Characterization of QmnD3/QmnD4 for Double Bond Formation in Quartromicin Biosynthesis

2014 ◽  
Vol 16 (6) ◽  
pp. 1578-1581 ◽  
Author(s):  
Long-Fei Wu ◽  
Hai-Yan He ◽  
Hai-Xue Pan ◽  
Li Han ◽  
Renxiao Wang ◽  
...  
Keyword(s):  
Double Bond ◽  
Bond Formation

Carbon-carbon double-bond formation in the intermolecular acetonitrile reductive coupling promoted by a mononuclear titanium(II) compound. Preparation and characterization of two titanium(IV) imido derivatives

1991 ◽  
Vol 30 (25) ◽  
pp. 4863-4866 ◽  
Author(s):  
Robbert. Duchateau ◽  
Antony J. Williams ◽  
Sandro. Gambarotta ◽  
Michael Y. Chiang
Keyword(s):  
Double Bond ◽  
Bond Formation ◽  
Reductive Coupling ◽  
Carbon Double Bond

The structural and functional characterization of Malus domestica double bond reductase MdDBR provides insights towards the identification of its substrates

2021 ◽  
Vol 171 ◽  
pp. 89-99
Author(s):  
Rosanna Caliandro ◽  
Ivan Polsinelli ◽  
Nicola Demitri ◽  
Francesco Musiani ◽  
Stefan Martens ◽  
...  
Keyword(s):  
Double Bond ◽  
Malus Domestica ◽  
Functional Characterization ◽  
Double Bond Reductase

scholarly journals Channeling of Eukaryotic Diacylglycerol into the Biosynthesis of Plastidial Phosphatidylglycerol

2006 ◽  
Vol 282 (7) ◽  
pp. 4613-4625 ◽  
Author(s):  
Markus Fritz ◽  
Heiko Lokstein ◽  
Dieter Hackenberg ◽  
Ruth Welti ◽  
Mary Roth ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Double Bond ◽  
Transgenic Plants ◽  
Phosphatidic Acid ◽  
Lipid Analysis ◽  
Photosynthetic Apparatus ◽  
Hexadecenoic Acid ◽  
Transgenic Tobacco Plants ◽  
Tobacco Plants

Plastidial glycolipids contain diacylglycerol (DAG) moieties, which are either synthesized in the plastids (prokaryotic lipids) or originate in the extraplastidial compartment (eukaryotic lipids) necessitating their transfer into plastids. In contrast, the only phospholipid in plastids, phosphatidylglycerol (PG), contains exclusively prokaryotic DAG backbones. PG contributes in several ways to the functions of chloroplasts, but it is not known to what extent its prokaryotic nature is required to fulfill these tasks. As a first step toward answering this question, we produced transgenic tobacco plants that contain eukaryotic PG in thylakoids. This was achieved by targeting a bacterial DAG kinase into chloroplasts in which the heterologous enzyme was also incorporated into the envelope fraction. From lipid analysis we conclude that the DAG kinase phosphorylated eukaryotic DAG forming phosphatidic acid, which was converted into PG. This resulted in PG with 2–3 times more eukaryotic than prokaryotic DAG backbones. In the newly formed PG the unique Δ3-trans-double bond, normally confined to 3-trans-hexadecenoic acid, was also found in sn-2-bound cis-unsaturated C18 fatty acids. In addition, a lipidomics technique allowed the characterization of phosphatidic acid, which is assumed to be derived from eukaryotic DAG precursors in the chloroplasts of the transgenic plants. The differences in lipid composition had only minor effects on measured functions of the photosynthetic apparatus, whereas the most obvious phenotype was a significant reduction in growth.

ChemInform Abstract: Chemistry of Organolanthanoids. Lanthanoid-Mediated C-C Bond Formation and Cleavage and C-C Double Bond Reduction.

