Phosphorylation of serine 833 in cytoplasmic domain of low density lipoprotein receptor by a high molecular weight enzyme resembling casein kinase II - PubMed (original) (raw)

Comparative Study

. 1987 Jan 25;262(3):1344-51.

Free article

Comparative Study

Phosphorylation of serine 833 in cytoplasmic domain of low density lipoprotein receptor by a high molecular weight enzyme resembling casein kinase II

A Kishimoto et al. J Biol Chem. 1987.

Free article

Abstract

A soluble protein kinase that phosphorylates the last serine residue (Ser-833) in the cytoplasmic domain of the low density lipoprotein (LDL) receptor was purified about 1300-fold from the cytosol of bovine adrenal cortex. The LDL receptor kinase shared several properties with casein kinase II: use of either GTP or ATP; phosphorylation of a typical casein kinase II recognition sequence in the LDL receptor (a serine followed by a cluster of three negatively charged amino acids); and inhibition by heparin. The LDL receptor kinase differed from classic casein kinase II in the following respects: its apparent molecular weight on gel filtration was approximately 500,000 as opposed to the usual molecular weight of 130,000 for casein kinase II; its affinity for the LDL receptor (apparent Km approximately 5 nM) was much greater than its affinity for casein (approximately 10 microM); and its activity was inhibited by polylysine, an agent that stimulates casein kinase II. The physiologic role of this unusual kinase, if any, is unknown.

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