Auxin plant hormones regulate a number of different processes involved in the growth and development of plants. In response to auxin are rapid changes occurring at the level of the cell membrane and changes in gene expression . Understanding the molecular principles of operation of auxin is essential to identify the hormone receptor . The variety of physiological processes regulated by auxin indicates the possibility of the operation of several independent mechanisms of auxin perception .

This article provides basic information on proteolysis involving the ubiquitin / proteasome 26S, tightly regulated process essential for the proper functioning of cells. The focus is on discussing the proteins containing the RING finger domain and function as E3 ubiquitin ligases involved in the ubiquitination of proteins destined for degradation in the proteasome. Highlighted the RING finger domain in action oligo (SCF, Parkin, VCB, APC / C) and monomer (c-Cbl, MDM2, BRCA1, CHFR, IAP) ubiquitin ligases.