NDLI: In situ phosphorylation of the alpha subunit of eukaryotic initiation factor 2 in reticulocyte lysates inhibited by heme deficiency, double-stranded RNA, oxidized glutathione, or the heme-regulated protein kinase.

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In situ phosphorylation of the alpha subunit of eukaryotic initiation factor 2 in reticulocyte lysates inhibited by heme deficiency, double-stranded RNA, oxidized glutathione, or the heme-regulated protein kinase.

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In situ phosphorylation of the alpha subunit of eukaryotic initiation factor 2 in reticulocyte lysates inhibited by heme deficiency, double-stranded RNA, oxidized glutathione, or the heme-regulated protein kinase.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	London, I. M. Ernst, V. Levin, D. H.
Abstract	Protein synthesis initiation in reticulocyte lysates is inhibited by heme deficiency, low levels of double-stranded RNA (dsRNA), oxidized glutathione (GSSG), or the purified kinase (HRI) that acts on the alpha polypeptide of eukaryotic initiation factor 2 (eIF-2alpha). The phosphoprotein profiles produced in lysates in response to these various conditions have been monitored directly in lysates after labeling for brief periods with pulses of [gamma-(32)P]ATP. The [(32)P]phosphoprotein profiles were analyzed by electrophoresis in sodium dodecyl sulfate/polyacrylamide slab gels under conditions in which the HRI and eIF-2alpha polypeptides were clearly distinguished. All four modes of inhibition produced a rapid phosphorylation of eIF-2alpha compared to control lysates, which displayed little or no phosphorylation of eIF-2alpha. In heme-deficient lysates, phosphorylation of eIF-2alpha occurred rapidly both before and after the shut-off of protein synthesis; the delayed addition of hemin to these lysates resulted in a decrease in the phosphorylation of eIF-2alpha and the subsequent restoration of protein synthesis. These data suggest that rapid turnover of phosphate occurs at the site(s) of eIF-2alpha phosphorylation. In lysates inhibited by heme deficiency, GSSG, or added HRI, the phosphorylation of eIF-2alpha was accompanied by the rapid in situ phosphorylation of HRI. The inhibition of initiation induced by dsRNA was accompanied by the phosphorylation of eIF-2alpha and a 67,000-dalton polypeptide but not HRI. These observations in situ indicate that (i) the phosphorylation of eIF-2alpha is the critical event in these inhibitions of protein chain initiation, and (ii) the phosphorylation of HRI is associated with its activation in heme deficiency.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	5
Volume Number	76
Language	English
Publisher	National Academy of Sciences
Publisher Date	1979-08-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Peptide Initiation Factors Metabolism Reticulocytes Adenosine Triphosphate Animals Glutathione Pharmacology Guanosine Triphosphate Heme Deficiency Hemin Kinetics Macromolecular Substances Phosphorylation Protein Kinases RNA Rabbits Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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