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Searching for a physiological partner of Ddi2 (DNA damage-inducible protein homolog 2) protein
 Kurfürst, Jaroslav ; Grantz Šašková, Klára (advisor) ; Vaněk, Ondřej (referee)
One of the most important cellular processes, essential not only for protein degradation, is the so called ubiquitin-proteasome system. A key player in this system is ubiquitin, a small protein with unique ability to form various chains. Cellular proteins marked for degradation via ubiquitin, are recruited to the proteasome either by a direct interaction with one of the intrinsic proteasomal receptors, or by adaptor proteins. These proteins typically possess ubiquitin-like domain and ubiquitin associated domain that predispose them for delivering ubiquinated proteins to the proteasome. Adaptor protein called Ddi2 differs from other members of this family by possessing additional domain called the retroviral protease like domain. This domain is structurally similar to HIV protease and its proteolytic function has been discovered only recently. Due to the presence of this proteolytic domain one could expect that Ddi2 might be a deubiquitinase. Here we therefore tested the possible cleavage of diubiquitin chains by recombinantly prepared Ddi2 protein. We can conclude that Ddi2 did not show any deubiquitinating activity in given conditions.
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9 Kurfürst, Jiří
9 Kurfűrst, Jiří
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