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https://www.readbyqxmd.com/read/28654178/dual-catalytic-activity-of-a-cytochrome-p450-controls-bifurcation-at-a-metabolic-branch-point-of-alkaloid-biosynthesis-in-rauwolfia-serpentina
#1
Thu-Thuy T Dang, Jakob Franke, Evangelos C Tatsis, Sarah E O'Connor
Plants create tremendous chemical diversity from a single biosynthetic intermediate. In plant-derived ajmalan alkaloid pathways, the biosynthetic intermediate vomilenine can be transformed into the anti-arrhythmic compound ajmaline, or alternatively, can isomerize to form perakine, an alkaloid with a structurally distinct scaffold. Here we report the discovery and characterization of vinorine hydroxylase, a cytochrome P450 that hydroxylates vinorine to form vomilenine, which was found to exist as a mixture of rapidly interconverting epimers...
June 27, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28654009/labradorins-with-antibacterial-activity-produced-by-pseudomonas-sp
#2
Anders Broberg, Joakim Bjerketorp, Pierre Andersson, Christer Sahlberg, Jolanta J Levenfors
The urgent need for new antibacterial drugs has led to renewed interest in microorganisms, which historically have been the main source of previously discovered antibiotics. The present study describes the discovery of two new antibacterial oxazolylindole type alkaloids, labradorins 5 (1) and 6 (2), which were isolated and characterized from two isolates of Pseudomonas sp., along with four previously known tryptophane derived alkaloids. The structures of 1 and 2 were determined by NMR spectroscopy and MS, and confirmed by synthesis...
June 27, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28653916/biological-activities-of-allium-sativum-and-zingiber-officinale-extracts-on-clinically-important-bacterial-pathogens-their-phytochemical-and-ft-ir-spectroscopic-analysis
#3
Uzma Azeem Awan, Shaukat Ali, Amna Mir Shahnawaz, Irsa Shafique, Atiya Zafar, Muhammad Abdul Rauf Khan, Tahseen Ghous, Azhar Saleem, Saiqa Andleeb
The spread of bacterial infectious diseases is a major public threat. Herbs and spices have offered an excellent, important and useful source of antimicrobial agents against many pathological infections. In the current study, the antimicrobial potency of fresh, naturally and commercial dried Allium sativum and Zingiber officinale extracts had been investigated against seven local clinical bacterial isolates such as Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumonia, Staphylococcus aureus, Streptococcus pyogenes, Staphylococcus epidermidis, and Serratia marcesnces by the agar disc diffusion method...
May 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28653156/revealing-the-potency-of-annona-muricata-leaves-extract-as-foxo1-inhibitor-for-diabetes-mellitus-treatment-through-computational-study
#4
Dini Sri Damayanti, Didik Huswo Utomo, Chandra Kusuma
FOXO1 protein inactivation in the nucleus is one of targets for the treatment of diabetes mellitus. Annona muricata leaves contain flavonoid and phenolic compound alkaloids that were known to be able to increase pancreatic β cell proliferation in animal experiment. This research aimed to predict the active compound ability of the Annona muricata leaves to bind and inhibit FOXO1 protein through in silico study. Analysis of molecular docking was performed by using Autodock Vina PyRx. this research proved that anonaine, rutin, muricatocin a, isolaureline, xylopine, and kaempferol 3-O-rutinoside had an equal or smaller free binding energy compared to the control compound...
December 2016: In Silico Pharmacology
https://www.readbyqxmd.com/read/28651578/characterization-of-phytoconstituents-and-evaluation-of-antimicrobial-activity-of-silver-extract-nanoparticles-synthesized-from-momordica-charantia-fruit-extract
#5
Md Mamun Or Rashid, Kazi Nahid Akhter, Jakir Ahmed Chowdhury, Foysal Hossen, Md Saddam Hussain, Md Tanvir Hossain
BACKGROUND: Our present study was conducted to characterize the phytoconstituents present in the aqueous extract of Momordica charantia and evaluate the antimicrobial efficacy of silver-extract nanoparticles (Ag-Extract-NPs). METHODS: Silver nanoparticles (AgNPs) were prepared by reducing AgNO3; and NaBH4 served as reducing agent. After screening of phytochemicals; AgNPs and aqueous extract were mixed thoroughly and then coated by polyaniline. These NPs were characterized by using Visual inspection, UV spectroscopy, FTIR, SEM and TEM techniques...
