Effect of thyroid hormone on the phosphorylation of 110k proteins and the activity of protein kinase NII of rat liver nucleoli

Saito, T.; Suzuki, N.; Hosoya, T.

Biochemistry International 16(5): 895-901

1988


ISSN/ISBN: 0158-5231
PMID: 3421987
Document Number: 308386
When rat liver nucleoli were incubated with [.gamma.-32P]ATP, it was found that 110k proteins were predominantly phosphorylated . The phosphorylation of 110k proteins was decreased by thyroidectomy to about 80% of the normal level and restored 12 h after the injection of triiodothyronine. The activity of nucleolar protein kinase NII which is responsible for phosphorylation of 110k proteins was also increased by about 20-50% after injecting triiodothyronine into thyroidectomized rats. The hormone-stimulated enhancement in the phosphorylation of 110k proteins and protein kinase NII in nucleoli were abolished within 1 h after an injection of cycloheximide, without any change in the amount of the proteins.

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