A new aspect of hydrolysis of metal ions: The hydrogen-oxide bridging ligand (H3O 2 − )

2005 ◽  
pp. 1-28 ◽  
Author(s):  
Michael Ardon ◽  
Avi Bino
Keyword(s):  
Metal Ions ◽  
Bridging Ligand ◽  
Hydrogen Oxide ◽  
Hydrolysis Of

Hydrolysis of 5′,5′-Tri- or Tetraphosphate-mRNA 5′-cap Analogs Promoted by Cu2+or Zn2+Metal Ions

2011 ◽  
Vol 30 (2) ◽  
pp. 135-148 ◽  
Author(s):  
Alicja Stachelska-Wierzchowska ◽  
Zbigniew J. Wieczorek
Keyword(s):  
Metal Ions ◽  
Hydrolysis Of

scholarly journals Hydrolysis of Metal Ions in Cation Exchange Resin

1961 ◽  
Vol 82 (12) ◽  
pp. 1650-1653
Author(s):  
Hiroyuki TSUBOT ◽  
Hidetake KAKIHANA
Keyword(s):  
Metal Ions ◽  
Cation Exchange ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Hydrolysis Of

scholarly journals The Hydrolysis of Pyridylmethyl Phosphates and the Catalysis of Metal Ions

1967 ◽  
Vol 40 (11) ◽  
pp. 2724-2724 ◽  
Author(s):  
Yukito Murakami ◽  
Makoto Takagi
Keyword(s):  
Metal Ions ◽  
Hydrolysis Of

scholarly journals Pectin methylesterase, metal ions and plant cell-wall extension. Hydrolysis of pectin by plant cell-wall pectin methylesterase

1991 ◽  
Vol 279 (2) ◽  
pp. 343-350 ◽  
Author(s):  
J Nari ◽  
G Noat ◽  
J Ricard
Keyword(s):  
Cell Wall ◽  
Metal Ions ◽  
Plant Cell ◽  
Plant Cell Wall ◽  
Direct Interaction ◽  
Enzyme Reaction ◽  
Pectin Methylesterase ◽  
High Concentrations ◽  
Enzyme Molecules ◽  
Hydrolysis Of

The hydrolysis of p-nitrophenyl acetate catalysed by pectin methylesterase is competitively inhibited by pectin and does not require metal ions to occur. The results suggest that the activastion by metal ions may be explained by assuming that they interact with the substrate rather than with the enzyme. With pectin used as substrate, metal ions are required in order to allow the hydrolysis to occur in the presence of pectin methylesterase. This is explained by the existence of ‘blocks’ of carboxy groups on pectin that may trap enzyme molecules and thus prevent the enzyme reaction occurring. Metal ions may interact with these negatively charged groups, thus allowing the enzyme to interact with the ester bonds to be cleaved. At high concentrations, however, metal ions inhibit the enzyme reaction. This is again understandable on the basis of the view that some carboxy groups must be adjacent to the ester bond to be cleaved in order to allow the reaction to proceed. Indeed, if these groups are blocked by metal ions, the enzyme reaction cannot occur, and this is the reason for the apparent inhibition of the reaction by high concentrations of metal ions. Methylene Blue, which may be bound to pectin, may replace metal ions in the ‘activation’ and ‘inhibition’ of the enzyme reaction. A kinetic model based on these results has been proposed and fits the kinetic data very well. All the available results favour the view that metal ions do not affect the reaction through a direct interaction with enzyme, but rather with pectin.

scholarly journals Studies on the Hydrolysis of Metal Ions. 62. The Plutonyl Ion in Sodium Perchlorate Medium.

1975 ◽  
Vol 29a ◽  
pp. 333-344 ◽  
Author(s):  
Ulla Schedin ◽  
Harald A. Øye ◽  
Jon Årskog ◽  
Arne F. Andresen ◽  
J. T. Southern ◽  
...  
Keyword(s):  
Metal Ions ◽  
Sodium Perchlorate ◽  
Hydrolysis Of
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