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[yoo-bik-wi-tin] /yuˈbɪk wɪ tɪn/
a small protein, present in all eukaryotic cells, that participates in the destruction of defective proteins and in the synthesis of new proteins.
Origin of ubiquitin
1985-90; ubiquit(ous) + -in1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for ubiquitin
  • Proteins are tagged for degradation by a small protein called ubiquitin.
  • The tagging reaction is catalyzed by enzymes called ubiquitin ligases.
British Dictionary definitions for ubiquitin


(biochem) a small polypeptide, found in most eukaryotic cells, that combines with other proteins to make them susceptible to degradation
Derived Forms
ubiquitination, noun
Word Origin
C20: from ubiquitous + -in
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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ubiquitin in Medicine

ubiquitin u·biq·ui·tin (yōō-bĭk'wĭ-tĭn)
A polypeptide found in all eukaryotic cells including plant cells that participates in a variety of cellular functions including protein degradation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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