6-Hydroxymellein (6HM) synthase, a multifunctional polyketide biosynthetic enzyme in carrot cells, is capable of catalyzing the acyl-CoA condensation and the ketoreduction in the presence of the nucleotide reducing co-factors. Although free CoA at high concentrations functioned as the activator ...

6-Hydroxymellein synthase, a multifunctional polyketide biosynthetic enzyme of carrot, lost the binding ability toward its co-substrates, acetyl- and malonyl-CoAs, by the treatment with the blocking reagents for serine-OH. In contrast, the enzyme retained the binding ability even when the two SH...

6-Hydroxymellein synthase, a multifunctional polyketide synthetic enzyme in carrot, is organized as a homodimer, and the activity of the synthase was appreciably inhibited upon the specific alkylation of cysteine- and cysteamine-SHs at the reaction center with iodoacetoamide and chloroacetyl-CoA...

Synthetic activity of a polyketide compound 6-hydroxymellein was induced in elicitor-treated carrot root tissues. The activity was significantly inhibited by an antiserum raised against the acyl carrier protein (ACP) of fatty acid synthetase, suggesting that the enzyme(s) for 6-hydroxymellein sy...

6-Methoxymellein (6-MM) is the carrot phytoalexin and 6-hydroxymellein (6-HM) its immediate biosynthetic precursor. 6-MM is more toxic than 6-HM to the producing carrot cells, as demonstrated by the differential toxicity of these two dihydroisocoumarins to either colony forming units in solid me...

Activity of 6-hydroxymellein synthase, an inducible polyketide biosynthetic enzyme in carrot cell extracts, was appreciably inhibited in the presence of molar levels of NaCl or (NH4)2SO4. However, the salt-induced inhibition of the synthase activity was reversible, and was almost fully restored ...

Activity of 6-hydroxymellein synthase, an induced polyketide synthetic enzyme in carrot cell extract, was not inhibited by cerulenin which is known as a potent inhibitor for fatty acid synthases and biosynthetic enzymes of various polyketide compounds. However, when 6-hydroxymellein synthase was...

6-Methoxymellein, a phytoalexin of carrot, and 6-hydroxymellein, its presumed biosynthetic precursor, were isolated from carrot root slices infected with Sclerotium rolfsii and Fusarium solani. Elicitation of both 6-methoxymellein and 6-hydroxymellein synthesis was achieved also in carrot cell s...

Recently [11C]mG4P012 (previously [11C]KALB012 and presently named as [11C]PXT012253 by Prexton Therapeutics) had been used as a biomarker during the preclinical development of a potential therapeutic drug, PXT0002331 (an mGluR4 PAM), for PD and l-dopa-induced dyskinesia. [11C]mG4P012 was shown ...

A neuropeptide which stimulates the motility of the cockroach hindgut has been isolated from an extract of 9000 brain-corpora cardiaca-corpora allata-subesophageal ganglion complexes of Locusta migratoria. Biological activity was monitored during HPLC purification by observing the myotropic effe...

1. A blocked decapeptide was isolated from brain corpora cardiaca-corpora allata sub-oesophageal ganglion extracts of the locust, Locusta migratoria. Biological activity was monitored during HPLC purification by observing the myotropic effect of column fractions on the isolated hindgut of Leucop...

Fluorescent carbon dots (CDs) were synthesized through hydrothermal treatment of an easily available fish scales precursor. The as-prepared CDs exhibit good water-solubility, wavelength-tunable fluorescence nature with fluorescence quantum yield of 9%, high photostability and resistance against ...

A series of 5-(4-substituted piperazin-1-yl)quinolin-2(1H)-one derivatives (4a-4w) has been designed as chitin synthase inhibitors and antifungal agents. The designed compounds were obtained by an environmentally benign route in four steps starting from 5-amino-3,4-dihydroquinolin-2(1H)-one whic...

A number of allyl esters of various carboxylic acids and N-protected amino acids were synthesized and their hydrolysis by Candida antarctica lipase B and pig liver esterase was studied. In order to test the selectivity, the enzymatic hydrolysis of the corresponding methyl and ethyl esters was al...

Diblock copolymers (PPDLx-b-pPAAy) were prepared from ω-pentadecalactone and l-glutamic acid or l-lysine amino acids by ring opening polymerization initiated by amino groups. Telechelic amino-ended poly(ω-pentadecalactone) with a length of 15–20 repeating units was firstly synthesized by enzy...

Seven new oleanane-type saponins, named araliasaponins XII-XVIII, were isolated from the roots of Aralia chinensis, together with 14 known triterpene saponins. On the basis of the chemical and spectroscopic evidence, the structures of these new saponins were elucidated as follows: 3-O-β-d-gluco...

An enhanced spiroketalization maneuver permitting equilibration at both the C(8) and C(11) centers of spiroketals 17a,b leads to a more concise and efficient synthesis of phyllanthocin (i.e., 21 steps, 5.6% overall yield).

The antineoplastic glycoside (+)-phyllanthostatin 3 (4) has been synthesized for the first time, together with its aglycone (+)-phyllanthocindiol (5).

A novel Schiff base copper complex, bis[(E)-1-((3-chloro-4-methylphenylimino)methyl) naphthalen-2-olate-N,O]copper(II), has been synthesized and characterized by FT-IR and X-ray diffraction techniques. The compound crystallizes in the monoclinic space group P21/n with a = 13.7391 (8) Å, b = 5.64...

The optimized molecular structure, vibrational frequencies, corresponding vibrational assignments of 3-(4-fluorophenyl)-5-phenyl-4,5-dihydro-1H-pyrazole-1-carbaldehyde have been investigated experimentally and theoretically. The title compound was optimized using at HF and DFT levels of calculat...