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College of Pharmacy Faculty
Department of Phamacological and Pharmceutical Sciences

Ke-He Ruan, M.D., Ph.D.
Professor of Medicinal Chemistry & Pharmacology

Patents and Selected Publications

A. Patents

  • Compositions and Methods of Use for a Protein that Converts Arachidonic Acid into Prostacyclin, 2006.
  • Provisional patent : Engineering of a Single Protein with Triple Catalytic Enzyme Activities Directly Converted Arachidonic Acid into Prostaglandin E2, 2006.

B. Publications
1. Ruan, K.-H., Imagawa, M., Hashida, S., and Ishikawa, E.: An improved method for the conjugation of Fab' to ?-D-galactosidase from Escherichia coli. Anal. Lett. 17:539-554, 1984.
2. Ruan, K.-H., Hashida, S., and Ishikawa, E.: A micro-scale preparation of affinity-purified Fab'-enzyme conjugates with high purity for enzyme immunoassay. Anal. Lett. 17(B 1 8):2075-2090, 1984.
3. Hashida, S., Imagawa, M., Inoue, S., Ruan, K.-H., and Ishikawa, E.: More useful maleimide compounds for the conjugation of Fab'-to horseradish peroxidase through thiol groups in the hinge. J. Appl. Biochem. 6:56-63, 1984.
4. Inoue, S., Imagawa, M., Hashida, S., Ruan K-H, and Ishikawa, E.: A small scale preparation of affinity-purified rabbit Fab’-horseradish conjugate for enzyme immunoassay. Anal. Lett. 17 (B3):229-242,1984.
5. Ruan, K.-H., Hashida, S., and Yoshitake, S., Ishikawa, E., Walkisaka, O., Yamamoto, Y., Ichioka, T., and Nakajima, K.: A micro-scale affinity-purification of Fab'-horseradish peroxidase conjugates and its use for sandwich enzyme immunoassay of insulin in human serum. Clin. Chim. Acta 147:167-172, 1985.
6. Hashida, S., Ruan, K.-H., and Ishikawa, E.: A micro-scale affinity purification of Fab'enzyme conjugates: VTV International Conference on Labeled Antibodies (Tokyo) November, 1985.
7. Ruan, K.-H., Hashida, S., Yoshitake, S., Ishikawa, E., Wakisaka, O., Yamamoto, Y., Ichioka, T., and Nakajima, K.: A more sensitive and less time-consuming sandwich enzyme immunoassay for insulin in human serum with less serum interference. Ann. Clin. Biochem. 23:54-58, 1986.
8. Kohno, T., Ruan, K.-H., and Ishikawa, E.: A highly sensitive enzyme immunoassay of anti-insulin antibodies in guinea pig serum. Anal. Lett. 19. 1083-1095, 1986.
9. Ruan, K.-H., Hashida, S., Tanaka, K., and Ishikawa, E.: A small-scale sandwich enzyme immunoassay for macromolecular antigens using beta-D-galactosidase from Escherichia coli and horseradish peroxidase as labels. Anal. Lett. 20 (4):587-601, 1987.
10. Ishikawa, E., Hashida, S., Kohono, T., Tanaka, K., Ruan, K.-H., and Ishoue, S.: Enzyme labeling of antibodies and enzyme immunoassay. in: Cellular, Molecular and Genetic Approaches to Immunodiagnosis and Immunotherapy. (Kano, K., Mori, S., Sugisaki, T., and Rorisu, M., eds). Pp.116-128, 1987.
11. Ruan, K.-H., Ke, D.-R., Hang, S.-W., Ni, D.-R., Pan S.-Z., Yao, R.-H, Lin, H.-X., and Xie, Z.-C.: Determination of insulin in human saliva using a more sensitive sandwich enzyme immunoassay. Anal. Lett. 21:381-394,1988.
12. Ruan, K.-H. and Ke, D.-R..: Small-scale sandwich enzyme immunoassay for human chorionic gonadotropin using a new micro-transferable plastic bead. Ann. Clin. Biochem. 25:645-649, 1988.
13. Atassi, M. Zhouhair, Ruan, K.-H., Spurlino, J., and Quiocho, F.: Determination of the region to-region contacts and the disposition of ?-bungarotoxin within the toxin-binding site on human acetylcholine receptor. J. Prot. Chem. 9:349-3509, 1990.
