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Formation of initiation complex with lambdamRNA in vitro
A Becarevic1, S Naono, J -C. Lelong
1Boris Kidrich Institut of Nuclear Sciences, Laboratory of Radiobiology-, Beograd, Yugoslavia
FEBS Letters
|December 18, 1970
Summary
The in vitro transcribed lambda DNA by E. coli RNA polymerase does not increase amino acid incorporation. However, it can initiate peptide bond synthesis with initiation factors A, B, and C.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Ribosome function is crucial for protein synthesis, requiring messenger RNA (mRNA) and initiation factors.
- Bacterial RNA polymerase synthesizes mRNA from DNA templates.
- Lambda DNA serves as a well-characterized template for in vitro transcription studies.
Purpose of the Study:
- To investigate the translational capabilities of lambda DNA transcribed in vitro.
- To determine if this transcribed product can support amino acid incorporation and peptide bond synthesis.
- To assess the role of initiation factors in the process.
Main Methods:
- In vitro transcription of native lambda DNA using purified E. coli RNA polymerase.
- Incubation of the transcribed product with ribosomes and initiation factors (A, B, C).
- Measurement of total amino acid incorporation and assessment of first peptide bond synthesis.
Main Results:
- The in vitro transcribed lambda DNA product did not stimulate overall amino acid incorporation.
- The transcribed product successfully programmed ribosomes for the synthesis of the first peptide bond.
- Initiation factors A, B, and C were essential for this initial peptide bond formation.
Conclusions:
- In vitro transcribed lambda DNA, while not supporting extensive protein synthesis, can initiate translation.
- Bacterial initiation factors are critical for the commencement of protein synthesis from this specific mRNA template.
- This suggests a potential limitation in the stability or accessibility of the transcribed RNA for complete translation.