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Article Abstract
Ribosomes are universally conserved enzymes that carry out protein biosynthesis. Bacterial and eukaryotic ribosomes, which share an evolutionarily conserved core, are thought to have evolved from a common ancestor by addition of proteins and RNA that bestow different functionalities to ribosomes from different domains of life. Recently, structures of the eukaryotic ribosome, determined by X-ray crystallography, have allowed us to compare these structures to previously determined structures of bacterial ribosomes. Here we describe selected bacteria- or eukaryote-specific structural features of the ribosome and discuss the functional implications of some of them.
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