Four new p-aminoacetophenonic acids, named (2E)-11-(4′-aminophenyl)-5,9dihydroxy-4,6,8-trimethyl-11-oxo-undec-2-enoic acid (1), 9-(4′-aminophenyl)-3,7dihydroxy-2,4,6-trimethyl-9-oxo-nonoic acid (2), (2E)-11-(4′-aminophenyl)-5,9-O-cyclo4,6,8-trimethyl-11-oxo-undec-2-enoic acid (3) and 9-(4′-aminophenyl)-3,7-O-cyclo-2,4,6trimethyl-9-oxo-nonoic acid (4), were isolated from an endophyte Streptomyce...

Strain RT1 was isolated from root nodules of Lens culinaris (a lentil) and characterized as Rhizobium etli (a Gram-negative soil-borne bacterium) by 16S rDNA sequencing and phylogenetic analysis. The signaling molecules produced by R. etli (RT1) were detected and identified by high-performance liquid chromatography coupled with mass spectrometry. The most abundant and biologically active N-acyl...

The chemiluminescence of stimulated cells with phorbol myristate acetate and the production of nitric oxide after stimulation with lipopolisaccharide in the presence of the parent compounds FAA (flavone-8-acetic acid = (4-oxo-2phenyl-4H-chromen-8-yl)acetic acid), XAA (xanthone-4-acetic acid = (9-oxo-9Hxanthen-4-yl)acetic acid), and appropriate xanthone derivatives (1–7) was determined. Also the...

Fapy.dG and 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxo-dG) are formed in DNA by hydroxyl radical damage. In order to study replication past these lesions in cells, we constructed a single-stranded shuttle vector containing the lesion in 5'-TGT and 5'-TGA sequence contexts. Replication of the modified vector in simian kidney (COS-7) cells showed that Fapy.dG is mutagenic inducing primarily targe...

Deregulated redox metabolism in cancer leads to oxidative damage to cellular components including deoxyribonucleoside triphosphates (dNTPs). Targeting dNTP pool sanitizing enzymes, such as MTH1, is a highly promising anticancer strategy. The MTH2 protein, known as NUDT15, is described as the second human homologue of bacterial MutT with 8-oxo-dGTPase activity. We present the first NUDT15 crysta...

Here, we describe the chemical synthesis of the complete sets of 18 novel 3- and 21-monosulfates and their double-conjugated form of tetrahydrocortisol (THF), tetrahydro-11-deoxycortisol (THS), and tetrahydrocortisone (THE) in the 5alpha- and 5beta-series. The principal reactions involved are: (1) selective protection of a specific hydroxy group in substrates; (2) catalytic hydrogenation at C-5...

PURPOSE The synthetic retinoid fenretinide (4-HPR) exhibits preventive and therapeutic activity against ovarian tumors. An unidentified polar metabolite was previously found in 4-HPR-treated subjects and in A2780 human ovarian carcinoma cells continuously treated with 4-HPR (A2780/HPR). The metabolite and the enzyme involved in its formation in tumor cells are herein identified. EXPERIMENTAL ...

This article is available online at http://www.jlr.org Arachidonic acid (AA) metabolism is implicated in cellular and physiologic regulation, infl ammatory diseases, and cancer ( 1 ). In colon cancers, cyclooxygenase (COX)-2 expression is increased, and conversely, 15-prostaglandin dehydrogenase (PGDH) is downregulated ( 2 ). There is also evidence for COX-2/15-PGDH counterregulation in gastric...

Alfalfa seeds and seedlings contain an enzyme that catalyzes a reaction with the 13- and 9-hydroperoxides of linoleic acid to form 13-hydroxy-10-oxo-trans-octadecenoic acid and 9-hydroxy-12-oxo-trans-10-octadecenoic acid, respectively. When commercial lipoxygenase is used to generate the hydroperoxides, the above acids appear in about 2:1 proportions, respectively. The products of the action of...

A series of novel N-[2-(substitutedphenyl)-5-methyl-4-oxo-1,3-thiazolidin-3-yl]benzamides (4a-g) were synthesized and structurally confirmed by elemental analysis, IR, H NMR and MS spectral data. Further, the antiviral screening of N-[2-(substitutedphenyl)-5-methyl-4-oxo-1,3-thiazolidin-3-yl]benzamides (4a-g) against a broad panel of DNA and RNA viral strains indicated that N-[2-(4-chlorophenyl...