Optical diffraction analysis of electron microscope images of tubular structures found in cells infected with herpes simplex virus type 2

In vitro assembly of bovine rotavirus nucleocapsid protein

The nucleocapsid protein (VP6) of bovine rotavirus was purified from in vitro-derived single shelled particles by CaCl2 or LiCl treatment. The protein exhibits polymorphism. Specifically, hexamers and small hexagonal lattices were present in many of the samples. Tubular particles formed between pH 5.0 and 9.0 were moderately stable to changes in temperature and ionic strength and were shown to be composed of nucleocapsid protein. Their formation is fully reversible. Spherical particles resembling single-shelled virus formed at pH 4.0. A novel structure in the form of sheets composed of a small-hole lattice formed in samples shifted from pH 6.0 to 4.0. The results demonstrate the importance of the nucleocapsid protein and of protein-protein interactions for rotavirus assembly.

Double infection of the CNS with herpes simplex and mumps viruses. Serological and ultrastructural studies

Clinical, serological and ultrastructural features are described in a case of acute encephalitis. The ultrastructural study of brain biopsy specimens revealed herpes-and paramyxovirus-like particles in neurons and glial cells that were characterized as herpes simplex and mumps viruses by serological study in serum and CSF. Of the few cases previously reported with double encephalitis, this is the only one in which ultrastructural and serological evidence of combined brain infection has been found.

Filamentous structures associated with Epstein-Barr virus-infected cells

After the onset of Epstein-Barr virus DNA and protein synthesis 10 h after superinfection of Raji cells (a cell line containing Epstein-Barr virus DNA but not producing virus), filamentous structures 25 nm in diameter and 0.2 to 1.4 micrometers in length could be detected in the cell cytoplasm by electron microscopy. These structures banded in metrizamide gradients with viral DNA and proteins, but at a density different from that of virions or nucleocapsids. These filaments, enriched in a 155,000-dalton protein similar in size to a major nucleocapsid protein of Epstein-Barr virus, may represent intermediates in viral nucleocapsid assembly.

Herpes simplex virus (HSV) infection of organotypic nerve cell cultures. Tubule-like structures in the nuclei of cells infected with type 2 but not with type 1 virus

In HSV-2 infected cultures, intranuclear tubule-like structures were found more commonly in fibroblasts and central nervous system (CNS) neurons than in oligodendrocytes, astrocytes, satellite and Schwann cells, but were found least often in peripheral neurons.