Adenosine Triphosphatase Associated with Adenosine Triphosphate-Dependent Deoxyribonuclease

Adenosine triphosphate-dependent deoxyribonuclease in Bacillus subtilis.

Studies on Myofibrillar Adenosine Triphosphatase with Calcium-free Adenosine Triphosphate.

It has been reported by several groups of workers that incubation of the relaxing factor granar of muscle with magnesium and adenosine triphosphate results in the formation of a soluble relaxing substance capable of inhibiting the magnesium-activated adenosine triphosphatase activity of myofibrils or actomyosin (3-6) and the contraction of single glycerinated muscle fibers (7). In addition, Uri...

An Adenosine Triphosphate-dependent Deoxyribonuclease from Hemophilus influemae

The ATP-dependent DNase of Hemophilus injfuenzae Rd acts as a DNA-dependent ATPase which splits ATP into ADP and inorganic phosphate in the presence of magnesium ions and DNA. The apparent K, for ATP in the ATPase reaction is 0.18 mM. Approximately 40 ATP molecules are utilized for each DNA phosphodiester bond cleaved. All of the common ribose and deoxyribose nucleoside 5’-triphosphates can rep...

Adenosine Triphosphate-dependent Taurocholate

Transport systems involved in uptake and biliary secretion of bile salts have been extensively studied in rat liver; however, little is known about these systems in the human liver. In this study, we investigated taurocholate (TC) transport in canalicular and basolateral plasma membrane vesicles isolated from 15 human livers (donor age 6-64 yr). ATP stimulated the uptake ofTC into both canalicu...

The magnesium ion-dependent adenosine triphosphatase of myosin. Two-step processes of adenosine triphosphate association and adenosine diphosphate dissociation.

The kinetics of protein-fluorescence change when rabbit skeletal myosin subfragment 1 is mixed with ATP or adenosine 5'-(3-thiotriphosphate) in the presence of Mg(2+) are incompatible with a simple bimolecular association process. A substrate-induced conformation change with DeltaG(0)<-24kJ.mol(-1) (i.e. DeltaG(0) could be more negative) at pH8 and 21 degrees C is proposed as the additional ste...