Associate Professor Department of Biology

Associate Prof. Rao obtained his B.Sc. (2001-2005) and Ph.D. (2007-2011) from National University of Singapore and Nanyang Technological University, respectively. His postdoctoral training was conducted with Dr. Solomon Snyder at Johns Hopkins University School of Medicine from 2010-2015. After an assistant investigator appointment at the National Institute of Biological Sciences, Beijing, he joined SUSTech as an associate professor and principal investigator in July 2016.

At SUSTech, Dr. Rao’s research group studies the signaling principles of emerging messenger molecules and their metabolic enzymes, with an emphasis on how they are integrated into cellular (patho)physiology via signal transduction pathways under disease micro-environment. In recent years, Dr. Rao has discovered inositol hexakisphosphate (IP6) as an intermolecular “glue” bridging the Cullin Ring E3 Ligases and its inhibitor: the deneddylase COP9 Signalosome. The applicant has also delineated how IP6 Kinases (IP6K), via converting IP6 to IP7, play important roles in cell death, cancer metastasis and DNA damage repair; These work have been published in top-tier journals and have attracted widespread attention from the scientific community, garnering more than 1400 citations in SCI journals.

Personal Profile

Associate Prof. Rao obtained his B.Sc. (2001-2005) and Ph.D. (2007-2011) from National University of Singapore and Nanyang Technological University, respectively. His postdoctoral training was conducted with Dr. Solomon Snyder at Johns Hopkins University School of Medicine from 2010-2015. After an assistant investigator appointment at the National Institute of Biological Sciences, Beijing, he joined SUSTech as an associate professor and principal investigator in July 2016.

At SUSTech, Dr. Rao’s research group studies the signaling principles of emerging messenger molecules and their metabolic enzymes, with an emphasis on how they are integrated into cellular (patho)physiology via signal transduction pathways under disease micro-environment. In recent years, Dr. Rao has discovered inositol hexakisphosphate (IP6) as an intermolecular glue bridging the Cullin Ring E3 Ligases and its inhibitor: the deneddylase COP9 Signalosome. The applicant has also delineated how IP6 Kinases (IP6K), via converting IP6 to IP7, play important roles in cell death, cancer metastasis and DNA damage repair; These work have been published in top-tier journals and have attracted widespread attention from the scientific community, garnering more than 1400 citations in SCI journals.

Research Achievements:

  1. Lin H. #, Zhang XZ. #, Liu L., Fu QY. , Zang CL. , Ding Y., Xu ZX. , He SN., Yang XL., Wei XY., Mao HB. , Cui YS , Wei Yi., Zhou CZ. , Du LL. ,Huang N. , Zheng N. , Wang T., and Rao, F.*. Molecular basis of metabolite-dependent Cullin RING ligase deneddylation by the COP9 Siganalosome. Proc Natl Acad Sci USA. 2019 (Revision)
  2. Zhang XZ, Rao F*. Inositol polyphosphates as the missing link in dynamic Cullin RING ligase regulation by the COP9 Signalosome. Biomolecules. 2019, 9, 349.
  3. C Fu, R Tyagi, AC Chin,.Fu C, Tyagi R, Chin AC, Rojas T, Li RJ, Guha P, Bernstein IA, Rao F, Xu R, Cha JY, Xu J, Snowman AM, Semenza GL, Snyder SH.Inositol Polyphosphate Multikinase Inhibits Angiogenesis via Inositol Pentakisphosphate-Induced HIF-1α [J]. Circulation Research.2018 Feb 2, 122(3):457-472.
  4. Scherer PC, Zaccor NW, Neumann NM,Vasavda C,Barrow R, Ewald AJ, Rao F, Sumner CJ, Snyder SH. TRPV1 is a physiological regulator of μ-opioid receptors[J]. Proc Natl Acad Sci USA. 2017 Dec 19, 114(51):13561-13566.
  5. Scherer,#, Ding, Y.#, Liu Z., Xu J., Mao H., Barrow JC., Wei N., Zheng N., Snyder, SH*,Rao, F.*. Inositol hexakisphosphate(IP6) generated by IP5K mediates cullin-COP9 signalosome interactions and CRL function. Proc Natl Acad Sci USA2016, 113, 3503-8.
  6. Rao F.#Xu, J.#, Fu, C., Cha JY., Xu, R., Gadalla, MM., Wu, M., Fiedler, D., Barrow, JC., Snyder, SH*. Inositol pyrophosphates promote cancer growth and metastasis by antagonizing the tumor suppressor LKB1. Proc Natl Acad Sci USA.  2015 112, 1773-8. 
  7. Rao F.#Xu, J.#, Kahn, AB., Cha, J., Xu, R. Tyagi, R., Dang, Y., Chakraborty, A., Snyder, SH*. Inositol hexakisphosphate kinase-1 mediates assembly/ disassembly of the CRL4-Signalosome complex to regulate DNA repair and cell death. Proc Natl Acad Sci USA.  2014 111, 16005-16010.
  8. Rao F., Cha, J., Xu, J., Xu, R., Vandiver, MS., Tokhunt, RT., Wu, M., Fiedler, D., Barrow, J., Snyder, SH*. Inositol pyrophosphates mediate the DNA-PK/ATM-p53 cell death pathway by regulating CK2 phosphorylation of Tti1/Tel2.  Mol Cell. 2014 54, 119-32.
  9. Tan E#., Rao F#., Pasunooti S., Pham TH., Soehano I., Turner MS., Liew CW., Lescar J., Pervushin K., Liang Z-X*.  Solution structure of the PAS domain of a thermophilic YybT homolog reveals a potential ligand-binding site. J Biol Chem.2013, 288:11949-59.
  10. Xu, R., Sen, N., Paul, BD., Rao, F., Vandiver, MS., Snyder, SH. Inositol phosphate multikinase catalyzes the acetylation of p53 by p300, thereby functioning as a p53 transcriptional co-activator.  Science Signaling. 2013, 6, ra22: 1-10.
  11. Vandiver, MS., Paul, BD., Xu, R., Karuppagounder, S., Rao, F., Snowman, AM.,  Ko, HS., Li, YI., Sen, N., Dawson, VL., Dawson, TM., Snyder, SH*. Sulfhydration mediates neuroprotective actions of Parkin. Nat Commun. 2013, 4:1626.
  12. Xu R, Paul BD, Smith DR, Tyagi R, Rao F.,Khan AB., Blech DJ., Vandiver MS., Harraz MM., Guha P., Ahmed I., Sen N., Gallagher M., Snyder SH. Inositol polyphosphate multikinase is a transcriptional coactivator required for immediate early gene induction.  Proc Natl Acad Sci USA.  2013, 6, 110, 16181-.
  13. Cha, J., Xu, J., Paul, BD., Rao, F., Ho, G., Snyder, SH. Dexras1 Mediates adipogenesis and diet-induced obesity.  Proc Natl Acad Sci USA. 2013, 110, 20575-.
  14. Chia WS., Chia, XD., Rao, F.,Bar-Nun, S., Geifman, S. ATP  binding to p97/VCP regulates selective recruitment of adaptors to its proximal N-domain. PLOS ONE, 2012, 7: e50490.
  15. Chen M.W., Kotaka M.,, Vonrhein C., Bricogne G., Rao F., Chuah, M.L., Svergun, D., Schneider, G., Liang, Z-X., and Lescar, J. Structural insights into the regulatory mechanism of the response regulator RocR from Pseudomonas aeruginosa in cyclic di-GMP signaling. J Bacteriol. 2012, 194:4837-4846.
  16. Rao, F., Wang T., Li M., Li ., Hong N., Zhao H., Yan Y., Lu W., Chen T., Wang W., Lim M., Yuan Y., Liu L., Zeng L., Wei Q., Guan G., Li C.,Hong, Y.*. Medaka tertproduces multiple variants with differential expression during differentiation in vitro and in vivo Biol .Sci2011, 7(4):426-439.
  17. Rao, F.,Ji, Q., Soehano, I., Liang, Z-X*. Unusual Heme-Binding PAS Domain from YybT Family Proteins. J Bacteriol. 2011, 193:1543-1551.
  18. Murugan, E., Kong, R., Sun, H., Rao, F.,Liang, Z-X. Expression, purification and characterization of acyl carrier protein phosphodiesterase from Pseudomonas aeruginosaProtein Expres. Purif.2010, 71:132-138.
  19. Rao, F.,See, RY., Zhang, D., Toh, DC., Liang Z-X*. YybT is a signaling protein that contains a cyclic-di-nucleotide phosphodiesterase domain and a GGDEF domain with ATPase activity. J Biol Chem. 2010, 285:473-82.
  20. Rao, F.*,Qi, Y., Murugan, E., Pasunooti, S., Ji, Q. 2’,3’-cAMP hydrolysis by metal-dependent phosphodiesterases containing DHH, EAL, and HD domains is non-specific: implications for PDE screening.  Res. Commun.2010, 398:500-505.
  21. Rao, F.,Pasunooti, S., Ng, Y., Zhuo, W., Lim, L., Liu, AW., Liang Z-X*. Enzymatic synthesis of c-di-GMP using a thermophilic diguanylate cyclase. Anal Biochem. 2009, 389:138-42.
  22. Rao, F.,Qi, Y., Chong, HS., Kotaka, M., Li, B., Lescar, J., Tang, K., Liang, Z-X*. The functional role of a conserved loop in EAL domain-based c-di-GMP specific phosphodiesterase. J Bacteriol. 2009, 191:4722-31.
  23. Qi, Y., Rao, F.,Luo, Z., Liang, Z- A flavin cofactor-binding PAS domain regulates C-di-GMP synthesis in AxDGC2 from Acetobacter xylinumBiochemistry. 2009, 48:10275-85.
  24. Kotaka, M., Dutta, S., Lee, H.C., Lim, M., Wong, Y., Rao, F.,Mitchell, E.P., Liang, Z-X, Lescar, J. Expression, purification and preliminary crystallographic analysis of Pseudomonas aeruginosaRocR protein. Acta Crystallogr. F. 2009, 65: 1035-1038.
  25. Rao, F.,Yang, Y., Qi, Y., Liang, Z-X*. Catalytic mechanism of C-di-GMP specific phosphodiesterase: a study of the EAL domain containing protein RocR from Psudomonas aeruginosa.J Bacteriol. 2008, 190:3622-31.