14. Ruan, K.-H., Spurlino, J., Quiocho, F.A., and Atassi, M.Z.: Acetylcholine receptor-bungarotoxin interactions: Determination of the region-to-region contacts by peptide-peptide interactions and molecular modeling. Proc. Natl. Acad. Sci. 87:6156-6160, 1990.
15. Ruan, K.-H. and Atassi, M.Z.: Full profile of the short neurotoxin-binding regions on the extracellular part of the a-chain of the acetylcholine receptor. Biochem. J. 274:849-854, 1991.
16. Ashizawa, T., Ruan, K.-H., Jinnai, K., and Atassi, M.Z.: Profile of the regions on alpha-chain of human acetylcholine receptor recognized by autoantibodies in Myasthenia Gravis. Mol. Immunol. 29:1507-1514,1992.
17. Atassi, M.Z., Ruan, K.-H., Jinnai, K., Oshima, M., and Ashizawa, T.: Epitope-specific suppression of antibody response in experimental autoimmune myasthenia gravis by a monoethoxypolyethylene glycol conjugate of a myasthenogenic synthetic peptide. Proc. Natl. Acad. Sci. USA 89:5852-5856, 1992.
18. Ohashi, K., Ruan, K.-H., Kulmacz, R.J., Wu, K.K. and Wang, L.-H.: Primary structure of human thromboxane synthase determined from the cDNA sequence. J. Biol. Chem. 267, 789-793, 1992.
19. Yio, Y.-Y., Jian, J., Yin, F.-Z., and Ruan, K.-H.: highly sensitive sandwich enzyme immunoassay for alpha-fetoprotein in human saliva. Ann. Clin. Biochem. 29, 519-522, 1992.
20. Ruan, K.-H., Wang, L.-H., Wu, K.K., and Kulmacz, R.J.: NH2-terminal topology of thromboxane synthase in the endoplasmic reticulum. J. Biol. Chem. 268:19483-19490, 1993.
21. Ruan, K.-H., Kulmacz, R.J., Wilson, A., and Wu, K.K.: Highly sensitive fluorimetric enzyme immunoassay for prostaglandin H synthase solubilized from cultured cells. J. Immunol. Methods. 162:23-30, 1993.
22. Xu, X.-M., Ohashi, K., Sanduja, S.K., Ruan, K.-H., Wang, L.-H., and Wu, K.K.: Enhanced prostacyclin synthesis in endothelial cells by retrovirus-mediated transfer of prostaglandin H synthase cDNA. J. Clin. Invest. 91:1843-1849, 1993.
23. Ruan, K.-H., Milfeld, K., Kulmacz, R.J., and Wu, K.K.: Construction of a three-dimensional model of human thromboxane synthase: implication for substrate-binding pocket. Protein Engin. 7:1345-1351, 1994.
24. Ruan, K.-H., Ping, L., Kulmacz, R.J., and Wu, K.K.: Characterization of the structure and membrane interaction of NH2-terminal domain of thromboxane A2 synthase. J. Biol. Chem. 269:20938-20942, 1994.
25. Ren, Y., Walker, C., Loose-Mitchell, D.S., Deng, J., Ruan, K.-H., and Kulmacz, R.J.: Topology of prostaglandin H synthase-1 in the endoplasmic reticulum membrane. Arch. Biochem. Biophys. 323, 205-214, 1995.
26. Guo, Q., Wang, L.-H., Ruan, K.-H., and Kulmacz, R.J.: Role of Val509 in time-dependent inhibition of human prostaglandin H synthase-2 cyclooxygenase activity by isoform-selective agents. J Biol. Chem. 271. 19134-19139, 1996.
27. Wang, L.-H., Matijevic-Aleksic, N., Hsu, P.-Y., Ruan, K.-H., Wu, K.K. and Kulmacz, R.J.: Identification of thromboxane A2 synthase active site residues by molecular modeling-guided site-directed mutagenesis. J. Biol. Chem. 271, 19970-19975, 1996.
28. Shyue, S., Ruan, K.-H., Wang, L.-H., and Wu, K.K.: Prostacyclin synthase active sites: Identification by molecular modeling-guided site-directed mutagenesis. J. Biol. Chem. 272, 3657-3662, 1997.
