TRIM27 (RFP) is an E3 ubiquitin ligase for PTEN. TRIM27 polyubiquitinates PTEN on multiple lysines in the C2 domain of PTEN using K27-linkage between ubiquitin molecules. TRIM27-mediated ubiquitination inhibits PTEN lipid phosphatase activity, but does not affect PTEN protein localization or stability (Lee et al. 2013).
ubiquitin protein ligase activity of PTEN:TRIM27 [cytosol]