scholarly journals Cis-acting RNA elements in positive-strand RNA plant virus genomes

Virology ◽  
2015 ◽  
Vol 479-480 ◽  
pp. 434-443 ◽  
Author(s):  
Laura R. Newburn ◽  
K. Andrew White
Keyword(s):  
Plant Virus ◽  
Positive Strand ◽  
Cis Acting ◽  
Rna Elements ◽  
Positive Strand Rna ◽  
Virus Genomes

scholarly journals Functionally interchangeable cis-acting RNA elements in both genome segments of a picorna-like plant virus

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Jiangbo Guo ◽  
Junping Han ◽  
Junyan Lin ◽  
John Finer ◽  
Anne Dorrance ◽  
...  
Keyword(s):  
Plant Virus ◽  
Cis Acting ◽  
Rna Elements

scholarly journals Differential Roles of Hsp70 and Hsp90 in the Assembly of the Replicase Complex of a Positive-Strand RNA Plant Virus

2012 ◽  
Vol 86 (22) ◽  
pp. 12091-12104 ◽  
Author(s):  
A. Mine ◽  
K. Hyodo ◽  
Y. Tajima ◽  
K. Kusumanegara ◽  
T. Taniguchi ◽  
...  
Keyword(s):  
Plant Virus ◽  
Positive Strand ◽  
Replicase Complex ◽  
Positive Strand Rna

Mechanism of Zinc Ejection by Disulfiram in Nonstructural Protein 5A

2021 ◽  
Author(s):  
Ashfaq Ur Rehman ◽  
Guodong Zheng ◽  
Bozitao Zhong ◽  
Duan Ni ◽  
Jia-Yi Li ◽  
...  
Keyword(s):  
Hepatitis C Virus ◽  
Hepatitis C ◽  
Nonstructural Protein ◽  
Structural Protein ◽  
Positive Strand ◽  
Positive Strand Rna ◽  
Nonstructural Protein 5A

Hepatitis C virus (HCV) is a notorious member of the enveloped, positive-strand RNA flavivirus family. Non-structural protein 5A (NS5A) plays a key role in HCV replication and assembly. NS5A is...

scholarly journals Strawberry Mottle Virus (Family Secoviridae, Order Picornavirales) Encodes a Novel Glutamic Protease To Process the RNA2 Polyprotein at Two Cleavage Sites

2018 ◽  
Vol 93 (5) ◽  
Author(s):  
Krin S. Mann ◽  
Joan Chisholm ◽  
Hélène Sanfaçon
Keyword(s):  
Cysteine Proteases ◽  
Terminal Region ◽  
Mottle Virus ◽  
Cleavage Sites ◽  
Virus Family ◽  
Positive Strand ◽  
Viral Proteases ◽  
Bipartite Genome ◽  
The Family ◽  
Positive Strand Rna

ABSTRACT Strawberry mottle virus (SMoV) belongs to the family Secoviridae (order Picornavirales) and has a bipartite genome with each RNA encoding one polyprotein. All characterized secovirids encode a single protease related to the picornavirus 3C protease. The SMoV 3C-like protease was previously shown to cut the RNA2 polyprotein (P2) at a single site between the predicted movement protein and coat protein (CP) domains. However, the SMoV P2 polyprotein includes an extended C-terminal region with a coding capacity of up to 70 kDa downstream of the presumed CP domain, an unusual characteristic for this family. In this study, we identified a novel cleavage event at a P↓AFP sequence immediately downstream of the CP domain. Following deletion of the PAFP sequence, the polyprotein was processed at or near a related PKFP sequence 40 kDa further downstream, defining two protein domains in the C-terminal region of the P2 polyprotein. Both processing events were dependent on a novel protease domain located between the two cleavage sites. Mutagenesis of amino acids that are conserved among isolates of SMoV and of the related Black raspberry necrosis virus did not identify essential cysteine, serine, or histidine residues, suggesting that the RNA2-encoded SMoV protease is not related to serine or cysteine proteases of other picorna-like viruses. Rather, two highly conserved glutamic acid residues spaced by 82 residues were found to be strictly required for protease activity. We conclude that the processing of SMoV polyproteins requires two viral proteases, the RNA1-encoded 3C-like protease and a novel glutamic protease encoded by RNA2. IMPORTANCE Many viruses encode proteases to release mature proteins and intermediate polyproteins from viral polyproteins. Polyprotein processing allows regulation of the accumulation and activity of viral proteins. Many viral proteases also cleave host factors to facilitate virus infection. Thus, viral proteases are key virulence factors. To date, viruses with a positive-strand RNA genome are only known to encode cysteine or serine proteases, most of which are related to the cellular papain, trypsin, or chymotrypsin proteases. Here, we characterize the first glutamic protease encoded by a plant virus or by a positive-strand RNA virus. The novel glutamic protease is unique to a few members of the family Secoviridae, suggesting that it is a recent acquisition in the evolution of this family. The protease does not resemble known cellular proteases. Rather, it is predicted to share structural similarities with a family of fungal and bacterial glutamic proteases that adopt a lectin fold.

5' and 3' cis-Acting RNA Elements Required for RNA Replication of Porcine Reproductive and Respiratory Syndrome Virus

2007 ◽  
Vol 37 (3) ◽  
pp. 193 ◽  
Author(s):  
Shien-Young Kang ◽  
Yu-Jeong Choi ◽  
Sang-Im Yun ◽  
Byung-Hak Song ◽  
Young-Min Lee
Keyword(s):  
Rna Replication ◽  
Respiratory Syndrome Virus ◽  
Cis Acting ◽  
Rna Elements
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