Our current view of the nucleolus has been shaped by the concept that the organization of this prominent compartment within the nucleus is primarily dictated by its function, the making of ribosome subunits. Whether ribosome biogenesis is framed by a dedicated nucleolar scaffold has remained unclear. In this issue of The EMBO Journal, Caudron-Herger and colleagues present evidence for a nucleol...

The scientific review considers the mechanisms of action cytoplasmic microRNAs, namely miRNA-mediated silencing, which is caused during initiation and post-initiation period translation. To write article, information was searched using Scopus, Web Science, MedLine, PubMed, Google Scholar, EMBASE, Global Health, Cochrane Library, CyberLeninka databases. It known that silencing translation occurs...

The genes encoding α- and β-type subunits of 20S proteasome core protease are integral components 26S complex in the ubiquitin-proteasome system (UPS). represents a catalytic particle that cleaves cytotoxic, denatured, damaged unwanted proteins an ATP/ubiquitin-dependent non-lysosomal pathway is known to impart thermotolerance model plants. In present study, we identified 67 (including 34 TaPA ...

We present a molecular-level model for the origin and evolution of the translation system, using a 3D comparative method. In this model, the ribosome evolved by accretion, recursively adding expansion segments, iteratively growing, subsuming, and freezing the rRNA. Functions of expansion segments in the ancestral ribosome are assigned by correspondence with their functions in the extant ribosom...

Ribosome assembly is an essential and conserved cellular process in eukaryotes that requires numerous assembly factors. The six-subunit UTPB complex is an essential component of the 90S precursor of the small ribosomal subunit. Here, we analyzed the molecular architecture of UTPB using an integrative structural biology approach. We mapped the major interactions that associate each of six UTPB p...

Ca2+ channels are voltage-gated ion present in the membrane of most excitable cells. The nomenclature for Ca2+channels was proposed by [127] and approved NC-IUPHAR Subcommittee on [70]. Most form hetero-oligomeric complexes. α1 subunit is pore-forming provides binding site(s) practically all agonists antagonists. 10 cloned α1-subunits can be grouped into three families: (1) high-voltage activat...

The large ribosomal subunit protein Rpl10p is required for subunit joining and 60S export in yeast. We have recently shown that Rpl10p as well as the cytoplasmic GTPase Lsg1p are required for releasing the 60S nuclear export adapter Nmd3p from subunits in the cytoplasm. Here, we more directly address the order of Nmd3p and Rpl10p recruitment to the subunit. We show that Nmd3p can bind subunits ...

Prior studies identified allosteric information pathways connecting functional centers in the large ribosomal subunit to the decoding center in the small subunit through the B1a and B1b/c intersubunit bridges in yeast. In prokaryotes a single SSU protein, uS13, partners with H38 (the A-site finger) and uL5 to form the B1a and B1b/c bridges respectively. In eukaryotes, the SSU component was spli...

In the present work, ribosomes assembled in bacterial cells in the absence of essential ribosomal protein L5 were obtained. After arresting L5 synthesis, Escherichia coli cells divide a limited number of times. During this time, accumulation of defective large ribosomal subunits occurs. These 45S particles lack most of the central protuberance (CP) components (5S rRNA and proteins L5, L16, L18,...

The structural understanding of eukaryotic translation lags behind that of translation on bacterial ribosomes. Here, we present two subnanometer resolution structures of S. cerevisiae 80S ribosome complexes formed with either one or two tRNAs and bound in response to an mRNA fragment containing the Kozak consensus sequence. The ribosomes adopt two globally different conformations that are relat...