June 26, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28651570/methanol-leaves-extract-hibiscus-micranthus-linn-exhibited-antibacterial-and-wound-healing-activities
#6
Berhan Begashaw, Bharat Mishra, Asegedech Tsegaw, Zewdneh Shewamene
BACKGROUND: Infectious diseases are the most common causes of morbidity and mortality in developing countries. Wound and wound infections are also major health problem. Nowadays, medicinal plants play a major role in treatment of infectious diseases and wound healing and they are easily available and more affordable as compared to synthetic compounds. The aim of this study is therefore, to investigate the antibacterial and wound healing activities of 80% methanol extract of Hibiscus micranthus leaves using disc diffusion methods and rat excision model respectively...
June 26, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28650983/differential-induction-of-apoptosis-and-autophagy-by-pyrrolizidine-alkaloid-clivorine-in-human-hepatoma-huh-7-5-cells-and-its-toxic-implication
#7
Wenju Liu, Xu Li, Bo Zhou, Shoucai Fang, Wenzhe Ho, Hui Chen, Hao Liang, Li Ye, Jun Tang
Growing evidence suggests that the pyrrolizidine alkaloids (PAs)-induced hepatotoxicity is mediated by multiple cell death/defence modalities. However, the detailed mechanisms are still lacking. In this study, the hepatotoxic effects of four PAs including three retronecine-type ones (senecionine, seneciphylline and monocrotaline) and one otonecine-type (clivorine) on the proliferation of Huh-7.5 cells and the possible mechanisms were investigated. The results showed that all the PAs could inhibit cell proliferation and induce apoptosis in a concentration-dependent manner...
2017: PloS One
https://www.readbyqxmd.com/read/28649696/amaryllidaceae-alkaloids-absolute-configuration-and-biological-activity
#8
REVIEW
Alessio Cimmino, Marco Masi, Marco Evidente, Stefano Superchi, Antonio Evidente
Plants belonging to the Amaryllidaceae family are well known for their ornamental and medicinal use. Plant members of this group are distributed through both tropical and subtropical regions of the world and are dominant in Andean South America, the Mediterranean basin, and southern Africa. Amaryllidaceae plants have been demonstrated to be a good source of alkaloids with a large spectrum of biological activities, the latter being strictly related to the absolute stereochemistry of the alkaloid scaffold. Among them, great importance for practical applications in medicine has galanthamine, which has already spawned an Alzheimer's prescription drug as a potent and selective inhibitor of the enzyme acetylcholinesterase...
June 26, 2017: Chirality
https://www.readbyqxmd.com/read/28649077/hepatoprotective-evaluation-of-aqueous-ethanolic-extract-of-capparis-decidua-stems-in-paracetamol-induced-hepatotoxicity-in-experimental-rabbits
#9
Jalilur Rehman, Naveed Akhtar, Hafiz Muhammad Asif, Sabira Sultana, Mukhtiar Ahmad
Liver diseases are the most common ailment all over the world mostly caused by viruses, toxic chemicals, excessive intake of alcohol, high doses of paracetamol, carbon tetrachloride, chemotherapeutic agents and peroxides oil, etc. There is a great need to assess the scientific basis for the medicinal plants that are claimed to have hepatoprotective activity. We investigate the hepatoprotective effects of aqueous-ethanolic extract of Capparis decidua (Stems) against paracetamol induced liver injury in experimental animals...
March 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28649067/pharmacognostic-and-phytochemical-studies-of-zanthoxylum-armatum-dc
#10
- Barkatullah, Muhammad Ibrar, Naveed Muhammad, Ajmal Khan, Shahid Ali Khan, Salman Zafar, Samin Jan, Nadia Riaz, Zain Ullah, Umar Farooq, Javid Hussain
The pharmacognostic and phytochemical investigations on the leaf, stem bark, and fruit of Zanthoxylum armatum were carried out. Macroscopic study of leaf, stem bark, and fruit of Z. armatum revealed some of the characteristic features like size, shape, color, odor and taste of the crude drug. Distinguishing fragments were identified from the powder drug. Leaf, bark, and fruit powder of this plant have higher values of total, acid insoluble, and water soluble ash as compared to the powder of this plant exhausted with ethanol and n- hexane...
