Relationship between size of mRNA ribosomal binding site and initiation factor function

M A CanonacoC O Gualerzi


The rate and the extent of the binding of initiator fMet-tRNA(fMet) to 30S ribosomal subunits in the presence of IF1, IF2 and GTP is either inhibited or slightly stimulated by the presence of IF3 depending on whether the initiation triplet AUG or the polynucleotide poly(AUG) is used as template. To determine the length of the template required for the transition from the AUG- to the poly(AUG)-type of behavior in the presence of IF3, the ribosomal binding of fMet-tRNA was studied in response to AUG triplets extended on either the 5'- or the 3'-side by stretches of homo-oligonucleotides of different lengths. When the binding of fMet-tRNA was studied at equilibrium it was found that IF3 no longer inhibits the amount of ternary complex formed if AUG is extended either 10 nucleotides on the 5'- or 35-40 nucleotides on the 3'-side. When the initial rate of ternary complex formation is considered, shorter extensions (4 nucleotides on the 5'-side or 20-30 nucleotides on the 3'-side) are sufficient to elicit a substantial stimulation by IF3. These results are discussed in relation to the mechanism of action of the initiation factors in the selection of the initiation region of the mRNA by ribosomes.


Jun 1, 1978·Proceedings of the National Academy of Sciences of the United States of America·J J DunnF W Studier
Jan 20, 1985·Journal of Molecular Biology·C W Kang, C R Cantor
Mar 1, 1974·Proceedings of the National Academy of Sciences of the United States of America·S D BernalT Nakamoto
Oct 8, 1974·Biochemical and Biophysical Research Communications·S D BernalT Nakamoto
May 11, 1982·Nucleic Acids Research·G D StormoL M Gold


Sep 1, 1988·Proceedings of the National Academy of Sciences of the United States of America·R CalogeroC O Gualerzi
Jan 30, 2020·PLoS Biology·Daria S VinogradovaPohl Milón

Related Concepts

tRNA, formylmethionine-
Alkalescens-Dispar Group
Peptide Chain Initiation, Translational
Peptide Initiation Factors
Poly(A) Tail
RNA, Transfer, Amino Acyl
RNA, Transfer, Initiator

Trending Feeds


Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Synthetic Genetic Array Analysis

Synthetic genetic arrays allow the systematic examination of genetic interactions. Here is the latest research focusing on synthetic genetic arrays and their analyses.

Congenital Hyperinsulinism

Congenital hyperinsulinism is caused by genetic mutations resulting in excess insulin secretion from beta cells of the pancreas. Here is the latest research.

Neural Activity: Imaging

Imaging of neural activity in vivo has developed rapidly recently with the advancement of fluorescence microscopy, including new applications using miniaturized microscopes (miniscopes). This feed follows the progress in this growing field.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Epigenetic Memory

Epigenetic memory refers to the heritable genetic changes that are not explained by the DNA sequence. Find the latest research on epigenetic memory here.

Cell Atlas of the Human Eye

Constructing a cell atlas of the human eye will require transcriptomic and histologic analysis over the lifespan. This understanding will aid in the study of development and disease. Find the latest research pertaining to the Cell Atlas of the Human Eye here.

Femoral Neoplasms

Femoral Neoplasms are bone tumors that arise in the femur. Discover the latest research on femoral neoplasms here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.