PubAg

Main content area

You searched for: Subject "proline" Remove constraint Subject: "proline"
Start Over

Search

8,120  Search Results

« Previous | 1 - 20 of 8,120 |
Number of results to display per page

Search Results

1. Correction to: The expression of proline production/degradation genes under salinity and cadmium stresses in Triticum aestivum inoculated with Pseudomonas sp.

Author:
Shavalikohshori, O.; Zalaghi, R.; Sorkheh, K.; Enayatizamir, N.
Source:
International journal of environmental science and technology 2020 v.17 no.4 pp. 2243
ISSN:
1735-1472
Subject:
proline,   etc   ; Pseudomonas; Triticum aestivum; cadmium; genes; salinity;     Show all 6 Subjects
Abstract:
... The article listed above was initially published with incorrect author name for N. Enayatizamir. Through this correction, it is corrected. ...
DOI:
10.1007/s13762-019-02560-8

2. Synthesis of trifluoromethyl and trifluoroacetyl substituted dihydropyrrolizines and tetrahydroindolizines

Author:
Klipkov, Anton A.; Sorochinsky, Alexander E.; Tarasenko, Karen V.; Rusanova, Julia A.; Gerus, Igor I.
Source:
Tetrahedron letters 2020 v.61 no.12 pp. 151633
ISSN:
0040-4039
Subject:
proline,   etc   ; anhydrides; chemical reactions; moieties; pipecolic acid; pyrroles;     Show all 6 Subjects
Abstract:
... The trifluoroacetic anhydride promoted cyclization of enaminones derived from proline or pipecolic acid and β-ethoxyvinyl trifluoromethyl ketone was reinvestigated. An operationally simple procedure for the selective synthesis of bicyclic trifluoromethylated pyrroles and bicyclic pyrroles bearing trifluoromethyl and trifluoroacetyl groups on the pyrrole ring was developed. The mechanism of cycliza ...
DOI:
10.1016/j.tetlet.2020.151633

3. Highly Reversible and Efficient Absorption of Low-Concentration NO by Amino-Acid-Based Ionic Liquids

Author:
Sun, Ying; Ren, Shuhang; Hou, Yucui; Zhang, Kai; Zhang, Qi; Wu, Weize
Source:
ACS sustainable chemistry & engineering 2020 v.8 no.8 pp. 3283-3290
ISSN:
2168-0485
Subject:
proline,   etc   ; absorption; ambient pressure; choline; ionic liquids; secondary amines;     Show all 6 Subjects
Abstract:
... A series of environmentally benign functional ionic liquids (ILs) based on l-proline as the anion to efficiently absorb low-concentration NO have been investigated in this work. The results indicate that the ILs with an l-proline anion have high absorption capacities for 0.16 vol % NO, reaching a maximum absorption capacity of 0.51 mol of NO per mol of IL at 30 °C and ambient pressure for l-prolin ...
DOI:
10.1021/acssuschemeng.9b06923

4. The importance of definitions in the study of polyQ regions: A tale of thresholds, impurities and sequence context

Author:
Mier, Pablo; Elena-Real, Carlos; Urbanek, Annika; Bernadó, Pau; Andrade-Navarro, Miguel A.
Source:
Computational and Structural Biotechnology Journal 2020 v.18 pp. 306-313
ISSN:
2001-0370
Subject:
proline,   etc   ; data collection; eukaryotic cells; glutamine; humans; leucine; proteome;     Show all 7 Subjects
Abstract:
... Polyglutamine (polyQ) regions are one of the most prevalent homorepeats in eukaryotes. It is however difficult to evaluate their prevalence because various studies claim different results. The reason is the lack of a consensus to define what is indeed a polyQ region. We have tackled this issue by studying how the use of different thresholds (i.e., minimum number of glutamines required in a protein ...
DOI:
10.1016/j.csbj.2020.01.012
PubMed:
32071707
PubMed Central:
PMC7016039

5. Structural peculiarities of lysozyme – PLURONIC complexes at the aqueous-air and liquid-liquid interfaces and in the bulk of aqueous solution

