Paper Chase is a research database designed to offer abstracts of research articles published in journals that have a highly rated impact factor as determined by ISI Impact Factor and PageRank. Abstracts are organized by date, with the most recently published papers listed first. 

Paper Chase

The tails of ubiquitin precursors are ribosomal proteins whose fusion to ubiquitin facilitates ribosome biogenesis.

Nature. Mar 30, 1989;338(6214):394-401.
Finley D, Bartel B, Varshavsky A.

Department of Cellular and Molecular Physiology, Harvard Medical School, Boston, Massachusetts 02115.


Three of the four yeast ubiquitin genes encode hybrid proteins which are cleaved to yield ubiquitin and previously unidentified ribosomal proteins. The transient association between ubiquitin and these proteins promotes their incorporation into nascent ribosomes and is required for efficient ribosome biogenesis. These results suggest a novel 'chaperone' function for ubiquitin, in which its covalent association with other proteins promotes the formation of specific cellular structures.