VHL-null 786-O renal carcinoma cells were infected with lentiviral vectors expressing FLAG-tagged VHL, VHL-P81S, or an empty vector. After puromycin selection, the levels of HP1, lysine-9 tri-methylated histone H3, ubiquitinated histone H2A, ubiquitinated histone H2B, and ubiquitinated cellular proteins were examined by immunoblotting. The expression levels of FLAG-VHL and FLAG-VHL-P81S were also examined by anti-FLAG immunoblotting. Tubulin serves as a loading control.