The function of RNF6 (ring finger protein 6, ENSG00000127870) is as follows. E3 ubiquitin-protein ligase mediating 'Lys-48'-linked polyubiquitination of LIMK1 and its subsequent targeting to the proteasome for degradation (By similarity). Negatively regulates axonal outgrowth through regulation of the LIMK1 turnover (By similarity). Mediates 'Lys-6' and 'Lys-27'-linked polyubiquitination of AR/androgen receptor thereby modulating its transcriptional activity (PubMed:19345326). May also bind DNA and function as a transcriptional regulator (By similarity). Mediates polyubiquitination of QKI in macrophages, leading to its degradation (By similarity). .