Abstract:
:In Spodoptera frugiperda (SF IPLB-21) cells productively infected with S. frugiperda multicapsid nuclear polyhedrosis virus (SfMNPV), we observed the synthesis of infected-cell-specific polypeptides (ICSPs) using the protein synthesis inhibitor cycloheximide (CX) and the DAN synthesis inhibitor cytosine arabinoside (Ara-C) in an attempt to assess whether a temporal cascade and viral DNA synthesis are involved in the gene expression program of SfMNPV. Inhibition of protein synthesis with CX at 0 h postinfection resulted in the active synthesis of a group of ICSPs immediately after removal of CX, suggesting that these polypeptides, designated alpha-ICSP, did not require de novo protein synthesis for their production. A second group of ICSPs (designated beta-ICSPs), requiring a prior interval of protein synthesis, was detected when CX was added at later times. A third group of ICSPs also needed an interval of ICSP synthesis, but differed from beta-ICSPs in that they required a longer interval of protein synthesis. Moreover, the synthesis of most of these ICSPs also required DNA synthesis, which was demonstrated by addition of Ara-C before and after viral DNA replication; these ICSPs were therefore designated gamma-ICSPs. In conclusion, two kinds of regulatory processes are involved in SfMNPV infection: the first process controls the sequential synthesis of the tree ICSP groups, that is alpha-->beta-->gamma; a second process represses the synthesis of ICSP groups, first of the alpha-ICSPs and subsequently of beta-ICSPs. Thus, we propose temporally regulated as well as negative control circuits in SfMNPV gene expression.
journal_name
Intervirologyjournal_title
Intervirologyauthors
Liu HS,Bilimoria SLdoi
10.1159/000150520subject
Has Abstractpub_date
1997-01-01 00:00:00pages
50-4issue
1eissn
0300-5526issn
1423-0100journal_volume
40pub_type
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