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Purification and characterization of initiation factor IF-E2 from rabbit reticulocytes.

R Benne, C Wong, M Luedi

The Journal of Biological Chemistry

|December 10, 1976

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Rabbit reticulocyte initiation factor IF-E2, a complex of three polypeptides, binds to the 40S ribosomal subunit with methionyl-tRNA and GTP. Its components are essential for forming nascent initiation complexes.

Area of Science:

Molecular Biology
Protein Biochemistry
Ribosome Function

Background:

Protein synthesis initiation is a critical regulatory step in gene expression.
Specific initiation factors are required to assemble the ribosomal initiation complex.
Understanding the composition and function of these factors is key to elucidating translational control.

Purpose of the Study:

To isolate and characterize initiation factor IF-E2 from rabbit reticulocytes.
To determine the subunit composition and molecular weight of IF-E2.
To investigate the role of IF-E2 in the formation of the ternary complex and its binding to the 40S ribosomal subunit.

Main Methods:

Purification of IF-E2 using ammonium sulfate fractionation, DEAE-cellulose and phosphocellulose chromatography, and sucrose density gradient centrifugation.

Related Experiment Videos

Analysis of protein components by polyacrylamide gel electrophoresis in denaturing and nondenaturing buffers.

Radioactive labeling of IF-E2 via reductive alkylation or phosphorylation.

Assay of ternary complex formation with GTP and methionyl-tRNA.

Study of binding to the 40S ribosomal subunit using sucrose density gradient centrifugation.

Main Results:

IF-E2 purified to near homogeneity is a complex of three non-identical polypeptides (57,000, 52,000, and 36,000 Da) in a 1:1:1 stoichiometric ratio.
The factor's molecular weight was determined to be approximately 160,000 Da.
Radioactive labeling did not affect the factor's ability to form a ternary complex with GTP and methionyl-tRNA.
IF-E2 binding to the 40S ribosomal subunit requires all three components of the ternary complex.
All three polypeptide subunits of IF-E2 were found to be bound to nascent initiation complexes.

Conclusions:

Initiation factor IF-E2 is a heterotrimeric protein essential for the formation of translation initiation complexes.
All three subunits of IF-E2 are integral components of the functional initiation complex bound to the 40S ribosomal subunit.
The purified factor's functional integrity is maintained after in vitro labeling.