Rapid visualization at high resolution of pathogens by atomic force microscopy: structural studies of herpes simplex virus-1.

A relatively crude preparation of herpes simplex virus was rapidly visualized by atomic force microscopy after exposure to conditions that produced gradual degradation of the virions. Images were obtained of 1) the intact, enveloped virus; 2) the underlying capsid with associated tegument proteins along with fragments of the membrane; 3) the capsomeres composing the capsid and their surface arrangement; 4) damaged and partially degraded capsids with missing capsomeres; and 5) the DNA extruded from damaged virions. These images provide a unique perspective on the structures of individual virus particles.