Ubiquitin-like protein 4A (UBL4A)

Ubiquitin-like protein 4A (UBL4A) is a ubiquitin-like protein that acts as part of the cytosolic BAG6/BAT3 complex, which is essential for maintaining the solubility and proper handling of misfolded, hydrophobic, or mislocalized proteins in the cytosol[1][3][4][9]. UBL4A participates in the post-translational delivery of tail-anchored or type II transmembrane proteins to the endoplasmic reticulum; when delivery fails, these proteins are ubiquitinated and sorted for degradation by the proteasome[3][4][9]. The BAG6/BAT3 complex helps ensure quality control for secretory and membrane proteins, including endoplasmic reticulum-associated degradation (ERAD)[3][4][9]. UBL4A is widely expressed in human tissues[6], but it is not a typical drug target, nor does it serve as a receptor, enzyme, or transporter in current therapeutic paradigms. Its primary molecular function is protein folding and quality control, rather than signal transduction or cellular response as seen in classical therapeutic targets. Much of the information found in search results refers to UBL4A’s role in protein quality control and its molecular associations. There is no evidence of it being a direct drug target or biomarker, nor is it classified within canonical druggable target families (receptor, enzyme, ion channel, transporter)[1][2][3][4][9]. Its main function is as a ubiquitin-like molecular chaperone.

Other names

UBL4AUBL4DX254EDXS254EGDXGET5MDY2TMA24Ubiquitin-like protein GDXUbiquitin-like protein 4A