Haem-dependent dimerization of PGRMC1/Sigma-2 receptor facilitates cancer proliferation and chemoresistanceKabe, Y., Nakane, T., Koike, I., Yamamoto, T., Sugiura, Y., Harada, E., Sugase, K., Shimamura, T., Ohmura, M., Muraoka, K., Yamamoto, A., Uchida, T., Iwata, S., Yamaguchi, Y., Krayukhina, E., Noda, M., Handa, H., Ishimori, K., Uchiyama, S., Kobayashi, T., Suematsu, M.
(2016) Nat Commun 7: 11030-11030
- PubMed: 26988023
- DOI: 10.1038/ncomms11030
- PubMed Abstract:
Progesterone-receptor membrane component 1 (PGRMC1/Sigma-2 receptor) is a haem-containing protein that interacts with epidermal growth factor receptor (EGFR) and cytochromes P450 to regulate cancer proliferation and chemoresistance; its structural ba ...
Progesterone-receptor membrane component 1 (PGRMC1/Sigma-2 receptor) is a haem-containing protein that interacts with epidermal growth factor receptor (EGFR) and cytochromes P450 to regulate cancer proliferation and chemoresistance; its structural basis remains unknown. Here crystallographic analyses of the PGRMC1 cytosolic domain at 1.95 Å resolution reveal that it forms a stable dimer through stacking interactions of two protruding haem molecules. The haem iron is five-coordinated by Tyr113, and the open surface of the haem mediates dimerization. Carbon monoxide (CO) interferes with PGRMC1 dimerization by binding to the sixth coordination site of the haem. Haem-mediated PGRMC1 dimerization is required for interactions with EGFR and cytochromes P450, cancer proliferation and chemoresistance against anti-cancer drugs; these events are attenuated by either CO or haem deprivation in cancer cells. This study demonstrates protein dimerization via haem-haem stacking, which has not been seen in eukaryotes, and provides insights into its functional significance in cancer.
JST, CREST, Kyoto 606-8501, Japan.,Okazaki Institute for Integrative Bioscience, National Institutes of Natural Sciences, Okazaki 444-8787, Japan.,Bioorganic Research Institute, Suntory Foundation for Life Sciences, Kyoto 619-0284, Japan.,Department of Statistical Genetics, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan.,Department of Biological Information, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama 226-8501, Japan.,Department of Medical Chemistry and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan.,Department of Biotechnology, Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan.,Department of Nanoparticle Translational Research, Tokyo Medical University, Tokyo 160-8402, Japan.,Department of Biochemistry, Keio University School of Medicine, and Japan Science and Technology Agency (JST), Core Research for Evolutional Science and Technology (CREST), Tokyo 160-8582, Japan.,Platform for Drug Discovery, Informatics, and Structural Life Science, JST, Kyoto 606-8501, Japan.,Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan.,Department of Biochemistry, Keio University School of Medicine, JST, Exploratory Research for Advanced Technology (ERATO), Suematsu Gas Biology Project, Tokyo 160-8582, Japan.,JST, Research Acceleration Program, Membrane Protein Crystallography Project, Kyoto 606-8501, Japan.