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- W1711307584 abstract "Ribosomes are responsible for translating the information in messenger ribonucleic acids (mRNAs) to synthesise proteins that the cell needs to carry out its function. Protein synthesis begins with the 30S ribosomal subunit recruiting a mRNA with the help of an initiator transfer RNA and three initiation factors. Successful recruitment of the mRNA results in the formation of the 30S pre-initiation complex, which is followed by the joining of the 50S ribosomal subunit to form the 70S ribosome. Recent studies indicate the order in which the initiation factors bind and promote the steps in initiation complex formation. The formation of the pre-initiation/initiation complex is often the rate-limiting step during the process of translation, as it is influenced by a number of translational regulatory mechanisms. As a result, the process of initiation can play a significant role in gene expression.Key Concepts: Translation initiation is a key step for regulating gene expression.Initiation factors 1, 2 and 3 are essential proteins that promote the binding of the initiator tRNA to the 30S subunit P site and the joining of the 50S subunit.Initiation factors 1, 2 and 3 are critical for the positioning the mRNA in the correct reading frame for translation.Efficient requirement of mRNA by the 30S subunit depends on the Shine–Dalgarno sequence in the mRNA forming base pairs with the anti-Shine–Dalgarno sequence located at the 3′-end of 16S rRNA.Kinetic studies have shown the order in which initiation factors bind to the 30S subunit.Cryo-EM and crystallographic work have revealed the three-dimensional location of initiation factors on the 30S subunit and the 70S ribosome.Keywords:initiation factors;translation;Shine–Dalgarno sequence;ribosome;mRNA;tRNA" @default.
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- W1711307584 date "2014-08-15" @default.
- W1711307584 modified "2023-09-25" @default.
- W1711307584 title "Protein Synthesis Initiation in Bacteria" @default.
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- W1711307584 doi "https://doi.org/10.1002/9780470015902.a0000542.pub3" @default.
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