 (*= Corresponding Author  ; #=Co-first Author  )

Research

1. Signaling Principles of the Inositol Pyrophosphate IP7. The main interest of our group is to elucidate the function and mechanism of small molecules that are emerging messengers. The GPCR IP3 is step-wise phosphorylated generating higher inositol polyphosphates (IP4-8) whose physiology remains poorly understood. In particular, inositol pyrophosphates (IP7/8) containing energetic pyrophosphate bond(s) are enigmatic inositol derivatives dynamically generated from inositol hexakisphosphate (IP6) by IP6 kinases (IP6Ks) and IP7 kinases (IP7Ks). We have previously uncovered IP7 as a critical determinant of cancer cell fate (apoptosis vs metastasis). By studying the regulation of IP6Ks and enzymes leading to IP6 production in cell- and animal-based models, we aim to uncover the (patho)physiology (e.g. cell migration and cancer metastasis) and signal transduction pathways mediated by inositol pyrophosphate metabolites, especially in the context of disease microenviroments. On top of this, we employ chemical and biochemical approaches to identify effector modules and their mode of interactions, with the goal to unravel underlying principles of inositol pyrophosphate signaling. Given the key roles of IP6K/IP7 in tumor progression and other metabolic diseases, the mechanistic and functional insights gained from this investigation will hopefully provide new therapeutic targets.

2. Cullin Ring E3 ligases(CRLs) are a major family of protein ubiquitination

machineries that are aberrantly active in cancer and mediate the degradation of many proteins involved in carcinogenic process such as cell survival, growth, metabolism, autophagy, migration and immune evasion. Neddylation activates CRL. The COP9 signalosome (CSN) binds, deneddylates, and inactivates CRL. Our group recently discovered a role for the inositol polyphosphate metabolites in assembling and disassembling CRL-CSN complexes. How such metabolite-dependent CRL regulation integrates into cellular physiology, especially in context of nutrient sensing, is the emphasis of our future studies.


Teaching

Molecular Pharmacology,Biochemistry II (Metabolism),Frontier in Life Sciences Seminar


Publications Read More

Research Achievements

(1)Uncovered IP7 and its synthase IP6K2 as critical determinants of cancer cell fate (apoptosis vs metastasis).(Rao et al. Mol Cell, 2014, Rao et al. PNAS 2015)。

(2)Idnetified IP6 as a CRL-CSN intermolecular “glue” , whose depletion synergizes with the neddylation inhibitor Pevonedistat, a phase III clinical trial drug, in inhibiting CRL E3 ligase(Rao et al. PNAS, 2014; Scherer,…,Rao*. PNAS, 2016; Lin,…, Rao*. 2019 PNAS revision)

(3)First to identify the YybT family phosphodiesterases that specifically hydrolyzes the 2nd messenger c-di-AMP(Rao et al.JBC 2010, Rao et al. J. Bacteriol. 2011, Tan#, Rao# et al. JBC 2013)。

(4)Invented a method for large-scale production of the 2nd messenger c-di-GMP by enzymatic synthesis(Patent:US8,859,237 B2; Rao et al. Anal. Biochem. 2009); Elucidated the catalytic and regulatory mechanisms of c-di-GMP specific phosphodiesterases (Rao et al. J. Bacteriol. 2008, Rao et al. J. Bacteriol. 2009;)。

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Join us

We have one position open for postdoc and one for doctoral student . If you are interested, please contact us:

raof@sustech.edu.cn

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Contact Us

Contact Address

Room 324, Building B, Southern University of Science and Technology, No. 1088 Xueyuan Rd., Nanshan District, Shenzhen, Guangdong, China, 518055

Office Phone

88018439

Email

raof@sustech.edu.cn

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