Words similar to ubiquitylation

Example sentences for: ubiquitylation

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The protein product of the mdm2 oncogene is over-expressed in a considerable number of tumors [ 27 ] . This protein is a pivotal negative regulator of p53 [ 27 ] ; it interacts with the P53 protein masking its transcriptional domain and accelerating its proteasomal degradation [ 21 27 ] . The later process involves the deacetylation and ubiquitylation of the p53 protein by mdm2 [ 28 ] . Inactivation and/or degradation of p53 diminishes the cell ability to undergo apoptosis [ 21 ] . Conversely, p53 may influence mdm2.
Two rate-limiting steps for p27 ubiquitylation were defined: (1.)
Biochemical studies identified SCF SKP2, an E3 that mediates p27 ubiquitylation in vitro [ 20 21 ] . This complex consists of at least four proteins: SKP1, CUL1, HRT1 (=RBX1/ROC1), and SKP2.
E3 enzymes are of particular interest, as they mediate the substrate specificity of ubiquitylation reactions.
In addition, based on overexpression, distinct SCF Pop1pand SCF Pop2pcomplexes were proposed to target unknown substrates, but no biochemical evidence of their activity was provided [ 18 ] . To address these questions, we cloned two additional subunits of SCF Popand performed a detailed characterization of its activity in vitro and in vivo . Our results indicate that heterooligomeric SCF Pop1p-Pop2pmediates Rum1p ubiquitylation whereas distinct SCF Pop1pand SCF Pop2pcomplexes target unknown nuclear and cytoplasmic substrates, thereby generating combinatorial diversity of SCF function in fission yeast.