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. 1989 Nov;63(11):4715–4728. doi: 10.1128/jvi.63.11.4715-4728.1989

A host cell protein binds to a highly conserved sequence element (pac-2) within the cytomegalovirus a sequence.

G W Kemble 1, E S Mocarski 1
PMCID: PMC251108  PMID: 2552148

Abstract

The human cytomegalovirus (CMV) a sequence has significant homology to two regions, pac-1 and pac-2, within the a sequence of herpes simplex virus type 1 (HSV-1). Both regions have been shown to be important cis-acting signals in HSV-1 genome maturation. We have demonstrated that a small fragment from within the CMV a sequence, containing the pac-1 and pac-2 motifs, carries all of the signals necessary for generation of genomic termini and for inversion. These observations indicated that the function of these highly conserved sequence motifs was similar in CMV and HSV-1. We have identified and partially purified a host cell protein with affinity for the sequence 5'-GGCGGCGGCGCATAAAA-3' within CMV pac-2. This partially purified protein has an apparent molecular weight of 89,000 under denaturing conditions and could be renatured after sodium dodecyl sulfate-polyacrylamide gel electrophoresis, suggesting that the capacity to bind DNA was the property of a single polypeptide chain. This activity was found in a wide variety of human cell lines, including those that are permissive as well as those that are nonpermissive for CMV growth, but not in cell lines from monkey, mouse, or drosophila origins. Our work implicates a host cell protein in a sequence function.

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