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Abstract:
Arsenic, an ancient drug used in traditional Chinese medicine,has attracted worldwide interest because it shows substantialanticancer activity in patients with acute promyelocytic leukemia(APL). Arsenic trioxide (As2O3) exerts its therapeutic effectby promoting degradation of an oncogenic protein that drivesthe growth of APL cells, PML-RAR (a fusion protein containingsequences from the PML zinc finger protein and retinoic acidreceptor alpha). PML and PML-RAR degradation is triggered bytheir SUMOylation, but the mechanism by which As2O3 inducesthis posttranslational modification is unclear. Here we showthat arsenic binds directly to cysteine residues in zinc fingerslocated within the RBCC domain of PML-RAR and PML. Arsenic bindinginduces PML oligomerization, which increases its interactionwith the small ubiquitin-like protein modifier (SUMO)–conjugatingenzyme UBC9, resulting in enhanced SUMOylation and degradation.The identification of PML as a direct target of As2O3 providesnew insights into the drugs mechanism of action and itsspecificity for APL.
1 State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Rui Jin Hospital affiliated to Shanghai Jiao Tong University School of Medicine, 197 Rui Jin Road II, Shanghai 200025, China. 2 State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences (CAS), Shanghai 200031, China. 3 National Synchrotron Radiation Laboratory, University of Science and Technology of China and Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, CAS, Beijing 10004, China. 4 Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China. 5 Université de Paris 7/INSERM/CNRS UMR 944/7151, Equipe Labellisée No. 11 Ligue Nationale Contre le Cancer, Hôpital St. Louis, Avenue C. Vellefaux, 75475 Paris CEDEX 10, France. 6 Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, CAS, Shanghai 201203, China. 7 Laboratory of Molecular Carcinogenesis and Targeted Therapy for Cancer, State Key Laboratory of Biomembrane and Membrane Biotechnology, and Key Laboratory of Stem Cell Development, Institute of Zoology, CAS, Beijing, China. 8 The Pôle Sino-Français de génomique et de Sciences du vivant de lHôpital Rui-Jin, 197 Rui-Jin Road II, Shanghai, China.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: zchen{at}stn.sh.cn (Z.C.); sjchen{at}stn.sh.cn (S.-J.C.)
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