Ring finger ubiquitin protein ligases and their implication to the pathogenesis of human diseases

Current Pharmaceutical Design
Helen C Ardley

Abstract

The ubiquitin proteasome system (UPS) plays a fundamental role in maintaining the correct balance of protein levels inside all living cells. Degradation of proteins by this pathway is essential for most cellular processes including cell signalling, DNA repair, apoptosis and gene transcription. Any disruption to the system is likely to have severe consequences which may lead to disorders including neurodegeneration and cancer. Ubiquitin protein ligases are a group of UPS proteins of particular importance because these proteins determine targeting specificity via recognition of a 'target' protein and its' subsequent 'tagging' with ubiquitin. The 26S proteasome recognises these mutli-ubiquitylated proteins, allowing the correct protein to be degraded at the correct time and place within each cell. Several types of ubiquitin protein ligase have now been identified, however, the largest group by far are those proteins containing a 'RING' motif. In this review, examples will be given whereby abnormal protein ubiquitylation due to absence or inefficiency of a RING protein ligase is proposed to be a key regulator of the disease process. Ways in which we may be able to reverse these effects or manipulate these proteins to restore functi...Continue Reading

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