Author:
Chernysheva, Maria G.; Shnitko, Alexey V.; Ksenofontov, Alexander L.; Arutyunyan, Alexander M.; Petoukhov, Maxim V.; Badun, Gennadii A.
Source:
International journal of biological macromolecules 2020 v.158 pp. 721-731
ISSN:
0141-8130
Subject:
proline,   etc   ; aqueous solutions; computer simulation; drugs; egg albumen; fluorescence; hydrophobicity; liquid-liquid interface; lysozyme; polymers; spectroscopy;     Show all 11 Subjects
Abstract:
... Interaction between proteins and synthetic polymers that represent a perspective potential in drug delivery or/and already used in medicine plays a key role in biological functioning of both molecules along with a system as a whole. In present study association between hen egg white lysozyme and Pluronic triblock-copolymers (L121, P123 and F127) in the bulk of the solution as well as at the aqueou ...
DOI:
10.1016/j.ijbiomac.2020.04.221

6. Three–level simultaneous component analysis for analyzing the near–infrared spectra of aqueous solutions under multiple perturbations

Author:
Han, Li; Cui, Xiaoyu; Cai, Wensheng; Shao, Xueguang
Source:
Talanta 2020 v.217 pp. 121036
ISSN:
0039-9140
Subject:
proline,   etc   ; aqueous solutions; dissociation; isoelectric point; near-infrared spectroscopy; pH; quantitative analysis; spectral analysis; temperature;     Show all 9 Subjects
Abstract:
... Quantitative analysis under various perturbations is a difficult problem because the analytical signal changes with different factors. In this work, three–level simultaneous component analysis (3–MSCA) was used for analyzing the near–infrared (NIR) spectra of aqueous solutions under different perturbations. The spectral data of aqueous proline solutions at different pH, concentration and temperatu ...
DOI:
10.1016/j.talanta.2020.121036

7. Sub-Ångstrom structure of collagen model peptide (GPO)10 shows a hydrated triple helix with pitch variation and two proline ring conformations

Author:
Suzuki, Hironori; Mahapatra, Deepti; Board, Amanda J.; Steel, Peter J.; Dyer, Jolon M.; Gerrard, Juliet A.; Dobson, Renwick C.J.; Valéry, Céline
Source:
Food chemistry 2020 v.319 pp. 126598
ISSN:
0308-8146
Subject:
proline,   etc   ; biomimetics; collagen; crystal structure; engineering; food industry; mammals; peptides; structural proteins; sustainable agriculture;     Show all 10 Subjects
Abstract:
... Collagens are large structural proteins that are prevalent in mammalian connective tissue. Peptides designed to include a glycine-proline-hydroxyproline (GPO) amino acid triad are biomimetic analogs of the collagen triple helix, a fold that is a hallmark of collagen-like sequences. To inform the rational engineering of collagen-like peptides and proteins for food systems, we report the crystal str ...
DOI:
10.1016/j.foodchem.2020.126598

8. Immobilization of proline activated lipase within metal organic framework (MOF)

Author:
Nadar, Shamraja S.; Rathod, Virendra K.
Source:
International journal of biological macromolecules 2020 v.152 pp. 1108-1112
ISSN:
0141-8130
Subject:
proline,   etc   ; biomineralization; carboxylic ester hydrolases; catalytic activity; coordination polymers; thermal stability;     Show all 6 Subjects
Abstract:
... The immobilization of enzyme with enhanced catalytic activity is the major challenge. In this work, we have activated the lipase in the presence of proline and successfully immobilized into zeolitic imidazolate framework (ZIF)-8 by biomineralization method. The prepared lipase–proline MOF exhibited 135% enhanced catalytic activity as compared to free counterpart. Further, it exhibited four-fold im ...
DOI:
10.1016/j.ijbiomac.2019.10.199

9. Assessment of ammonium fertilization as a stimulus for proline accumulation in Oryza sativa L. during cyanide assimilation

