scholarly journals The rate-limiting step of the protamine-induced adenosine triphosphatase activity of adenosine triphosphate-G-actin

1979 ◽  
Vol 183 (2) ◽  
pp. 475-476 ◽  
Author(s):  
A Ferri ◽  
E Magri ◽  
E Grazi
Keyword(s):  
Atpase Activity ◽  
Adenosine Triphosphate ◽  
Adenosine Triphosphatase ◽  
Adenosine Triphosphatase Activity ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Rate Limiting

The release of Pi from the Pi-G-actin-ADP complex is the rate-limiting step in the ATPase activity that is shown by ATP-G-actin in the presence of protamine.

Rate-limiting step in the actomyosin adenosine triphosphatase cycle

Biochemistry ◽  
1984 ◽  
Vol 23 (7) ◽  
pp. 1555-1563 ◽  
Author(s):  
L. A. Stein ◽  
P. B. Chock ◽  
E. Eisenberg
Keyword(s):  
Adenosine Triphosphatase ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Rate Limiting

Product Release is Not the Rate-Limiting Step during Cytochalasin B-Induced ATPase Activity of Monomeric Actin

1991 ◽  
Vol 46 (1-2) ◽  
pp. 139-144 ◽  
Author(s):  
Peter Dancker ◽  
Lore Hess ◽  
Karl Ritter
Keyword(s):  
Steady State ◽  
Atpase Activity ◽  
Rate Constant ◽  
Cytochalasin B ◽  
Single Turnover ◽  
Rate Limiting Step ◽  
Hydrolysis Products ◽  
Limiting Step ◽  
Rate Limiting ◽  
Hydrolysis Of

Abstract Under conditions where cytochalasin B induces ATPase activity of monomeric actin (0.3 mᴍ MgCl2, 1 mᴍ EGTA , 30 (μᴍ cytochalasin B, 1 mᴍ ATP) the rate constant of the ex­change of actin-bound ε-ATP for free ATP is about 4 -6 times faster than steady state ATPase activity. When a stoichiometric ATP -actin complex is extracted with PCA (single turnover ex­periment) the apparent rate constant of Pi generation is not faster than steady state ATPase activity. -The experiments suggest that the hydrolysis of actin-bound ATP and not the subse­quent release of hydrolysis products is rate-limiting during cytochalasin-induced ATPase activi­ty of actin.

Ornithine Decarboxylase Activity in Cultured Endothelial Cells Stimulated by Serum, Thrombin and Serotonin

1978 ◽  
Vol 39 (02) ◽  
pp. 496-503 ◽  
Author(s):  
P A D’Amore ◽  
H B Hechtman ◽  
D Shepro
Keyword(s):  
Endothelial Cells ◽  
Ornithine Decarboxylase ◽  
Decarboxylase Activity ◽  
Aortic Endothelial Cells ◽  
Ornithine Decarboxylase Activity ◽  
Rate Limiting Step ◽  
Bovine Aortic Endothelial Cells ◽  
Limiting Step ◽  
Rate Limiting ◽  
Serum Serotonin

SummaryOrnithine decarboxylase (ODC) activity, the rate-limiting step in the synthesis of polyamines, can be demonstrated in cultured, bovine, aortic endothelial cells (EC). Serum, serotonin and thrombin produce a rise in ODC activity. The serotonin-induced ODC activity is significantly blocked by imipramine (10-5 M) or Lilly 11 0140 (10-6M). Preincubation of EC with these blockers together almost completely depresses the 5-HT-stimulated ODC activity. These observations suggest a manner by which platelets may maintain EC structural and metabolic soundness.

Dynamics of hepatic and peripheral insulin effects suggest common rate-limiting step in vivo

Diabetes ◽  
1993 ◽  
Vol 42 (2) ◽  
pp. 296-306 ◽  
Author(s):  
D. C. Bradley ◽  
R. A. Poulin ◽  
R. N. Bergman
Keyword(s):  
Rate Limiting Step ◽  
Limiting Step ◽  
Rate Limiting
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