Subscribe to RSS
© Georg Thieme Verlag Stuttgart · New York
Decreased Na,K-ATPase Activity by Glycation at the Catalytic Center
19 April 2007 (online)
The in vitro activity of Na,K-ATPase isolated from outer medulla of dog kidney was decreased in a dose- and time-dependent manner by interaction with 100 mM glucose 6-phosphate (G6P) during the first 8 h. In the subsequent 16 h no change in activity was observed. On the other hand, Amadori-products of the enzyme increased in a dose- and time-dependent manner by glycation up to 100 mM G6P during 24 h. The presence of 5 mM ATP in glycation experiments protected the enzyme activity but did not inhibit the formation of Amadori-products. These results were consistent with inhibition of the Na,K-ATPase activity by glycation of the amino groups located in the catalytic center of the molecule.
Glycation - Na,K-ATPase - Amadori-Products - Catalytic Center