| UBE3A Protein (E6-AP) | |
|---|---|
| Protein Name | Ubiquitin-Protein Ligase E3A (E6-AP) |
| Gene | UBE3A |
| UniProt | Q05067 |
| Molecular Weight | 100 kDa |
| Subcellular Localization | Cytoplasm, Nucleus |
| Protein Family | HECT domain E3 ubiquitin ligases |
| PDB Structures | 1C4Z, 1D5F |
Ube3A Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
UBE3A (also known as E6-AP, encoded by the UBE3A gene) is a HECT (Homologous to E6-AP C-terminus) domain E3 ubiquitin ligase. The protein was originally identified as forming a complex with the viral E6 protein from human papillomavirus (HPV) that targets p53 for degradation [1]. In the absence of viral E6, UBE3A performs essential functions in neuronal protein homeostasis.
UBE3A is expressed in all tissues but has crucial roles in the brain due to genomic imprinting—neurons specifically express only the maternally-inherited allele, making them uniquely vulnerable to mutations.
UBE3A contains several key domains:
The HECT domain adopts a bilobal structure with an E2-binding site and a catalytic lobe.
UBE3A catalyzes ubiquitination through:
UBE3A ubiquitinates several important neuronal proteins:
In neurons, UBE3A regulates:
Loss of maternal UBE3A expression causes Angelman syndrome. This is due to:
UBE3A duplications or increased expression are linked to autism. The protein sits at the intersection of synaptic function and social behavior.
Altered UBE3A function may contribute to:
The study of Ube3A Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.