MAK16 is a nucleolar protein essential for eukaryotic ribosome biogenesis, specifically functioning in the maturation of the large (60S) ribosomal subunit. MAK16 contains a redox-active [4Fe-4S] iron-sulfur cluster that is critical for its function 1. The protein operates as part of the WDR74 module, a pre-ribosomal subcomplex that coordinates early pre-rRNA cleavage and late 5.8S rRNA maturation through interactions with RPF1, RRP1, and the MTR4-exosome complex 2. MAK16 participates in polypeptide exit tunnel maturation and proper 27S rRNA processing, with its abnormal retention on pre-60S complexes disrupting downstream ribosomal assembly steps 3. The protein also regulates alternative splicing events associated with RNA processing during embryonic development 4. Clinically, MAK16 dysregulation has been implicated in systemic lupus erythematosus (SLE), where anti-MAK16 autoantibodies serve as a diagnostic biomarker associated with disease activity and rash manifestations 5. Additionally, MAK16 polymorphisms show significant association with adaptation to chr8 arsenic exposure and bladder cancer susceptibility in populations with elevated As exposure 6. The vulnerability of MAK16's iron-sulfur cluster to oxidative stress suggests it functions as a cellular redox sensor, potentially regulating ribosomal assembly under stress conditions 1.