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3 edition of Phosphorylation of rat liver ribosomal proteins found in the catalog.

Phosphorylation of rat liver ribosomal proteins

Charles Eil

Phosphorylation of rat liver ribosomal proteins

by Charles Eil

  • 8 Want to read
  • 19 Currently reading

Published .
Written in English


Edition Notes

Statementby Charles Eil.
Classifications
LC ClassificationsMicrofilm 50071 (Q)
The Physical Object
FormatMicroform
Paginationvii, 129 p.
Number of Pages129
ID Numbers
Open LibraryOL2161278M
LC Control Number88890214

  The best-characterized downstream effectors of mTOR include two parallel signaling pathways involved in translational control: that of the ribosomal protein S6 kinase (S6K), and that of the eukaryotic initiation factor 4E (eIF4E)-binding protein (4E-BP1, 4E-BP2 or 4E-BP3). mTOR-dependent phosphorylation of S6K leads to activation of S6K, whereas that of 4E-BP1 results in dissociation of . Purchase Protein Phosphorylation, Part A, Volume - 1st Edition. Print Book & E-Book. ISBN , Xenopus Ribosomal Protein S6 Kinase II. H.A. Lane and G. Thomas, Purification and Properties of Mitogen-Activated S6 Kinase from Rat Liver and 3T3 Cells. J.-C. Labbe, J.-C. Cavadore.

[55] Phosphorylation of ribosomal proteins: preparation of rat liver ribosomal protein kinases. Assay of the phosphorylation of ribosomal subunit proteins. Assay of the function of phosphorylated ribosomes. ,,, DOI: /(74) N. Narayanan, Jacob Eapen. Protein synthesis by rat cardiac muscle myofibkils. The phosphorylation of rat liver ribosomal proteins was increased by an order of magnitude during liver regeneration. A large amount of radioactivity was associated with preparations of liver.

Ruvinsky I, Sharon N, Lerer T, Cohen H, Stolovich-Rain M, Nir T, Dor Y, Zisman P, Meyuhas O. Ribosomal protein S6 phosphorylation is a determinant of cell size and glucose homeostasis. Genes Dev. Crossref, Medline, ISI, Google Scholar. S6 phosphorylation in fetal and adult rat livers. Two-dimensional gel electrophoresis was performed using 40 S ribosomal proteins prepared from livers taken from an uninjected adult rat (Adult.


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Phosphorylation of rat liver ribosomal proteins by Charles Eil Download PDF EPUB FB2

We have shown that some rat liver ribosomal proteins may be phosphorylated in vivo and in vitro, especially on serine residues and that this phosphorylation is stimulated in vitro by cyclic 3', 5'-AMP at physiological doses in the range of to M.

Half stimulation is produced at 5 X M. by:   The chapter describes techniques devised (or adapted) for the preparation of rat liver ribosomal protein kinases, for the assay of the phosphorylation of the proteins of ribosomal subunits, for analysis of the product of the reaction, for assay of ribosomal phosphoprotein phosphatase, and for the comparison of the function of phosphorylated and nonphosphorylated : Charles Eil, Ira G.

Wool. and a kinase present in rat liver microsomal superna- tant. Although phosphorylation of microsomal pro- teins in some tissues has already been reported, to our knowledge, it is the first time that phosphorylation of ribosomal proteins has been shown.

Ribosomal proteins play. The pancreatic hormone, glucagon, stimulates the net uptake of inorganic 32 P in vivo into rat liver and its incorporation into proteins of microsomes, mitochondrial membranes, and lysosomes.

Incorporation into cytosolic proteins was enhanced only slightly by glucagon. More than 95% of the protein-bound phosphate is present as by: Subsequent chapters focus on the role of histone phosphorylation in cell division; histone phosphorylation and regulation of nuclear function; and protein phosphorylation in retinal photoreceptors.

The final chapter is devoted to acetylation of nuclear proteins in rat testis. This book should be a valuable resource for biochemists. Phosphorylation of ribosomal protein S6, located in the 40 S subunit, is thought to be required for the translation of a subset of mRNAs that contain a 5′-oligopyrimidine tract at their transcriptional start sites (5′-terminal oligopyrimidine (5′-TOP) 1 mRNAs) (8).

5′-TOP mRNAs may number as few as –, but they can account for 20–30% of total cellular mRNA. The regulation of rat liver S-adenosylmethionine synthetase (AdoMet synthetase), a key enzyme in methionine metabolism, by protein kinase C (PKC) phosphorylation has been studied.