Author:
Liu, W.; Yu, X.-Z.; Lei, S.-Y.; Yang, L.; Lin, Y.-J.
Source:
International journal of environmental science and technology 2020 v.17 no.5 pp. 2811-2818
ISSN:
1735-1472
Subject:
proline,   etc   ; Oryza sativa; ammonium; ammonium fertilizers; fertilizer application; nitrogen; potassium cyanide; rice; roots; seedlings; shoots; starvation;     Show all 12 Subjects
Abstract:
... The interactions between ammonium fertilization, cyanide (KCN) assimilation and proline accumulation in rice seedlings (Oryza sativa L. cv. XZX 45) were investigated during the current investigation. Results indicated that rice seedlings possess effective assimilation potential for exogenous CN⁻ after 2-d exposure, where increases in the assimilation rates of CN⁻ were negatively correlated with am ...
DOI:
10.1007/s13762-020-02686-0

10. Entrapment of enzyme in the presence of proline: effective approach to enhance activity and stability of horseradish peroxidase

Author:
Singh, Rajani; Jha, Ambuj Bhushan; Misra, Amarendra Narayan; Sharma, Pallavi
Source:
3 Biotech 2020 v.10 no.4 pp. 155
ISSN:
2190-572X
Subject:
proline,   etc   ; cadmium; gels; lead; pH; peroxidase; polyacrylamide; sodium azide; storage quality; temperature; thermal stability;     Show all 11 Subjects
Abstract:
... In this report, activity and stability of horseradish peroxidase (HRP) entrapped in polyacrylamide gel in the presence of proline (HEP) are compared with that of enzyme entrapped in absence of proline (HE). Within polyacrylamide (8%) beads, 80% entrapment yield for peroxidase was observed in the presence as well as absence of proline. The HEP (1.5 M proline) showed 170% higher activity compared to ...
DOI:
10.1007/s13205-020-2140-7
PubMed:
32181117
PubMed Central:
PMC7054467

11. A recyclable and highly stereoselective multi-fluorous proline catalyst for asymmetric aldol reactions

Author:
Ishihara, Kazuki; Obayashi, Riho; Gotoh, Machiko; Watanabe, Yuki; Kobayashi, Yuki; Ishihara, Kotaro; Shioiri, Takayuki; Matsugi, Masato
Source:
Tetrahedron letters 2020 v.61 no.13 pp. 151657
ISSN:
0040-4039
Subject:
proline,   etc   ; adsorption; catalysts; catalytic activity; chemical reactions; chemical structure; organic compounds; stereoselectivity;     Show all 8 Subjects
Abstract:
... A recyclable fluorous proline catalyst with high stereoselectivity that functions as a catalyst for asymmetric aldol reactions is described. Its high stereoselectivity and facile recovery are achieved by employing a multi-fluorous tag attachment strategy. Although a gradual decrease was observed with respect to the catalytic activity, the catalyst can be separated from the reaction mixture by adso ...
DOI:
10.1016/j.tetlet.2020.151657

12. Augmentation of Enantioselectivity by Spatial Tuning of Aminocatalyst: Synthesis of 2-Alkyl/aryl-3-nitro-2H-chromenes by Tandem Oxa-Michael–Henry Reaction

Author:
Mohanta, Rahul; Bez, Ghanashyam
Source:
Journal of organic chemistry 2020 v.85 no.7 pp. 4627-4636
ISSN:
1520-6904
Subject:
proline,   etc   ; Lewis bases; catalysts; chemical reactions; chemical structure; enantioselectivity; hydroxybenzaldehyde; nitroalkenes; organic chemistry;     Show all 9 Subjects
Abstract:
... The asymmetric oxa-Michael addition of salicylaldehyde to conjugated nitroalkenes often suffers from poor reactivity and selectivity and a long reaction time. Because of the formation of an iminium ion with aminocatalyst, the nucleophilicity of the phenolic hydroxy group in salicylaldehyde reduces further to make the oxa-Michael reaction reversible. Here, we report a structurally simple and easily ...
DOI:
10.1021/acs.joc.9b03366

13. Continuous-flow photo-induced decarboxylative annulative access to fused imidazole derivatives via a microreactor containing immobilized ruthenium

