摘要:
There is provided a method for producing free polyubiquitin chains linked through a single desired lysine residue, comprising the steps of: (a) selecting an E3 ubiquitin ligase enzyme which is homologous to mammalian HECT E3 ligases and possesses the desired lysine residue specificity; (b) incubating the E3 enzyme with an E1 ubiquitin activating enzyme, an E2 ubiquitin conjugating enzyme and monomeric ubiquitin; and (c) if undesired linkages are present, removing the undesired linkages by exposure to a DUB enzyme having the appropriate specificity.
摘要:
There is described a method for analyzing ubiquitin polymers using linkage-specific deubiquitinase enzymes. Novel specificities of deubiquitinase enzymes are also provided.
摘要:
There is described a substrate for measuring the activity of a deubiquitinating enzyme (DUB), comprising a diubiquitin molecule, wherein an ubiquitin monomer is labeled with a fluorescent label, as well as an assay for DUB enzymes using such substrates.
摘要:
The invention provides a chimeric E2 enzyme comprising a Ubc domain fused to a heterologous ubiquitin binding domain (UBD). The chimeric enzymes of the invention may be useful in producing elevated levels of free polyubiquitin.