Both enzyme forms, tetramer and dimer, are phosphorylated by. Two rat liver cytosol protein kinases catalyze phosphorylation of a number of proteins of the 40 S and of the 60 S ribosomal subunits (5, 12). In an accompanying paper we characterized the reaction catalyzed by the enzymes and determined the struc- ture of the product (12).

Phosphorylation of rpS6 was first discovered during liver regeneration (Gressner and Wool ), and later on in response to numerous agents and alterations in the cellular milieu (for review, see Chan and Wool ).

It is found that within minutes after female rats are treated with ethionine (E), the phosphorylation of ribosomal protein S6 can be observed. This phosphorylation persists until 2 h following E administration when it is gradually lost.

The phosphate loss is correlated with a marked increase in liver cAMP. The objective of this research was to determine the role of acidic ribosomal protein (ARP) phosphorylation in translation.

Ribosomes (Rbs) from germinated maize (Zea mays L.) axes had four ARP bands within to isoelectric points when analyzed by isoelectric focusing. Two of these bands disappeared after alkaline phosphatase hydrolysis. Cyclic Nucleotides, Protein Phosphorylation, and the Regulation of Function in Nervous Tissue Studies of the cAMP Receptor and of the cAMP Dependent Phosphorylation of Ribosomal Protein Phosphorylation of RNA-Polymerase in E.

Coli and Rat Liver Phosphorylation of Nuclear Proteins at Times of Gene Activation. Eil C, Wool IG. Phosphorylation of rat liver ribosomal subunits: partial purification of two cyclic AMP activated protein kinases. Biochem Biophys Res Commun.

Jun 4; 43 (5)– Gressner AM, Wool IG. Influence of glucagon and cyclic adenosine 3':5'-monophosphate on the phosphorylation of rat liver ribosomal protein S6. ENDOGENOUS PHOSPHORYLATION OF RIBOSOMAL PROTEINS FROM MEMBRANE-FREE RAT LIVER POLYSOMES A.

GENOT and J. REBOUD Laboratoire de Biochimie Kdicale, UniversitC de Lyon and Y. CENATIEMPO and A. COZZONE Laboratoire de Biologic Mokdaire, Universitd de Lyon, 43 Bd du II Novembre, F Villeurbanne, France. proteins of rat liver were phosphorylated in vivo, on serine residues and that isolated ribosomes of rat liver could also be phosphorylated in vitro by ATP and a kinase from microsomal supernatant of rat liver.

ONLY one rat liver ribosomal protein (S6) is phosphorylated in vivo hepatic regeneration the phosphorylation of S6 is increased by an order of magnitude, and derivatives are generated (in.

A trypsin-activated protein kinasc has been isolated from rat liver using a peptide analogue of ribosomal protein S6 as a substrate in kinase assays. The structure of the peptide, Arg-Arg-Leu-Ser-Ser-Leu-Arg-Ala, was based on a region of S6 containing both an insulin.

Phosphorylation of rat liver ribosomal subunits: Partial purification of two cyclic AMP activated protein kinases. Biochemical and Biophysical Research Communications43 (5), Hepatic ribosomal protein S6 phosphorylation in fetal and adult rat liver. Our prior studies showed that fetal hepatocyte proliferation in vivo is not dependent on hyperphosphorylation of ribosomal protein S6.

However, we did find that hepatic S6 is hyperphosphorylated in. Gressner AM, Wool IG. The stimulation of the phosphorylation of ribosomal protein S6 by cycloheximide and puromycin. Biochem Biophys Res Commun.

Oct 23; 60 (4)– Gressner AM, Wool IG. Influence of glucagon and cyclic adenosine 3':5'-monophosphate on the phosphorylation of rat liver ribosomal protein S6. MODIFICATION of ribosomal proteins has been suggested as a mechanism controlling protein biosynthesis1. In vivo and in vitro phosphorylation of eukaryotic ribosomal proteins .The phosphorylation of ribosomal protein S6 is thought to be required for biosynthesis of the cell's translational apparatus, a critical component of cell growth and proliferation.

We have studied the signal transduction pathways involved in hepatic S6 phosphorylation during late gestation in the rat.Phosphorylation of ribosomal proteins: preparation of rat liver ribosomal protein kinases. Assay of the phosphorylation of ribosomal subunit proteins.

Assay of the function of phosphorylated ribosomes.