Author:
Adiyala, Praveen Reddy; Jang, Seungwook; Vishwakarma, Niraj K.; Hwang, Yoon-Ho; Kim, Dong-Pyo
Source:
Green chemistry 2020 v.22 no.5 pp. 1565-1571
ISSN:
1463-9270
Subject:
proline,   etc   ; catalysts; chemical bonding; decarboxylation; fluorescence; green chemistry; imidazole; polydimethylsiloxane; ruthenium;     Show all 9 Subjects
Abstract:
... Visible-light-driven continuous-flow decarboxylative annulation was achieved and used along with a microreactor containing immobilized ruthenium catalyst to construct valuable fused imidazole derivatives with high yields under an open atmosphere. Notably, this chemistry included the use of l-proline and α-azidochalcone as precursors of an α-amino radical and 2H-azirine via photo-induced decarboxyl ...
DOI:
10.1039/c9gc03496j

14. Improvement of Curvulamine Production by Precursors Co-addition Strategy in Liquid Culture of Marine-Derived Fungus Curvularia sp. IFB-Z10

Author:
Wei, Xing-Chen; Liu, Chang-Qing; Zhang, Ri-Yu; Zheng, Gao-Fan; An, Fa-Liang; Lu, Yan-Hua
Source:
Applied biochemistry and biotechnology 2020 v.190 no.1 pp. 73-89
ISSN:
0273-2289
Subject:
proline,   etc   ; Curvularia; alanine; alkaloids; antibacterial properties; bioreactors; biosynthesis; carbon metabolism; genes; liquids; marine fungi; submerged fermentation;     Show all 12 Subjects
Abstract:
... Curvulamine, a novel scaffold alkaloid with remarkable selective antibacterial activity, is produced by marine fungus Curvularia sp. IFB-Z10. However, its deep pharmaceutical research and application are severely restricted by the low yield, which needs to be solved urgently. The purpose of this study was to improve curvulamine production via precursors co-addition strategy and further reveal the ...
DOI:
10.1007/s12010-019-03072-4

15. A Concise Asymmetric Total Synthesis of (+)-Epilupinine

Author:
Tsutsumi, Tomohiro; Karanjit, Sangita; Nakayama, Atsushi; Namba, Kosuke
Source:
Organic letters 2019 v.21 no.8 pp. 2620-2624
ISSN:
1523-7052
Subject:
proline,   etc   ; alkylation; moieties; organic compounds; oxidation; ozone;     Show all 6 Subjects
Abstract:
... Asymmetric total synthesis of (+)-epilupinine was achieved in just three steps using only commercially available common reagents. The total synthesis involved alkylations of N-nosylamide, ozone oxidation, and sequential reactions of the removal of the nosyl group, intramolecular dehydrative condensation, intramolecular Mannich reaction catalyzed by l-proline, and a reduction. ...
DOI:
10.1021/acs.orglett.9b00607

16. Total Synthesis and Structural Elucidation of (−)-Cephalezomine G

Author:
Jeon, Hongjun; Cho, Hyunkyung; Kim, Sanghee
Source:
Organic letters 2019 v.21 no.4 pp. 1121-1124
ISSN:
1523-7052
Subject:
proline,   etc   ; moieties; optical isomerism; organic compounds; stereoselectivity;     Show all 5 Subjects
Abstract:
... The first asymmetric synthesis and configurational elucidation of (−)-cephalezomine G was achieved. The highly functionalized Cα-substituted proline derivative was prepared from d-proline as the only chiral source via a C → N → C chirality transfer method consisting of stereoselective N-allylation and [2,3]-Stevens rearrangement. The azaspiranic tetracyclic backbone was constructed using ring-clos ...
DOI:
10.1021/acs.orglett.9b00036

