Phosphorylation of five aminoacyl-tRNA synthetases in reticulocytes and identification of the protein kinases phosphorylating threonyl-tRNA synthetase from rat liver

Conference · Thu May 01 04:00:00 EDT 1986 · Fed. Proc., Fed. Am. Soc. Exp. Biol.; (United States)

OSTI ID:5207972

Pendergast, A M; Traugh, J A

Five aminoacyl-tRNA synthetases in the high molecular weight complex were phosphorylated in rabbit reticulocytes following labeling with /sup 32/P. The five synthetases phosphorylated were the glutamyl-, glutaminyl-, lysyl-, aspartyl- and methionyl-tRNA synthetases. In addition, a 37,000 dalton protein, associated with the synthetase complex and tentatively identified as casein kinase I, was also phosphorylated in intact cells. Phosphoamino acid analysis of the proteins indicated all of the phosphate was on seryl residues. Incubation of reticulocytes with /sup 32/P in the presence of 8-bromo-cAMP and o, the 3-isobutyl-1-methylxanthine resulted in a six-fold increase in phosphorylation of the glutaminyl-tRNA synthetase, a two-fold increase in phosphorylation of the aspartyl-tRNA synthetase, and a 50 to 60% decrease in phosphorylation of the glutamyl-, methionyl- and lysyl-tRNA synthetases and the M/sub r/ 37,000 protein. When the site(s) on the glutaminyl-tRNA synthetase phosphorylated in response to 8-bromo-cAMP was analyzed by two-dimensional tryptic phosphopeptide mapping, a single phosphopeptide was observed which was identical to that obtained in vitro upon phosphorylation with the cAMP-dependent protein kinase. Also, the authors identify here, the protein kinases phosphorylating threonyl-tRNA synthetase from rat liver. They are protease activated kinase I, the cAMP-dependent protein kinase and protein kinase C.

• Research Organization: Univ. of California, Riverside
• OSTI ID: 5207972
• Report Number(s): CONF-8606151-
• Conference Information: Journal Name: Fed. Proc., Fed. Am. Soc. Exp. Biol.; (United States) Journal Volume: 45:6
• Country of Publication: United States
• Language: English

Related Subjects

550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
AMINO ACID SEQUENCE
AMP
ANIMALS
AROMATICS
AZAARENES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL MATERIALS
BLOOD
BLOOD CELLS
BODY
BODY FLUIDS
CHEMICAL REACTIONS
DAYS LIVING RADIOISOTOPES
DIGESTIVE SYSTEM
ENZYMES
ERYTHROCYTES
GLANDS
HETEROCYCLIC COMPOUNDS
ISOTOPE APPLICATIONS
ISOTOPES
LIGASES
LIGHT NUCLEI
LIVER
MAMMALS
MATERIALS
MOLECULAR STRUCTURE
MOLECULAR WEIGHT
NUCLEI
NUCLEIC ACIDS
NUCLEOTIDES
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANS
PHOSPHORUS 32
PHOSPHORUS ISOTOPES
PHOSPHORUS-GROUP TRANSFERASES
PHOSPHORYLATION
PHOSPHOTRANSFERASES
PURINES
RABBITS
RADIOISOTOPES
RATS
RETICULOCYTES
RNA
RODENTS
TRACER TECHNIQUES
TRANSFER RNA
TRANSFERASES
VERTEBRATES
XANTHINES