UQCRB (ubiquinol-cytochrome c reductase binding protein) is a critical component of mitochondrial respiratory complex III that facilitates electron transport and oxidative phosphorylation 1. The protein plays essential roles in mitochondrial respiration and energy metabolism, with its expression levels significantly impacting cellular bioenergetics 2. UQCRB's mechanism involves stabilizing complex III structure and enabling efficient electron transfer from ubiquinol to cytochrome c within the mitochondrial electron transport chain 3. Disease relevance is substantial, as UQCRB overexpression correlates with colorectal cancer progression and serves as a prognostic biomarker 45. Copy number variations and increased expression levels are associated with advanced cancer stages and poor prognosis 4. Additionally, UQCRB functions as a host regulator of Ebola virus replication, with small-molecule inhibition reducing viral infection 1. Clinical significance extends to immunotherapy response prediction in non-small cell lung cancer, where UQCRB is part of a 5-gene signature that accurately stratifies patients for immune checkpoint inhibitor treatment outcomes 6. The protein's dysregulation affects metabolic pathways including cholesterol biosynthesis and is associated with various microRNA networks that influence cellular proliferation and oncogenic processes 75.