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The role of viral protein Ac34 in nuclear relocation of subunits of the actin-related protein 2/3 complex

Content Provider	Springer Nature Link
Author	Mu, Jingfang Zhang, Yongli Hu, Yangyang Hu, Xue Zhou, Yuan Chen, Xinwen Wang, Yun
Copyright Year	2016
Abstract	The actin nucleator actin-related protein complex (Arp2/3) is composed of seven subunits: Arp2, Arp3, p40/ARPC1 (P40), p34/ARPC2 (P34), p21/ARPC3 (P21), p20/ARPC4 (P20), and p16/ARPC5 (P16). Arp2/3 plays crucial roles in a variety of cellular activities through regulation of actin polymerization. Autographa californica multiple nucleopolyhedrovirus (AcMNPV), one of the beststudied alphabaculoviruses, induces Arp2/3 nuclear relocation and mediates nuclear actin polymerization to assist in virus replication. We have demonstrated that Ac34, a viral late-gene product, induces translocation of the P40 subunit of Arp2/3 to the nucleus during AcMNPV infection. However, it remains unknown whether Ac34 could relocate other Arp2/3 subunits to the nucleus. In this study, the effects of the viral protein Ac34 on the distribution of these subunits were studied by an immunofluorescence assay. Arp2, P34, P21, and P20 cloned from Spodoptera frugiperda (Sf9) cells showed mainly cytoplasmic localization and were relocated to the nucleus in the presence of Ac34. In addition, Arp3 was localized in the cytoplasm in both the presence and absence of Ac34, and P16 showed whole-cell localization. In contrast to Sf9 cells, all subunits of mammalian Arp2/3 showed no nuclear relocation in the presence of Ac34. Co-immunoprecipitation analysis of the interaction between Ac34 and Arp2/3 subunits revealed that Ac34 bound to P40, P34, and P20 of Sf9 cells. However, none of the subunits of mammalian Arp2/3 interacted with Ac34, indicating that protein-protein interaction is essential for Ac34 to relocate Arp2/3 subunits to the nucleus.
Starting Page	480
Ending Page	489
Page Count	10
File Format	PDF
ISSN	16740769
Journal	Virologica Sinica
Volume Number	31
Issue Number	6
e-ISSN	1995820X
Language	English
Publisher	Springer Singapore
Publisher Date	2016-12-05
Publisher Place	Singapore
Access Restriction	Subscribed
Subject Keyword	Autographa californica multiple nucleopolyhedrovirus (AcMNPV) Ac34 Arp2/3 complex nuclear relocation Virology Medical Microbiology Oncology Biochemistry Microbiology Microbial Genetics and Genomics
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Virology Immunology Molecular Medicine

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