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Ubiquitin B pseudogene 4 (UBBP4)

Target: UBBP4
Molecular classification: Other (Ubiquitin variant/pseudogene producing functional protein)

Overview

Ubiquitin B pseudogene 4 encodes several ubiquitin protein variants that differ in amino acid sequence from canonical ubiquitin, most notably the variant called Ub KEKS (Q2K, K33E, Q49K, N60S)[2]. Unlike canonical ubiquitin, which marks proteins for proteasomal degradation, Ub KEKS modifies targets such as nuclear lamins, with these conjugates not being targeted for degradation[2]. Knockout of UBBP4 in human cell lines delays cell division and causes accumulation of lamin A in the nucleolus, indicating roles in cell cycle regulation and nuclear architecture[2]. Originally annotated as an unprocessed pseudogene, UBBP4 has now been shown through transcriptomic and proteomic analyses to produce functional proteins in humans[2][3][5][7]. The presence of ‘pseudogene’ in its name can be misleading, as it encodes proteins that participate in cellular processes, but there is currently no evidence that it serves as a direct therapeutic drug target.

Other names: UBBP4Ubiquitin B pseudogene 4

Biological functions

Protein modification (ubiquitylation)Regulation of nuclear lamina structure (via modification of lamins)Cell cycle progression (knockout slows cell division)Regulation of protein fate (not proteasomal degradation)

Disease associations

Other (potential role in laminopathies, indirect links to disease via regulation of lamins)

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