Introduction

Ubiquitin, as its name implies is a ubiquitous protein , it is found widely in eukaryote. This protein has 76 amino acids.
Functions
Poly Ubiquitin
This type of protein modification is associated with protein degradation.
Mono Ubiquitin
This type of protein modification is associated with variety of cells' functions. this type of modification is seen in receptor down regulation and PCNA modification.