Abstract. Biotransformations are chemical reactions carried out by microorganisms on organic substrates. can be regio-, chemo-, stereo- and enantio-selective. Bioreductions of great interest to the food pharmaceutical industries as they help reduce costs impacts environment. In this work, following biotransformations chalcones were performed: (2E)-1-(4-hydroxy-phenyl)-3-(2-methoxy-phenyl)-prop-...

Crystals of 5-hydroxy-6-methyl-2-pyridone, (I), grown from a variety of solvents, are invariably trigonal (space group R3); these are 5-hydroxy-6-methyl-2-pyridone acetone 0.1667-solvate, C(6)H(7)NO(2)·0.1667C(3)H(6)O, (Ia), and 6-methyl-5-hydroxy-2-pyridone propan-2-ol 0.1667-solvate, C(6)H(7)NO(2)·0.1667C(3)H(8)O, (Ib), and the forms from methanol, (Ic), water, (Id), benzonitrile, (Ie), and b...

Nicotine, a major toxic alkaloid in tobacco wastes, is degraded by bacteria, mainly via pyridine and pyrrolidine pathways. Previously, we discovered a new hybrid of the pyridine and pyrrolidine pathways in Agrobacterium tumefaciens S33 and characterized its key enzyme 6-hydroxy-3-succinoylpyridine (HSP) hydroxylase. Here, we purified the nicotine dehydrogenase initializing the nicotine degradat...

6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK) belongs to a class of catalytic enzymes involved in phosphoryl transfer and is a new target for the development of novel antimicrobial agents. In the present study, the fundamental consideration is to view the overall structure of HPPK as a network of interacting residues and to extract the most cooperative collective motions that defin...

Comparison of the crystallographic and NMR structures of 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK) suggests that the enzyme may undergo significant conformational change upon binding to its first substrate, ATP. Two of the three surface loops (loop 2 and loop 3) accounting for most of the conformational differences appear to be confined by crystal contacts, raising questions ab...

In many species, older males are often preferred mates because they carry "good" genes that account for their viability. In some animals, including mice, which rely heavily on chemical communication, there is some indication that an animal's age can be determined by its scent. In order to identify the attractants in aged male mouse urine, chemical and behavioral studies were performed. We herei...

<p>The Majapahit plant is commonly found in Indonesia but rarely used due to a lack of information about its potential. One the secondary metabolites this are flavonoids. Therefore, study aims determine distribution flavonoid compounds plant, particularly their potential as anticancer activty. Leaf material from plants was extracted using maceration technique, while extract were identifie...