, Volume 117, Issue 1, pp 11-21

Electron microscopic visualisation of the 5S rRNA-YL3 complex from Saccharomyces cerevisiae

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Abstract

The complex comprising 5S ribosomal RNA and the ribosomal protein YL3 (5S rRNP) was isolated from yeast (Saccharomyces cerevisiae), and positively contrasted preparations were imaged by transmission electron microscopy. The overall dimensions of the 5S rRNP complex in the micrographs were 10 nm by 6 min. Three predominant projections were selected from several hundred putative particles for digitisation and computer averaging to yield two-dimensional constructions with reproducible spatial resolutions exceeding 2 run. The enhanced projection images were compatible with structural models of this complex based on biochemical studies.