March 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28649055/lonicera-quinquelocularis-a-rich-source-of-antioxidant-for-protection-against-chronic-diseases
#11
Sabahat Zahra Siddiqui, Hina Saleem, Muhammad Athar Abbasi, Azizur Rehman, Muhammad Ajaib
The purpose of the research work was to examine the in vitro antioxidant activity of the different aqueous and organic fractions of Lonicera quinquelocularis Hardwicke. The methanol extract was dissolved in distilled water and fractioned with n-hexane, chloroform, ethyl acetate and n-butanol, successively. The antioxidant potential of the remaining aqueous and organic fractions was determined by using 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) scavenging activity, total antioxidant activity, ferric reducing antioxidant power (FRAP) assay, ferric thiocyanate assay and total phenolics method...
March 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28648136/two-new-alkaloids-from-the-twigs-of-trigonostemon-filipes
#12
Yu Wang, Pei Wang, Fan-Dong Kong, Jun Wang, Wen-Jian Zuo, Hao Wang, Hao-Fu Dai, Wen-Li Mei
A phytochemical investigation of the alkaloid constituents from Trigonostemon filipes Y. T. Chang et S. L. Mo led to the isolation of two new indole alkaloids, trigonostemine G (1) and trigonostemone J (2), together with two known ones, trigonostemine A (3) and trigonostemine B (4). Their structures were determined by extensive spectroscopic methods. Compounds 1-4 exhibited moderate AChE inhibitory activity with inhibition ratio of 31.6, 31.7, 41.7, and 42.4%, respectively. In addition, compounds 1-2 showed weak cytotoxicity against K562 and BEL-7402 human cancer cell lines...
June 26, 2017: Journal of Asian Natural Products Research
https://www.readbyqxmd.com/read/28647508/fingerprint-efficacy-study-of-the-quaternary-alkaloids-in-corydalis-yanhusuo
#13
Qiuyue Li, Huanyu Guan, Xiaoming Wang, Yang He, Hong Sun, Wenting Tan, Xiaomei Luo, Meifeng Su, Yue Shi
ETHNOPHARMACOLOGICAL RELEVANCE: Corydalis yanhusuo is a well-known Chinese herbal medicine that is commonly applied as an analgesic agent in clinic using for thousands of years. Resent research showed that the quaternary ammonium alkaloids from Corydalis yanhusuo have a significant effect on myocardial ischemia. However, the corresponding anti-myocardial ischemia components that represent the efficacy of the quaternary ammonium alkaloids have not been elucidated. AIM OF THE STUDY: Explore the anti-myocardial ischemia components of Corydalis yanhusuo and develop a method of quality control for Corydalis yanhusuo...
June 21, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28647178/traditional-usage-phytochemistry-and-pharmacology-of-croton-sylvaticus-hochst-ex-c-krauss
#14
REVIEW
Alfred Maroyi
Croton sylvaticus (C. sylvaticus) is widely used as herbal medicine by the indigenous people of tropical Africa. The potential of C. sylvaticus as herbal medicine, the phytochemistry and pharmacological properties of its parts used as herbal medicines are reviewed. The extensive literature survey revealed that C. sylvaticus is traditionally used to treat or manage at least 24 human and animal diseases and ailments. The species is used as herbal medicine for diseases and ailments such as abdominal pains, boils, fever, inflammation, malaria, rheumatism, swellings and tuberculosis and as ethnoveterinary medicine...
