Characterization of wheat germ protein synthesis initiation factor eIF-4C and comparison of eIF-4C from wheat germ and rabbit reticulocytes.
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Characterization of wheat germ protein synthesis initiation factor eIF-4C and comparison of eIF-4C from wheat germ and rabbit reticulocytes.
Eukaryotic protein synthesis initiation factor (eIF)-4C was purified from wheat germ and the molecular weight was calculated to be approximately 19,000 by SDS-polyacrylamide gel electrophoresis. A similar molecular weight was determined by gel filtration chromatography indicating that wheat germ eIF-4C is functional as a single polypeptide chain. An efficient in vitro translation system depende...
متن کاملPurification and characterization of protein synthesis initiation factors eIF-1, eIF-4C, eIF-4D, and eIF-5 from rabbit reticulocytes.
Protein synthesis initiation factors eIF-1, eIF-4C, eIF4D, and eIF-5 were isolated and purified from rabbit reticulocyte lysates. Crude initiation factors from the high salt ribosomal extract were separated by ammonium sulfate precipitation into Fraction A (0 to 40% saturation) and Fraction BC (40 to 70% saturation). Fraction BC was separated by gel filtration on Sephadex G-100 into two fractio...
متن کاملWheat Germ eIF 2 and CoeIF 2
A factor that binds Met-tRNAF’ in a ternary complex (eucaryotic initiation factor (eIF2)) and an auxiliary component that strongly stimulates the activity of the binding factor (CoeIF2) have been purified from extracts of wheat germ. The molecular weights of the two factors, as determined by glycerol gradient centrifugation and sodium dodecyl sulfate gel electrophoresis, are 88,000 and 20,000, ...
متن کاملFactors from wheat germ that enhance the activity of eukaryotic initiation factor eIF-2. Isolation and characterization of Co-eIF-2 alpha.
Two factors have been isolated from wheat germ that enhance the ability of initiation factor 2(eIF-2) to form a ternary complex with GTP and Met-tRNAf. One of these factors, Co-eIF-2 beta, is a monomeric protein with a molecular weight of approximately 83,000 (Lax, S. R., Osterhout, J.J., and Ravel, J.M. (1982) J. Biol. Chem. 257, 8233-8237). The purification and properties of Co-eIF-2 alpha ar...
متن کاملProtein synthesis in rabbit reticulocytes: characteristics of CO-eIF-2 protein complex.
A high molecular weight reticulocyte protein factor, named Co-eIF-2, contains Co-eIF-2A, Co-eIF-2B, and Co-eIF-2C activities and stimulates Met-tRNAf binding to eIF-2 both in the presence and absence of Mg2+. Some characteristics of this stimulation in the absence of Mg2+ are: (1) Stimulation is most pronounced at low eIF-2 levels. (2) Stimulation is partially resistant to heat and NEM treatmen...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1993
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(19)74544-x