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Molecular cloning and functional expression of a human cDNA encoding translation initiation factor 6
K Si1, J Chaudhuri, J Chevesich
1Department of Developmental and Molecular Biology, Albert Einstein College of Medicine of Yeshiva University, Jack and Pearl Resnick Campus, Bronx, NY 10461, USA.
Summary
Researchers purified eukaryotic translation initiation factor 6 (eIF6) and cloned its human gene. The recombinant protein
Area of Science:
- Molecular Biology
- Protein Biochemistry
Background:
- Eukaryotic translation initiation factor 6 (eIF6) regulates ribosome biogenesis by binding the 60S ribosomal subunit.
- eIF6 prevents premature 40S-60S ribosomal subunit association, a critical step in translation initiation.
Purpose of the Study:
- To develop a purification method for eIF6 from rabbit reticulocyte lysates.
- To immunochemically characterize eIF6 and clone its human cDNA.
- To express and verify the biochemical properties of recombinant human eIF6.
Main Methods:
- Purification of eIF6 from rabbit reticulocyte lysates.
- Generation of monospecific antibodies from immunized hen egg yolks.
- Cloning and expression of human eIF6 cDNA in Escherichia coli.
- Biochemical characterization of purified recombinant human eIF6.
Main Results:
- A procedure for purifying eIF6 was successfully established.
- Monospecific antibodies against rabbit eIF6 were generated.
- Human eIF6 cDNA (1.096-kb) encoding a 245-amino acid protein was cloned and expressed.
- Recombinant human eIF6 displayed biochemical properties similar to native mammalian eIF6.
- Homologues of human eIF6 were identified in yeast, fruit flies, and nematodes.
Conclusions:
- The study provides a method for eIF6 purification and characterization.
- Human eIF6 has been successfully cloned, expressed, and its biochemical properties confirmed.
- The identification of homologous sequences suggests a conserved role for eIF6 across diverse eukaryotic organisms.