May 2017: Asian Pacific Journal of Tropical Medicine
https://www.readbyqxmd.com/read/28646156/mahanine-exerts-in-vitro-and-in-vivo-antileishmanial-activity-by-modulation-of-redox-homeostasis
#15
Saptarshi Roy, Devawati Dutta, Eswara M Satyavarapu, Pawan K Yadav, Chhabinath Mandal, Susanta Kar, Chitra Mandal
Earlier we have established a carbazole alkaloid (mahanine) isolated from an Indian edible medicinal plant as an anticancer agent with minimal effect on normal cells. Here we report for the first time that mahanine-treated drug resistant and sensitive virulent Leishmania donovani promastigotes underwent apoptosis through phosphatidylserine externalization, DNA fragmentation and cell cycle arrest. An early induction of reactive oxygen species (ROS) suggests that the mahanine-induced apoptosis was mediated by oxidative stress...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28644981/chemical-profiling-and-antioxidant-evaluation-of-yangxinshi-tablet-by-hplc-esi-q-tof-ms-ms-combined-with-dpph-assay
#16
Junfeng Zhu, Xiaojiao Yi, Jinghui Zhang, Shuqing Chen, Yongjiang Wu
Yangxinshi Tablet (YXST) is a Chinese patent medicine commonly used to treat cardiovascular diseases. However, its detailed chemical basis and mechanisms of action have not been clarified. In this study, high performance liquid chromatography coupled with electrospray ionization quadrupole time-of-flight mass spectrometry (HPLC-ESI-Q-TOF-MS) was applied for comprehensive analysis of the chemical constituents in YXST. A total of 127 compounds, including 19 phenolic acids, 12 alkaloids, 51 flavanoids, 32 triterpenoids, 2 lignans, 2 phenylethanoid glycosides, 2 anthraquinones, 1 coumarin, and 6 other compounds, were identified or tentatively deduced by comparing their retention times and MS spectra with those of authentic standards or literature data...
June 15, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28644563/gas-phase-dissociation-study-of-erythrinian-alkaloids-by-electrospray-ionization-mass-spectrometry-and-computational-methods
#17
T Guaratini, L G P Feitosa, D B Silva, N P Lopes, J L C Lopes, R Vessecchi
Alkaloids from plants of the genus Erythrina display important biological activities, including anxiolytic action. Characterization of these alkaloids by mass spectrometry (MS) has contributed to the construction of a spectral library, has improved understanding of their structures, and has supported the proposal of fragmentation mechanisms in light of density functional calculations (DFT). In this study, we have used low- and high-resolution MS(n) analyses to investigate the fragmentation patterns of erythrinian alkaloids; we have employed the B3LYP/6-31+G(d,p) model to obtain their reactive sites...
June 23, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28642941/an-enantioselective-cascade-for-simultaneous-generation-of-five-quaternary-stereocenters-from-fully-substituted-enones
#18
Shu-Mei Yang, Ganapuram Madhusudhan Reddy, Tzu-Ping Wang, Yu-Sheng Yeh, Min Wang, Wenwei Lin
A highly enantioselective cascade reaction for the generation of five quaternary stereocenters in one-pot operation is reported for the first time in the history of organic synthesis. Cinchona-alkaloid derived hydrogen-bonding catalyst furnished structurally complex cascade products from simple substrates in excellent yields and stereoselectivities.
June 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28641526/biology-oriented-synthesis-bios-of-piperine-derivatives-and-their-comparative-analgesic-and-antiinflammatory-activities
#19
Ammar Yasir, Saiqa Ishtiaq, Muhammad Jahangir, Muhammad Ajaib, Uzma Salar, Khalid Mohammed Khan
BACKGROUND: Serious side effects such as gastric intestinal ulcer, bleeding etc. are associated with most of the antiinflammatory and analgesic drugs. So there is a need to search novel, potent, and safer antiinflammatory and analgesic drug. METHOD: Based on "biology-oriented synthesis approach", piperine alkaloid was isolated from Piper nigrum L. and some derivatives of piperine having azomethine, sulfamoyl, propanoyl, acetamoyl and heterocyclic oxadiazole were synthesized...
June 22, 2017: Medicinal Chemistry
https://www.readbyqxmd.com/read/28640646/an-enzyme-linked-immunosorbent-assay-for-monoester-type-aconitic-alkaloids-and-its-application-in-the-pharmacokinetic-study-of-benzoylhypaconine-in-rats
#20
Can-Can Liu, Yun-Hui Xu, Shuai Yuan, Yu Xu, Mo-Li Hua
A new enzyme-linked immunosorbent assay (ELISA) method for quantitative determination of monoester-type aconitic alkaloids was developed. The antibodies derived from the immunogen of benzoylmesaconine (BM) could be electively affined to benzoylaconitine-type alkaloids with an ester bond (14-benzoyl-), especially to benzoylhypaconine (BH, 140.02% of cross-reactivity). The effective working range of BH was 1 ng/ml to 5 μg/ml; the lower limit of detection and the quantification were 0.35 and 0.97 ng/ml, respectively...
June 22, 2017: Journal of Asian Natural Products Research
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