Robert J. Geraghty, PhD

Associate Professor, Center for Drug Design (CDD)

Robert J. Geraghty

Contact Info

Office Phone 612-625-3281

Office Address:
7-222 Phillips Wangensteen Building
516 Delaware Street SE
Minneapolis, MN 55455

Mailing Address:
516 Delaware Street SE
MMC 204
Minneapolis, MN 55455

PhD, University of Wisconsin (Oncology), 1995

BS, University of Minnesota (Genetics and Cell Biology), 1988

Research

Research Summary/Interests

Anti-Viral Drug Discovery Our main interests are identifying anti-viral drug targets for major human pathogens and evaluating small molecules for their ability to inhibit those targets and virus replication. We employ three main approaches to uncover small molecules that inhibit the replication and pathogenesis of viruses: (1) Conduct phenotypic screens to evaluate anti-viral activity of small molecules. (2) Collaborate with medicinal chemists, computational chemists and structural biologists to rationally design small molecule inhibitors of established and novel viral drug targets. (3) Design and implement high throughput screening to identify small molecules that inhibit known and novel viral drug targets. Investigation of Aspects of Virus Replication We are investigating aspects of virus replication for the following viruses - For the Flaviviruses hepatitis C virus and West Nile virus as well as the Orthomyxovirus influenza A virus, we have active projects to identify inhibitors of the respective viral polymerases. We are also interested in identifying inhibitors of cellular factors that those viruses must use to replicate. We are currently studying two Herpesviruses, herpes simplex virus (HSV) and cytomegalovirus (CMV). We have a long-standing interest in understanding the molecular details of HSV entry into cells. We are interested in the entire process of virus entry including binding to cells, fusion of the viral membrane with cell membranes either at the plasma membrane or in an endocytic vesicle, and the role of pH in the entry/fusion process. We continue to study the expression of the major viral surface proteins, their incorporation onto virus particles, and their roles in cell binding and membrane fusion. The ultimate goal of these studies is to identify steps in virus entry that are most susceptible to inhibition using small molecules such as organic compounds or small proteins/peptides. The beta herpesvirus CMV is a major pathogen for neonates and the immune compromised. We are taking a target-based approach to interrogate viral enzymes with known and novel chemotypes to identify inhibitors. The viral enzyme inhibitors identified are then screened for their ability to inhibit virus replication in cell culture. Other interests We have collaborative projects looking at novel targets and anti-virals for human immunodeficiency virus and also to understand the entry of coronaviruses into cells.

Patents

  • Wang, Z.; Geraghty, R. J.; Vince, R.; Tang, J. (University of Minnesota, USA). N-Hydroxypyrimidine-2,4-diones as inhibitors of HIV and HCV and their preparation. Application: WO 20111005.; SciFinder Scholar 2012:533369.
  • Spear, P.G., Geraghty, R.J., Martinez, W.M., Montgomery, R.I., Warner, M.S., Cohen, G.H., Eisenberg, R.J., Whitbeck, C.J., and Krummenacher, C. Cellular Proteins Which Mediate Herpesvirus Entry, U.S. Patent # 6,641,818. 2000.

Publications

  • Ai, T.; Xu, Y.; Qiu, L.; Geraghty, R. J.; Chen, L. Hydroxamic acids block replication of hepatitis C virus. J. Med. Chem. 2014, published online (DOI: 10.1021/jm501330g)
  • Zhou, W., Duckworth, B. P.; Geraghty, R. J. Fluorescent peptide sensors for tyrosylprotein sulfotransferase activity. Anal. Biochem. 2014, 461, 1-6.

AHCCDD2 - Content - Image - TOC Graphic Geraghty

  • Vernekar, S. K. V.; Qiu, L.; Zacharias, J.; Geraghty, R. J.; Wang, Z. Synthesis and antiviral evaluation of 4’-(1,2,3-triazol-1-yl)thymidines. Med. Chem. Commun. 2014, 5, 603-608.
  • Zhou, W.; Chen, F.; Klyachkin, Y.; Sham, Y. Y.; Geraghty, R. J.; Mutations in the amino terminus of herpes simplex virus type 1 gL can reduce cell-cell fusion without affecting gH/gL trafficking. J. Virol. 2013, 88, 739-744.
  • Wu, K.; Peng, G.; Wilken, M.; Geraghty, R. J.; Li, F. Mechanisms of host receptor adaptation by severe acute respiratory syndrome coronavirus. J. Biol. Chem. 2012, 287, 8904-8911.
  • Chen, Y.-L.; Zacharias, J.; Vince, R.; Geraghty, R. J.; Wang, Z. C-6 Aryl substituted 4-quinolone-3-carboxylic acids as inhibitors of hepatitis C virus. Bioorg. Med. Chem. 2012, 20, 4790-4800.
  • Chen, Y.-L.; Tang, J.; Kesler, M. J.; Sham, Y. Y.; Vince, R.; Geraghty, R. J.; Wang, Z. The design, synthesis and biological evaluations of C-6 or C-7 substituted 2-hydroxyisoquinoline-1,3-diones as inhibitors of hepatitis C virus. Bioorg. Med. Chem. 2012, 20, 467-479.

