hi, can someone help me with this question? thanks!
"In a typical fairy shrimp cell there are only 10 proteins that show up in a western blot using an anti-ubiquitin antibody. you over-express an endopeptidase in fairy shrimp cells and find that 5 additional proteins are ubiquitin-tagged. you later find a mutation that suppresses this effect: in mutant cells overexpressing the endopeptidase, only the typical 10 ubiquitinated proteins are detected. how do endopeptidases regulate ubiquitination and what type of protein is likely missing in the mutant?