative. Furthermore, 4’-C-ethynyl-2’-deoxy-4’-thioguanosine has a 20-fold better value (>18,200) than that of 2’-deoxyguanosine counterpart (933). Furthermore,4’-azido-4’-thiothymidine was emerged as selective and potent anti-EBV agent. In terms of antineoplastic activity, 4’-azido- and 4’-C-fluoromethyl-2’-deoxy-4’-thiocytidine inhibited proliferation of human B-cell (CCRF-SB) and T-cell leukemia (Molt-4) cell lines although the parent compound 2’-deoxy-4’-thiocytidine did not show any cytotoxicity up to 100 M. These facts concerning the biological activities suggested that replacement of the furanose oxygen with sulfur atom is a promising approach for development of less toxic antiviral and antineoplastic nucleoside antimetabolites. 4’-Thionucleoside has also superior biological properties as monomer for oligonucleotides (ONs) therapeutics. Therefore, this review provides a wide range of potential monomer for antisense ON and siRNA.


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