AHCCDD2-Image-Geraghty TOC Graphic2

  • Wu, K.; Chen, L.; Peng, G.; Zhou, W.; Pennell, C. A.; Mansky, L. M.; Geraghty, R. J.; Li, F. A virus-binding hot spot on human angiotensin-converting enzyme 2 is critical for binding of two different coronaviruses. J. Virol. 2011, 85, 5331-5337.
  • Klyachkin, Y. M.; Geraghty, R. J. Mutagenic analysis of herpes simplex virus type 1 glycoprotein L reveals the importance of an arginine-rich region for function. Virology 2008, 374, 23-32.
  • Subramanian, R. P.; Geraghty, R. J. Herpes simplex virus type 1 mediates fusion through a hemifusion intermediate by sequential activity of glycoproteins D, H, L, and B. Proc. Natl. Acad. Sci. U. S. A. 2007, 104, 2903-2908.
  • Klyachkin, Y. M.; Stoops, K. D.; Geraghty, R. J. Herpes simplex virus type 1 glycoprotein L mutants that fail to promote trafficking of glycoprotein H and fail to function in fusion can induce binding of glycoprotein L-dependent anti-glycoprotein H antibodies. J. Gen. Virol. 2006, 87, 759-767.

AHCCDD2-Image-Geraghty TOC Graphic3

  • Even, D. L.; Henley, A. M.; Geraghty, R. J. The requirements for herpes simplex virus type 1 cell-cell spread via nectin-1 parallel those for virus entry. Virus Res. 2006, 119, 195-207.
  • Subramanian, R. P.; Dunn, J. E.; Geraghty, R. J. The nectin-1? transmembrane domain, but not the cytoplasmic tail, influences cell fusion induced by HSV-1 glycoproteins. Virology 2005, 339, 176-191.
  • Jones, N. A.; Geraghty, R. J. Fusion activity of lipid-anchored envelope glycoproteins of herpes simplex virus type 1. Virology 2004, 324, 213-228.
  • Terry-Allison, T.; Montgomery, R. I.; Warner, M. S.; Geraghty, R. J.; Spear, P. G. Contributions of gD receptors and glycosaminoglycan sulfation to cell fusion mediated by herpes simplex virus 1. Virus Res. 2001, 74, 39-45.
  • Geraghty, R. J.; Fridberg, A.; Krummenacher, C.; Cohen, G. H.; Eisenberg, R. J.; Spear, P. G. Use of chimeric nectin-1(HveC)-related receptors to demonstrate that ability to bind alphaherpesvirus gD is not necessarily sufficient for viral entry. Virology 2001, 285, 366-375.
  • Baury, B.; Geraghty, R. J.; Masson, D.; Lustenberger, P.; Spear, P. G.; Denis, M. G. Organization of the rat Tage4 gene and herpesvirus entry activity of the encoded protein. Gene 2001, 265, 185-194.
  • Geraghty, R. J.; Jogger, C. R.; Spear, P. G. Cellular expression of alphaherpesvirus gD interferes with entry of homologous and heterologous alphaherpesviruses by blocking access to a shared gD receptor. Virology 2000, 268, 147-158.
  • Krummenacher, C.; Rux, A. H.; Whitbeck, J. C.; Ponce-De-Leon, M.; Lou, H.; Baribaud, I.; Hou, W.; Zou, C.; Geraghty, R. J.; Spear, P. G.; Eisenberg, R. J.; Cohen, G. H. The first immunoglobulin-like domain of HveC is sufficient to bind herpes simplex virus gD with full affinity, while the third domain is involved in oligomerization of HveC. J. Virol. 1999, 73, 8127-8137.
  • Warner, M. S.; Geraghty, R. J.; Martinez, W. M.; Montgomery, R. I.; Whitbeck, C.; Xu, R.; Eisenberg, R. J.; Cohen, G. H.; Spear, P. G. A cell surface protein with herpesvirus entry activity (HveB) confers susceptibility to infection by mutants of herpes simplex virus type 1, herpes simplex virus type 2, and pseudorabies virus. Virology 1998, 246, 179-189.
  • Krummenacher, C.; Nicola, A. V.; Whitbeck, J. C.; Lou, H.; Hou, W.; Lambris, J. D.; Geraghty, R. J.; Spear, P. G.; Cohen, G. H.; Eisenberg, R. J. Herpes simplex virus glycoprotein D can bind to poliovirus receptor-related protein 1 or herpesvirus entry mediator, two structurally unrelated mediators of virus entry. J. Virol. 1998, 72, 7064-7074.
  • Geraghty, R. J.; Krummenacher, C.; Cohen, G. H.; Eisenberg, R. J.; Spear, P. G. Entry of alphaherpesviruses mediated by poliovirus receptor-related protein 1 and poliovirus receptor. Science 1998, 280, 1618-1620.
  • Schwartz, M. D.; Geraghty, R. J.; Panganiban, A. T. HIV-1 particle release mediated by Vpu is distinct from that mediated by p6. Virology 1996, 224, 302-309.
  • Geraghty, R. J.; Talbot, K. J.; Callahan, M.; Harper, W.; Panganiban, A. T. Cell type-dependence for Vpu function. J. Med. Primatol. 1994, 23, 146-150.
  • Geraghty, R. J.; Panganiban, A. T. Human immunodeficiency virus type 1 Vpu has a CD4- and an envelope glycoprotein-independent function. J. Virol. 1993, 67, 4190-4194.