cis-Acting sequences required for coat protein binding and in vitro assembly of Potato virus X.
The 5' region of Potato virus X (PVX) RNA containing an AC-rich single-stranded region and stem-loop 1 (SL1) has been shown to be important for PVX replication (Miller, E.D., Plante, C.A., Kim, K.-H., Brown, J.W., Hemenway, C., 1998. Stem-loop structure in the 5' region of potato virus X genome required for plus-strand RNA accumulation. J. Mol. Biol. 284, 591-608.). Here, we describe the involvement of SL1 for binding to the PVX coat protein (CP) using an in vitro assembly system and various deletion mutants of the 5' region of PVX RNA. Internal and 5' terminal deletions of the 5'-nontranslated region of PVX RNA were assessed for their effects on formation of assembled virus-like particles (VLPs). Mutant RNAs that contain the top region of SL1 or sequences therein bound to CP to form VLPs. In contrast, transcripts of mutants that disrupt SL1 RNA structure were unable to form VLPs. SELEX was used to further confirm the specific RNA recognition of PVX CP using RNA transcripts containing randomized sequences of the upper portion of SL1. Wild-type (wt) sequences along with many other sequences that resemble SL1 structure were selected after fourth and fifth rounds of SELEX (27.0% and 44.4%, respectively). RNA transcripts from several SELEX winners that are predicted to form stable stem-loop structures very closely resembling wt PVX SL1 VLPs. RNA transcripts not predicted to form secondary structures similar to SL1 did not form VLPs in vitro. Taken together, our results suggest that RNA secondary structural elements within SL1 and/or sequences therein are crucial for formation of VLPs and are required for the specific recognition by the CP subunit.
Kwon
Sun-Jung
SJ
School of Agricultural Biotechnology and Center for Plant Molecular Genetics and Breeding Research, Seoul National University, Seoul 151-921, Korea.
Park
Mi-Ri
MR
Kim
Ki-Woo
KW
Plante
Carol A
CA
Hemenway
Cynthia L
CL
Kim
Kook-Hyung
KH
D020121:5' Untranslated Regions; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D036022:Capsid Proteins / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism*; D004279:DNA, Viral / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D005816:Genetic Complementation Test; D008854:Microscopy, Electron; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D017863:Potexvirus / Q000235:genetics* / Q000502:physiology* / Q000648:ultrastructure; D011485:Protein Binding; D012367:RNA, Viral / Q000737:chemistry / Q000235:genetics; D011994:Recombinant Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D019065:Virus Assembly / Q000235:genetics
D020121:5' Untranslated Regions; D036022:Capsid Proteins; D004279:DNA, Viral; D012367:RNA, Viral; D011994:Recombinant Proteins; C058750:coat protein, Potato virus X