17. Construction of Challenging Proline–Proline Junctions via Diselenide–Selenoester Ligation Chemistry

Author:
Sayers, Jessica; Karpati, Phillip M. T.; Mitchell, Nicholas J.; Goldys, Anna M.; Kwong, Stephen M.; Firth, Neville; Chan, Bun; Payne, Richard J.
Source:
Journal of the American Chemical Society 2018 v.140 no.41 pp. 13327-13334
ISSN:
1520-5126
Subject:
proline,   etc   ; moieties; polypeptides; proteins;     Show all 4 Subjects
Abstract:
... Polyproline sequences are highly abundant in prokaryotic and eukaryotic proteins, where they serve as key components of secondary structure. To date, construction of the proline–proline motif has not been possible owing to steric congestion at the ligation junction, together with an n → π* electronic interaction that reduces the reactivity of acylated proline residues at the C-terminus of peptides ...
DOI:
10.1021/jacs.8b07877

18. Ascorbate inducible N259 glycans on prolyl 4-hydroxylase subunit α1 promote hydroxylation and secretion of type I collagen

Author:
Shi, Run; Hu, Weimin; Zhang, Yan; Gao, Shanshan; Smith, Andrew H.; Ye, Jun; Cai, Lili; Graham, Linda M.; Li, Chaoyang
Source:
Cellular and molecular life sciences 2019 v.76 no.17 pp. 3449-3464
ISSN:
1420-682X
Subject:
procollagen-proline dioxygenase; proline,   etc   ; ascorbic acid; collagen; enzyme activity; fibroblasts; glycosylation; hydroxylation; magnesium; polysaccharides; secretion;     Show all 11 Subjects
Abstract:
... Ascorbic acid (vitamin C, VC) increases the secretion of mature collagen by promoting the activity of prolyl 4-hydroxylase subunit α 1 (P4HA1). To explore the mechanism involved, we investigated the role of N-linked glycosylation, which can regulate enzyme activity. P4HA1 has two glycosylation sites, Asn (N) 113 and N259. Our studies show that glycosylation of N259, but not N113, by STT3B and magn ...
DOI:
10.1007/s00018-019-03081-w
PubMed:
30919021
PubMed Central:
PMC6698205

19. Interaction of lead and cadmium on growth and leaf morphophysiological characteristics of European hackberry (Celtis australis) seedlings

Author:
Hatamian, Mansoure; Rezaei Nejad, Abdolhossein; Kafi, Mohsen; Souri, Mohammad Kazem; Shahbazi, Karim
Source:
Chemical and biological technologies in agriculture 2020 v.7 no.1 pp. 9
ISSN:
2196-5641
Subject:
proline,   etc   ; Celtis australis; cadmium; greenhouse production; growth retardation; irrigation water; lead; leaf area; leaves; ornamental trees; photosynthesis; seedlings; sugars; transpiration;     Show all 14 Subjects
Abstract:
... BACKGROUND: In the present study, different concentrations of lead (factor A; 0, 15, and 30 mg L ⁻¹) and cadmium (factor B; 0 and 5 mg L ⁻¹) were applied via irrigation water during 6 months to evaluate their effects on growth of European hackberry (Celtis australis L.) plants. The experiment was arranged in factorial with completely randomized design and four replications under greenhouse conditi ...
DOI:
10.1186/s40538-019-0173-0

20. Physiological effects of the combined stresses of freezing-thawing, acid precipitation and deicing salt on alfalfa seedlings

Author:
Bao, Guozhang; Tang, Wenyi; An, Qirui; Liu, Yaoxin; Tian, Jiaqi; Zhao, Nan; Zhu, Saning
Source:
BMC plant biology 2020 v.20 no.1 pp. 204
ISSN:
1471-2229
Subject:
proline,   etc   ; Medicago sativa; alfalfa; chlorophyll; deicing agents; freeze-thaw cycles; malondialdehyde; permeability; protein content; seedlings; sugars; temperature; China;     Show all 13 Subjects
Abstract:
... BACKGROUND: Frequent freeze-thaw phenomena, together with widely used deicing salt and intense acid precipitation, often occur in northeastern China, causing damage to various aspects of plants, such as the permeability of biological membranes, osmotic adjustment, and photosystems. Aiming to explore the resistance of alfalfa to freezing-thawing (F), acid precipitation (A) and deicing salt (D), thi ...
DOI:
10.1186/s12870-020-02413-4