29. Ruan, K.-H., Li, D., Ji, J., Lin, Y. -Z., and Gao, X.: Structural characterization and topology of the second potential membrane anchor region in the thromboxane A2 synthase amino terminal domain. Biochemistry, 37, 822-830, 1998.
30. Lin, Y.-Z., Wu, K.K. and Ruan, K.-H.: Characterization of secondary structure and membrane interaction of the putative membrane anchor domains of prostaglandin I2 synthase and cytochrome P450 2C1. Arch. Biochem. Biophys. 352, 78-84, 1998.
31. Lin, Y-Z., Deng, H. and Ruan, K.-H.: Topology of catalytic portion of prostaglandin I2 synthase: Identification by molecular modeling-guided site-specific antibodies. Arch. Biochem. and Biophys. 379, 188-197, 2000.
32. So, S-P., Li, D. and Ruan, K.-H.: Identification of the substrate-interaction site in the N-terminal membrane anchor segment of thromboxane A2 synthase by determination of its substrate analog conformation changes using high resolution NMR technique. J. Biol. Chem. 275, 40679-40685, 2000.
33. Ruan, K.-H., So, S-P, Wu, J., Huang, A. and Kung J. Solution structure of second extracellular loop of human thromboxane A2 receptor. Biochemistry, 40, 275-280, 2001.
34. Deng, W.G., Ruan, K.-H, Du, M., Sauders, M., and Wu, K.K. Aspirin and salicylate bind to immunoglobulin heavy-chain binding protein (BiP) and inhibit its ATPase activity in human fibroblasts. FASEB J. 15, Nov. 2001.
35. Arbab, F., Goldsby, J. S., Matijevic-Aleksic, N., Huang, G., Ruan, K.-H., and Huang, J-C. Prostacyclin is an autocrine regulator in the contraction of oviductal smooth muscle, Hum Reprod. 17, 3053-3059, 2002.
36. Deng, H., Huang A., So, S.-P., Lin, Y.-Z. and Ruan, K.-H. Substrate access channel topology in membrane-bound prostacyclin synthase. Biochem. J., 362, 545-551, 2002.
37. Ruan, K.-H, So, S.-P., Zheng, W., Wu, J., Li, D, Kung, J., Li, D., Kung, J. Solution Structure and topology of the NH2-Terminal membrane anchor domain of a microsomal P450: Prostaglandin I2 Synthase. Biochem. J. 368, 721-728, 2002.
38. So, S.-P., Wu, J., Huang, G., Huang, A., Li, D., Ruan, K.-H. Identification of Residues Important for Ligand Binding of Thromboxane A2 Receptor in the Second Extracellular Loop Using the NMR Experiment-guided Mutagenesis Approach. J. Biol. Chem. 278, 10922-10927, 2003.
39. Wu, J., So, S.-P., Ruan, K.-H. Determination of the membrane contact residues and solution structure of the helix F/G loop of prostaglandin I2 synthase. Arch. Biochem. Biophys. 411, 27-35, 2003.
40. Deng, H., Wu, J., So, S.-P., Ruan, K.-H. Identification of the residues in the helix F/G loop important to catalytic function of membrane-bound prostacyclin synthase. Biochemistry, 42, 5609-5617, 2003.
41. Wu, J., So, S.-P., and Ruan, K.-H. Solution structure of the third extracellular loop of human thromboxane A2 receptor. Arch. Biochem. Biophys. 414, 287-293, 2003.
42. Ruan, K.-H., Wu, J., So, S.-P., and Jenkins, L. A. Evidence of the residues involved in ligand recognition in the second extracellular loop of the prostacyclin receptor characterized by high resolution 2D NMR techniques. Arch. Biochem. Biophys. 418, 25-33, 2003.
43. Geng, L., Wu, J., So, S.-P., and Ruan, K.-H. Structural and functional characterization of the first intracellular loop of thromboxane A2 receptor. Arch. Biochem. Biophys, 423, 253-265, 2004.
44. Dogne JM, de Leval X, Hanson J, Frederich M, Lambermont B, Ghuysen A, Casini A, Masereel B, Ruan KH, Pirotte B, Kolh P. New developments on thromboxane and prostacyclin modulators part I: thromboxane modulators. Curr Med Chem. 11, 1223-1241, 2004.
45. Ruan, K.-H. Advances in biosynthesis of thromboxane A2 and prostacyclin in endoplasmic reticulum membrane via cyclooxygenase pathway. Mini Rev. Med. Chem., 4, 639-647, 2004.
