Abstract
We have characterized an immunosuppressive parvovirus related to the minute virus of mice (MVM). The parvovirus, MVM(i), grew efficiently on the murine lymphoma cell line EL-4 and not on the A-9 strain of L-cells which is a host for the prototype MVM. MVM(i) was immunosuppressive for allogeneic mixed leukocyte cultures, inhibiting the generation of cytolytic T lymphocytes. MVM had no effect on mixed leukocyte cultures. MVM and MVM(i) particles were similar in buoyant density, sedimentation rate, appearance in the electron microscope, and polypeptide composition. We present restriction enzyme maps of the DNAs of MVM and MVM(i) which show that they are closely related. Out of 109 restriction endonuclease cleavage sites (representing together about 10% of the nucleotide sequence), 86 sites were shared by MVM and MVM(i), whereas 22 sites were absent from one of the two viruses. MVM(i) DNA had an apparent deletion of about 60 nucleotides relative to MVM, located near the 5' terminus of viral DNA.
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