Publication Date:
1998-02-21
Description:
Activation of the protein p70s6k by mitogens leads to increased translation of a family of messenger RNAs that encode essential components of the protein synthetic apparatus. Activation of the kinase requires hierarchical phosphorylation at multiple sites, culminating in the phosphorylation of the threonine in position 229 (Thr229), in the catalytic domain. The homologous site in protein kinase B (PKB), Thr308, has been shown to be phosphorylated by the phosphoinositide-dependent protein kinase PDK1. A regulatory link between p70s6k and PKB was demonstrated, as PDK1 was found to selectively phosphorylate p70s6k at Thr229. More importantly, PDK1 activated p70s6k in vitro and in vivo, whereas the catalytically inactive PDK1 blocked insulin-induced activation of p70s6k.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pullen, N -- Dennis, P B -- Andjelkovic, M -- Dufner, A -- Kozma, S C -- Hemmings, B A -- Thomas, G -- New York, N.Y. -- Science. 1998 Jan 30;279(5351):707-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Friedrich Miescher Institute, Maulbeerstrasse 66, CH-4058, Basel, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9445476" target="_blank"〉PubMed〈/a〉
Keywords:
3-Phosphoinositide-Dependent Protein Kinases
;
Amino Acid Sequence
;
Androstadienes/pharmacology
;
Animals
;
Binding Sites
;
Calcium-Calmodulin-Dependent Protein Kinase Type 4
;
Calcium-Calmodulin-Dependent Protein Kinases/metabolism
;
Catalysis
;
Cell Line
;
Enzyme Activation
;
Insulin/pharmacology
;
Insulin Antagonists/pharmacology
;
Molecular Sequence Data
;
Phosphorylation
;
Phosphothreonine/metabolism
;
Polyenes/pharmacology
;
Protein-Serine-Threonine Kinases/*metabolism
;
Proto-Oncogene Proteins/metabolism
;
Proto-Oncogene Proteins c-akt
;
Recombinant Proteins/metabolism
;
Ribosomal Protein S6 Kinases/*metabolism
;
Sirolimus
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
