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Journal of Virology, November 2001, p. 10829-10842, Vol. 75, No. 22
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.22.10829-10842.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Effects of Deletion and Overexpression of the Autographa californica Nuclear Polyhedrosis Virus FP25K Gene on Synthesis of Two Occlusion-Derived Virus Envelope Proteins and Their Transport into Virus-Induced Intranuclear Membranes

Germán Rosas-Acosta,1 Sharon C. Braunagel,2 and Max D. Summers1,2,3,*

Department of Entomology1 and Department of Biochemistry and Biophysics,3 Texas A&M University, and Texas Agriculture Experimental Station,2 College Station, Texas 77843-2475

Received 12 April 2001/Accepted 11 August 2001

Partial deletions within Autographa californica open reading frame 61 (FP25K) alter the expression and accumulation profile of several viral proteins and the transport of occlusion-derived virus (ODV)-E66 to intranuclear membranes during infection (S. C. Braunagel et al., J. Virol. 73:8559-8570, 1999). Here we show the effects of a full deletion and overexpression of FP25K on the transport and expression of two ODV envelope proteins, ODV-E66 (E66) and ODV-E25 (E25). Deletion and overexpression of FP25K substantially altered the levels of expression of E66 during infection. Compared with cells infected with wild-type (wt) virus, the levels of E66 were reduced fivefold in cells infected with a viral mutant lacking FP25K (Delta FP25K) and were slightly increased in cells infected with a viral mutant overexpressing FP25K (FP25Kpolh). In contrast, no significant changes were observed in the levels of E25 among wt-, Delta FP25K-, and FP25Kpolh-infected cells. The changes observed in the levels of E66 among the different viral mutants were not accompanied by changes in either the time of synthesis, membrane association, protein turnover, or steady-state transcript abundance. Deletion of FP25K also substantially altered the transport and localization of E66 during infection. In cells infected with the Delta FP25K mutant virus, E66 accumulated in localized regions at the nuclear periphery and the outer nuclear membrane and did not traffic to intranuclear membranes. In contrast, in cells infected with the FP25Kpolh mutant virus E66 trafficked to intranuclear membranes. For comparison, E25 was normally transported to intranuclear membranes in both Delta FP25K- and FP25Kpolh-infected cells. Altogether these studies suggest that FP25K affects the synthesis of E66 at a posttranscriptional level, probably by altering the translation of E66; additionally, the block in transport of E66 at the nuclear envelope in Delta FP25K-infected cells suggests that the pathway of E66 trafficking to the inner nuclear membrane and intranuclear microvesicles is specifically regulated and must be influenced by factors that do not control the traffic of E25.

* Corresponding author. Mailing address: Department of Entomology, Texas A&M University, College Station, TX 77843-2475. Phone: (979) 847-9036. Fax: (979) 845-8934. E-mail: m-summers{at}tamu.edu.

Journal of Virology, November 2001, p. 10829-10842, Vol. 75, No. 22
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.22.10829-10842.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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