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Amyloid-beta (Abeta) peptides play a key role in the pathogenesis of Alzheimer's disease and exert various toxic effects on neurons; however, relatively little is known about their influence on glial cells. Astrocytes play a pivotal role in brain homeostas ...
Cyclodepsipeptides incorporating a sugar amino acid, e.g., I, have been synthesized. A three-component reaction of a sugar amino acid (SAA) deriv., an aldehyde, and a dipeptide isonitrile in refluxing methanol afforded the corresponding 5-aminooxazole whic ...
Using readily available chiral auxiliaries such as (+)- and (-)-camphanic acid, (R,R)- and (S,S)-tartaric acid derivatives (e.g. RADO(R)-COCl, SADO(R)-COCl) efficient diastereoselective syntheses of rare sugars and glycomimetics have been developed. They e ...
The primary metabolic route for D-xylose, the second most abundant sugar in nature, is via the pentose phosphate pathway after a two-step or three-step conversion to xylulose-5-phosphate. Xylulose kinase (XK; EC 2.7.1.17) phosphorylates D-xylulose, the las ...
During a previous, exploratory project in our group, it was observed that duplexes formed by oligonucleotides modified with polar 2'-O-substituents were more tolerant towards the addition of 1,2-dimethoxyethane (DME) than RNA and DNA duplexes [1]. Inspired ...
The formation of 4-hydroxy-2,5-dimethyl-3(2H)-furanone (HDMF) and 2(or 5)-ethyl-4-hydroxy-5(or 2)-methyl-3(2H)-furanone (EHMF) from pentose sugars was studied in Maillard model systems. The amts. generated at 90 DegC for 1 h were detd. by isotope diln. ass ...
Carotenoid prodn. by microorganisms, as opposed to chem. synthesis, could fulfill an ever-increasing demand for 'all natural' products. The yeast Phaffia rhodozyma has received considerable attention because it produces the red pigment astaxanthin, commonl ...
We describe the development of a computational approach for the identification of every possible biochem. reaction from a given set of enzyme reaction rules that allows the de novo synthesis of metabolic pathways composed of these reactions, and the evalua ...
Recent applications of the "naked sugar" methodology are reviewed. General methods have been developed to transform enantiomerically pure 7-oxabicyclo[2.2.1]heptyl derivatives into rare monosaccharides, carbasugars, into a new doubly-branched imino-dideoxy ...
Formation of racemic pentose-2,4-bisphosphates is demonstrated, starting from glycolaldehyde phosphate and glyceraldehyde-2-phosphate, and induced by mixed valence double layer metal hydroxide minerals. The reactions proceed from dil. aq. reactant solns. ( ...
