Abstract
The beta-adrenergic receptor kinase mediates agonist-dependent phosphorylation
of beta-adrenergic receptors, which is thought to represent the first
step of homologous desensitization. We have expressed bovine and
human beta ARK1 in Sf9 cells and purified them to apparent homogeneity
in milligram quantities. The Km-values of the enzyme were 3.8 microM
for rhodopsin and 22 microM for ATP; the Vmax-value was 9.9 mol phosphate/mol
beta ARK/min. These data indicate that the two recombinant kinases
were at least as active as preparations previously obtained from
bovine brain. There were no differences in the functional activity
of human and bovine beta ARK.
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