title: Identity of the ubiquitous eukaryotic ring-shaped miniparticle.
abstract: Ring-shaped miniparticles with 110A outer diameter which stack up to to form tetrameric rectangular particles (110 X 150A) are ubiquitous in eukaryotic cells. This communication reviews the properties of these miniparticles and shows that the ring-shaped miniparticles are not high-Mr aminoacyl-tRNA synthetase complexes but are a recently recognized 19S RNP particle which represses cytoplasmic mRNA translation.
mesh_terms: D000818:Animals; D002477:Cells / Q000032:analysis*; D005057:Eukaryotic Cells / Q000032:analysis* / Q000648:ultrastructure; D006801:Humans; D012261:Ribonucleoproteins / Q000032:analysis*
chemical_list: D012261:Ribonucleoproteins