| Modification Notes |
Ubiquitination is an important mechanism through which three classes of enzymes act in concert to target short-lived or abnormal proteins for destruction. The three classes of enzymes involved in ubiquitination are the ubiquitin-activating enzymes (E1s), the ubiquitin-conjugating enzymes (E2s) and the ubiquitin-protein ligases (E3s). Pam, also known as MYCBP2 (Myc-binding protein 2), is a 4,640 amino acid nuclear protein that contains one B box-type zinc finger, one DOC domain, one filamin repeat, five RCC1 repeats and one RING-type zinc finger. Expressed ubiquitously with highest expression in thymus and brain, Pam is thought to function as an E3 ubiquitin-protein ligase that may be involved in the degradation of a variety of target proteins. Additionally, Pam may also be involved in regulating c-Myc expression, possibly influencing synaptogenesis. Two isoforms of Pam exist due to alternative splicing events. |