The proposed project involves the use of low energy (1 keV-10 keV) beams of Ar+, Xe+, or N2+ to study the structures of human adenovirus type 2 (adenovirus 2) and equine herpes virus type 1 (EHV-1). The experimental strategy is to employ ion beams with limited (5.0nm-15.0nm) penetrating power to etch or erode the virus surface progressively from the outside toward the center of the particle. At various stages of the etching process irradiated virions will be examined in the electron microscope to assess the extent of erosion. Preliminary experiments have shown clearly that as outer layers of the virus are eroded away, internal components become visible in shadowed preparations. The results of electron microscopic analyses will be correlated with biochemical studies, involving SDS-polyacrylamide gel electrophoresis, to determine the effects of etching on specific viral polypeptides. This correlation should allow one to identify the protein components of viral structures revealed after different amounts of etching. Similarly, the DNA component of etched virions will be examined, by agarose gel electrophoresis, to identify regions of the viral DNA closest to the particle surface. This overall analysis will clarify the structure of the adenovirus 2 core and provide definitive information about the location of viral proteins V and VI. Ion etching of EHV-1 should reveal the structure of the tegument layer and its polypeptide composition. Analysis of EHV-1 nucleocapsids should clarify the arrangement of DNA in these structures and allow one to determine the polypeptide composition of the core found in the center of the DNA-containing torroid.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM034036-03
Application #
3284449
Study Section
Virology Study Section (VR)
Project Start
1984-07-01
Project End
1987-06-30
Budget Start
1986-07-01
Budget End
1987-06-30
Support Year
3
Fiscal Year
1986
Total Cost
Indirect Cost
Name
University of Virginia
Department
Type
Schools of Medicine
DUNS #
001910777
City
Charlottesville
State
VA
Country
United States
Zip Code
22904
Newcomb, W W; Trus, B L; Booy, F P et al. (1993) Structure of the herpes simplex virus capsid. Molecular composition of the pentons and the triplexes. J Mol Biol 232:499-511
Mendelson, E C; Newcomb, W W; Brown, J C (1992) Ar+ plasma-induced damage to DNA in bacteriophage lambda: implications for the arrangement of DNA in the phage head. J Virol 66:2226-31
Trus, B L; Newcomb, W W; Booy, F P et al. (1992) Distinct monoclonal antibodies separately label the hexons or the pentons of herpes simplex virus capsid. Proc Natl Acad Sci U S A 89:11508-12
Booy, F P; Newcomb, W W; Trus, B L et al. (1991) Liquid-crystalline, phage-like packing of encapsidated DNA in herpes simplex virus. Cell 64:1007-15
Baker, T S; Newcomb, W W; Olson, N H et al. (1991) Structures of bovine and human papillomaviruses. Analysis by cryoelectron microscopy and three-dimensional image reconstruction. Biophys J 60:1445-56
Newcomb, W W; Brown, J C (1991) Structure of the herpes simplex virus capsid: effects of extraction with guanidine hydrochloride and partial reconstitution of extracted capsids. J Virol 65:613-20
Baker, T S; Newcomb, W W; Booy, F P et al. (1990) Three-dimensional structures of maturable and abortive capsids of equine herpesvirus 1 from cryoelectron microscopy. J Virol 64:563-73
Newcomb, W W; Brown, J C (1989) Use of Ar+ plasma etching to localize structural proteins in the capsid of herpes simplex virus type 1. J Virol 63:4697-702
Newcomb, W W; Brown, J C; Booy, F P et al. (1989) Nucleocapsid mass and capsomer protein stoichiometry in equine herpesvirus 1: scanning transmission electron microscopic study. J Virol 63:3777-83
Salerno, J C; Bolgiano, B; Ingledew, W J (1989) Potentiometric titration of cytochrome-bo type quinol oxidase of Escherichia coli: evidence for heme-heme and copper-heme interaction. FEBS Lett 247:101-5

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