Abstract
Lateral L12-stalk (P1-stalk in Archaea, P1/P2-stalk in eukaryotes) is an obligatory morphological element of large ribosomal subunits in all organisms studied. This stalk is composed of the complex of ribosomal proteins L10(P0) and L12(P1) and interacts with 23S rRNA through the protein L10(P0). L12(P1)-stalk is involved in the formation of GTPase center of the ribosome and plays an important role in the ribosome interaction with translation factors. High mobility of this stalk puts obstacles in determination of its structure within the intact ribosome. Crystals of a two-domain N-terminal fragment of ribosomal protein L10(P0) from the archaeon Methanococcus jannaschii in complex with a specific fragment of rRNA from the same organism have been obtained. The crystals diffract X-rays at 3.2 A resolution.
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