Expanding Repertoire of Plant Positive-Strand RNA Virus Proteases.
Viruses
; 11(1)2019 01 15.
Article
in En
| MEDLINE
| ID: mdl-30650571
ABSTRACT
Many plant viruses express their proteins through a polyprotein strategy, requiring the acquisition of protease domains to regulate the release of functional mature proteins and/or intermediate polyproteins. Positive-strand RNA viruses constitute the vast majority of plant viruses and they are diverse in their genomic organization and protein expression strategies. Until recently, proteases encoded by positive-strand RNA viruses were described as belonging to two categories (1) chymotrypsin-like cysteine and serine proteases and (2) papain-like cysteine protease. However, the functional characterization of plant virus cysteine and serine proteases has highlighted their diversity in terms of biological activities, cleavage site specificities, regulatory mechanisms, and three-dimensional structures. The recent discovery of a plant picorna-like virus glutamic protease with possible structural similarities with fungal and bacterial glutamic proteases also revealed new unexpected sources of protease domains. We discuss the variety of plant positive-strand RNA virus protease domains. We also highlight possible evolution scenarios of these viral proteases, including evidence for the exchange of protease domains amongst unrelated viruses.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Peptide Hydrolases
/
Plant Viruses
/
RNA Viruses
/
Viral Proteins
Language:
En
Journal:
Viruses
Year:
2019
Document type:
Article
Affiliation country: