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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Selective ubiquitination of calmodulin by UBC4 and a putative ubiquitin protein ligase (E3) from Saccharomyces cerevisiae.

A putative ubiquitin protein ligase (E3-CaM) which cooperates with UBC4 in selectively ubiquitinating calmodulin has been partially purified from Saccharomyces cerevisiae. Ca2+ was required for this activity and monoubiquitinated calmodulin was the main product of the reaction. The apparent Km of E3-CaM for calmodulin was approximately 1 microM which is of the same order of magnitude as the concentration of calmodulin in yeast cells. Proteins which are good substrates for other E3s (E3 alpha or E3-R) were not ubiquitinated by E3-CaM. Lower but significant activities of E3-CaM were observed when UBC1 replaced UBC4.[1]


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