Rolling circle DNA replication by extracts of herpes simplex virus type 1-infected human cells.

Abstract:

Whole-cell extracts of herpes simplex virus type 1-infected human cells (293 cells) can promote the rolling circle replication of circular duplex DNA molecules. The products of the reaction are longer than monomer unit length and are the result of semiconservative DNA replication by the following criteria: (i) resistance to DpnI and susceptibility to MboI restriction enzymes, (ii) shift in density on a CsCl gradient of the products synthesized in the presence of bromo-dUTP to a position on the gradient consistent with those of molecules composed mainly of one parental DNA strand and one newly synthesized DNA strand, and (iii) the appearance in the electron microscope of molecules consisting of duplex circles with multiunit linear appendages, a characteristic of a rolling circle mode of DNA replication. The reaction requires ATP and is dependent on herpes simplex virus type 1-encoded DNA polymerase.

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