PEX2 Antibody

Overview of PEX2 Antibody

The PEX2 Antibody is a specialized immunological tool designed to detect and study the peroxisomal biogenesis factor 2 (PEX2), a protein critical for peroxisome assembly and function . Also known as PXMP3, PEX2 is an integral peroxisomal membrane protein involved in matrix protein import and pexophagy (selective autophagy of peroxisomes) . Antibodies targeting PEX2 enable researchers to investigate its expression, localization, and role in cellular processes and diseases.

Role in Pexophagy

PEX2 functions as an E3 ubiquitin ligase, tagging peroxisomal membrane proteins (e.g., PMP70 and PEX5) with ubiquitin to signal their degradation via autophagy . Key findings include:

• Knockdown of PEX2 prevents peroxisome loss during amino acid starvation, indicating its necessity for pexophagy .

• Overexpression of PEX2 increases ubiquitination of peroxisomal proteins, leading to peroxisome clustering and degradation via the autophagy receptor NBR1 .

• PEX2 expression is regulated by mTORC1 signaling, linking nutrient availability to peroxisome turnover .

Disease Associations

Mutations in PEX2 cause peroxisome biogenesis disorders (PBDs) such as Zellweger syndrome and infantile Refsum disease . Notable mutations and their impacts:

In Drosophila models, human PEX2 variants like C247R and R119* fail to rescue peroxisomal defects, mirroring severe human phenotypes .

Validation and Technical Considerations

• Specificity: Antibodies like ABIN1535158 are validated using peptide-blocking assays, confirming minimal cross-reactivity .

• Buffer Composition: Many formulations include sodium azide (0.02%), requiring careful handling .

• Storage: Long-term storage at -20°C preserves stability, with freeze-thaw cycles avoided .

Emerging Insights from Recent Studies

• In Vivo Models: Drosophila studies demonstrate that human PEX2 reference constructs partially restore peroxisomal function in Pex2-null mutants, while disease-associated variants (e.g., C247R) show negligible rescue .

• Therapeutic Targets: PEX2’s role in pexophagy positions it as a potential target for modulating peroxisome dynamics in metabolic disorders .