scholarly journals Arsenite release on enzymic transformation of arsonomethyl substrate analogues: a potentially lethal synthesis by glycerol-3-phosphate dehydrogenase

1995 ◽  
Vol 310 (3) ◽  
pp. 983-988 ◽  
Author(s):  
E K Mutenda ◽  
M J Sparkes ◽  
H B F Dixon
Keyword(s):  
Alcohol Dehydrogenase ◽  
Rabbit Muscle ◽  
High Affinity ◽  
Good Substrate ◽  
Yeast Alcohol Dehydrogenase ◽  
Substrate Analogues ◽  
Glycerol 3 Phosphate Dehydrogenase ◽  
Alcohol Dehydrogenase 2 ◽  
In Cells

The isosteric arsenical analogue of glycerol 3-phosphate, 3,4-dihydroxybutylarsonic acid, is a good substrate for rabbit muscle glycerol-3-phosphate dehydrogenase. Its oxidation is accompanied by release of arsenite. This release seems to be due to a spontaneous elimination of arsenite by 3-oxoalkylarsonic acids, as it is also observed in (1) the oxidation of 3-hydroxypropylarsonic acid by yeast alcohol dehydrogenase, (2) treatment of 3,4-dihydroxybutylarsonic acid with periodate and (3) nonenzymic transamination of the glutamate analogue 2-amino-4-arsonobutyric acid. Enzymic formation of 3-oxoalkylarsonic acids in cells can therefore be lethal, as arsenite is poisonous to most organisms because of its high affinity for dithiols such as dihydrolipoyl groups.

scholarly journals Subunit conformation of yeast alcohol dehydrogenase.

1978 ◽  
Vol 253 (23) ◽  
pp. 8414-8419
Author(s):  
H. Jörnvall ◽  
H. Eklund ◽  
C.I. Brändén
Keyword(s):  
Alcohol Dehydrogenase ◽  
Yeast Alcohol Dehydrogenase

scholarly journals Mediation of interleukin-11-dependent biological responses by a soluble form of the interleukin-11 receptor

1996 ◽  
Vol 318 (2) ◽  
pp. 489-495 ◽  
Author(s):  
Julia KAROW ◽  
Keith R. HUDSON ◽  
Mark A. HALL ◽  
Ann B. VERNALLIS ◽  
Jacky A. TAYLOR ◽  
...  
Keyword(s):  
Biological Effects ◽  
Biological Response ◽  
Cytoplasmic Domain ◽  
Soluble Form ◽  
High Affinity ◽  
Biological Responses ◽  
Interleukin 11 ◽  
Biological Actions ◽  
In Cells

Interleukin-11 (IL-11) is a polyfunctional cytokine whose biological actions require a specific IL-11 receptor (IL-11R) and the transmembrane transducer gp130. Here we report the production of a soluble form of the murine IL-11R and demonstrate that it interacts with IL-11 ligand with high affinity. The affinity of IL-11 alone for gp130 is below the level of detection, but a complex of IL-11 and soluble IL-11R interacts with gp130 with high affinity. The addition of soluble IL-11R potentiates the effects of exogenous IL-11 in cells that are normally responsive to IL-11. A biological response to IL-11 can be reconstituted in BAF cells transfected with gp130 by addition of IL-11 and soluble IL-11R. These findings show that the cytoplasmic domain of the IL-11R is not required for the biological effects of IL-11 and that a complex of IL-11 and IL-11R mediates signalling by association with gp130.

scholarly journals Isomerization of an enzyme-coenzyme complex in yeast alcohol dehydrogenase-catalysed reactions

2003 ◽  
Vol 68 (2) ◽  
pp. 77-84 ◽  
Author(s):  
Vladimir Leskovac ◽  
Svetlana Trivic ◽  
Draginja Pericin
Keyword(s):  
Alcohol Dehydrogenase ◽  
Rate Constants ◽  
Equilibrium Constants ◽  
Kinetic Mechanism ◽  
Yeast Alcohol Dehydrogenase ◽  
Catalyzed Reactions ◽  
The Individual ◽  
Individual Rate ◽  
Catalyzed Oxidation

In this work, all the rate constants in the kinetic mechanism of the yeast alcohol dehydrogenase-catalyzed oxidation of ethanol by NAD+, at pH 7.0, 25 ?C, have been estimated. The determination of the individual rate constants was achieved by fitting the reaction progress curves to the experimental data, using the procedures of the FITSIM and KINSIM software package of Carl Frieden. This work is the first report in the literature showing the internal equilibrium constants for the isomerization of the enzyme-NAD+ complex in yeast alcohol dehydrogenase-catalyzed reactions.

scholarly journals Binding of coenzymes to yeast alcohol dehydrogenase

2010 ◽  
Vol 75 (2) ◽  
pp. 185-194 ◽  
Author(s):  
Vladimir Leskovac ◽  
Svetlana Trivic ◽  
Draginja Pericin ◽  
Mira Popovic ◽  
Julijan Kandrac
Keyword(s):  
Alcohol Dehydrogenase ◽  
Equilibrium Constants ◽  
Point Mutations ◽  
Free Energies ◽  
Wild Type ◽  
Wild Type Enzyme ◽  
Mutant Type ◽  
Yeast Alcohol Dehydrogenase ◽  
Internal Equilibrium ◽  
Individual Reaction

In this work, the binding of coenzymes to yeast alcohol dehydrogenase (EC 1.1.1.1) were investigated. The main criterions were the change in the standard free energies for individual reaction steps, the internal equilibrium constants and the overall changes in the reaction free energies. The calculations were performed for the wild type enzyme at pH 6-9 and for 15 different mutant type enzymes, with single or double point mutations, at pH 7.3. The abundance of theoretical and experimental data enabled the binding of coenzymes to enzyme to be assessed in depth.

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