Abstract
Ribosomes are ribonucleoprotein nanoparticles synthesizing all proteins in living cells. The function of the ribosome is to translate the genetic information encoded in a nucleotide sequence of mRNA into the amino acid sequence of a protein. Each translation step (occurring after the codon-dependent binding of the aminoacyl-tRNA with the ribosome and mRNA) includes (i) the transpeptidation reaction and (ii) the translocation that unidirectionally drives the mRNA chain and mRNA-bound tRNA molecules through the ribosomal intersubunit space; the latter process is driven by the free energy of the chemical reaction of transpeptidation. Thus, the translating ribosome can be considered a conveying protein-synthesizing molecular machine. In this review we analyze the role of ribosomal intersubunit mobility in the process of translocation.
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