ChemInform ◽  
1988 ◽  
Vol 19 (2) ◽  
Author(s):  
Z. HOU ◽  
Y. FUJIWARA ◽  
T. JINTOKU ◽  
N. MINE ◽  
K. YOKOO ◽  
...  
Keyword(s):  
Double Bond ◽  
Bond Formation

Critical Review of Biotransformational Studies on Steroids by Using Culture of Cunninghamella blakesleeana

2021 ◽  
Vol 18 ◽  
Author(s):  
Azizuddin ◽  
Muhammad Iqbal ◽  
Syed Ghulam Musharraf
Keyword(s):  
Double Bond ◽  
Critical Review ◽  
Structural Modification ◽  
Bond Formation ◽  
Environmentally Friendly ◽  
Side Chain ◽  
Synthetic Compounds ◽  
Efficient Approach ◽  
Cunninghamella Blakesleeana ◽  
Different Strains

: For several decades, biotransformational studies on steroidal compounds have gained a lot of attention because it is an efficient approach for the structural modification of complicated natural or synthetic compounds with high regio-, chemo- and stereoselectivity at environmentally friendly conditions. This review summarizes the use of different strains of Cunninghamella blakesleeana for the biotransformation of sixteen steroids 1-16 into a variety of transformed products. The transformed products may be important as a drug or precursor for the production of important pharmaceuticals. The types of reactions performed by C. blakesleeana include hydroxylation, epoxidation, reduction, demethylation, oxidation, glycosidation, double bond formation, side-chain degradation, isomerisation and opening of an isoxazol ring, which would be difficult to produce by traditional synthesis.

scholarly journals Cathodic hydrodimerization of nitroolefins

2015 ◽  
Vol 11 ◽  
pp. 1163-1174 ◽  
Author(s):  
Michael Weßling ◽  
Hans J Schäfer
Keyword(s):  
Double Bond ◽  
Nitro Group ◽  
Bond Formation ◽  
Cathodic Reduction ◽  
High Yield ◽  
Easy Access ◽  
Electrolysis Cell ◽  
Aldehydes And Ketones ◽  
Nef Reaction

Nitroalkenes are easily accessible in high variety by condensation of aldehydes with aliphatic nitroalkanes. They belong to the group of activated alkenes that can be hydrodimerized by cathodic reduction. There are many olefins with different electron withdrawing groups used for cathodic hydrodimerization, but not much is known about the behaviour of the nitro group. Synthetic applications of this group could profit from the easy access to nitroolefins in large variety, the C–C bond formation with the introduction of two nitro groups in a 1,4-distance and the conversions of the nitro group by reduction to oximes and amines, the conversion into aldehydes and ketones via the Nef reaction and base catalyzed condensations at the acidic CH bond. Eight 1-aryl-2-nitro-1-propenes have been electrolyzed in an undivided electrolysis cell to afford 2,5-dinitro-3,4-diaryl hexanes in high yield. The 4-methoxy-, 4-trifluoromethyl-, 2-chloro- and 2,6-difluorophenyl group and furthermore the 2-furyl and 2-pyrrolyl group have been applied. The reaction is chemoselective as only the double bond but not the nitro group undergoes reaction, is regioselective as a ß,ß-coupling with regard to the nitro group and forms preferentially two out of six possible diastereomers as major products.

Microscopic mechanism for SiO2/Si interface passivation: Si=O double bond formation

1997 ◽  
Vol 380 (1) ◽  
pp. 61-65 ◽  
Author(s):  
H. Kageshima ◽  
K. Shiraishi
Keyword(s):  
Double Bond ◽  
Bond Formation ◽  
Microscopic Mechanism ◽  
Interface Passivation

scholarly journals Systematic Syntheses and Characterization of Dodecadien-1-olswith Conjugated Double Bond, Lepidopterous Sex Pheromones

1985 ◽  
Vol 49 (1) ◽  
pp. 141-148 ◽  
Author(s):  
Tetsu Ando ◽  
Yuichi Kurotsu ◽  
Mieko Kaiya ◽  
Masaaki Uchiyama
Keyword(s):  
Double Bond ◽  
Sex Pheromones

scholarly journals An effective C–C double bond formation via Cu(I)-catalyzed dehydrogenation

2010 ◽  
Vol 51 (14) ◽  
pp. 1822-1825 ◽  
Author(s):  
Thomas A. Ramirez ◽  
Baoguo Zhao ◽  
Yian Shi
Keyword(s):  
Double Bond ◽  
Bond Formation
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