46. Ruan, K.-H. High resolution NMR spectroscopy-guided mutagenesis for characterization of membrane-bound proteins: experimental designs and applications. Spectroscopy, 18, 13-29, 2004.
47. Ruan, K.H., Wu, J., So, S., Jenkins, L. and Ruan, CH. NMR structure of the thromboxane A2 receptor ligand recognition pocket. Eur. J. Biochem. 271, 1–11, 2004.
48. Ruan, K.-H, Deng, H, Wu, J., So, SP. The N-terminal membrane anchor domain of the membrane-bound prostacyclin synthase involved in the substrate presentation of the coupling reaction with cyclooxygenase. Arch. Biochem. Biophys, 435, 372-381, 2005.
49. Ruan, K.-H. Thrombogenesis and anti-thrombogenesis in atherosclerosis mediated by prostanoids through the cyclooxygenase pathway. Chapter V, in: current Topics in Atherosclerosis Research. Editor Y.J. Geng, Nova Science Publishers Inc. New York, 2005.
50. Ruan, K.-H., Wu, J, Wang LH. Solution structure of a common substrate mimetic of cyclooxygenase-downstream synthases bound to an engineered thromboxane A2 synthase using a high-resolution NMR technique. Arch Biochem Biophys 444, 165-173, 2005.
51. Ruan, CH, Wu, J., Ruan K-H. A strategy using NMR peptide structures of thrombxane A2 recetor as templates to construct ligand-recognition pocket of prostacyclin receptor. BMC Biochem. 6:23, 2005.
52. Zhang, L., Huang, G., Wu, J Ruan K-H. A profile of the residues in the first intracellular loop critical for Gs-mediated signalling of human prostacyclin receptor characterized by an integrative approach of MR-experiment and mutagenesis. Biochemistry 44:11389-11401, 2005.
53. Dogné, J., Hanson, J., Leval, X., Pratico, D., Pace-Asciak, C., Pirotte, B and Ruan, K.-H. From the design to the clinical application of thromboxane modulators. Curr Pharm Design, 12, 903-923, 2006.
54. Ruan, K.-H. and Dogné, J. Implications of the molecular basis of prostacyclin biosynthesis and signaling in pharmaceutical designs. Curr Pharm Design, 12, 925-941, 2006.
55. Huang, JC, Ruan, CH, Tang, K and Ruan, KH. Prunella stica inhibits the proliferation but not the prostaglandin production of Ishikawa cells. Life Sci. 79, 436-441, 2006.
56. Dogne JM, Ruan KH. Latest developments in pharmaceutical design of arachidonic acid metabolites: prostaglandsin, thromboxanes, hepoxillins and isoprostanes. Curr Pharm Des. 12, 893, 2006.
57. Zhang, L., Wu, J., Ruan KH. Solution structure of the first intracellular loop of prostacyclin receptor and implication of its interaction with the C-terminal segment of G alpha S protein. Biochemistry 45, 1734-1744, 2006.
58. Zhang L, Bastepe M, Juppner H, Ruan KH. Characterization of the molecular mechanisms of the coupling between intracellular loops of prostacyclin receptor with the C-terminal domain of the Galphas protein in human coronary artery smooth muscle cells. Arch Biochem Biophys. Jul 25, 2006.
59. Ruan KH, Deng H, So SP. Engineering of a protein with cyclooxygenase and prostacyclin synthase activities that converts arachidonic acid to prostacyclin. Biochemistry. 2006 45(47):14003-14011.
60. Ruan KH, Wu J, Cervantes V. Characterization of the Substrate Mimic Bound to Engineered Prostacyclin Synthase in Solution Using High-Resolution NMR Spectroscopy and Mutagenesis: Implication of the Molecular Mechanism in Biosynthesis of Prostacyclin. Biochemistry. 2008 Biochemistry. 47(2):680-688.
61. Wu J, Feng M, Ruan KH. Assembling NMR structures for the intracellular loops of the human thromboxane A2 receptor: Implication of the G protein-coupling pocket. Arch Biochem Biophys. 2008;470(1):73-82.
62. Ni F, So SP, Cervantes V, Ruan KH. A profile of the residues in the second extracellular loop that are critical for ligand recognition of human prostacyclin receptor. FEBS J. 2008;275(1):128-137.

                      
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