a small protein, present in all eukaryotic cells, that participates in the destruction of defective proteins and in the synthesis of new proteins.

1985–90; ubiquit(ous) + -in1

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World English Dictionary
ubiquitin (juːˈbɪkwɪtɪn)
biochem a small polypeptide, found in most eukaryotic cells, that combines with other proteins to make them susceptible to degradation
[C20: from ubiquitous + -in]

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American Heritage
Medical Dictionary

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
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Example sentences for ubiquitin
Proteins are tagged for degradation by a small protein called ubiquitin.
The tagging reaction is catalyzed by enzymes called ubiquitin ligases.
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