Martin Bisaillon

Learn More
Canine distemper virus (CDV) is a negative-sense, single-stranded RNA virus within the genus Morbillivirus and the family Paramyxoviridae. The Morbillivirus genome is composed of six transcriptional units that are separated by untranslated regions (UTRs), which are relatively uniform in length, with the exception of the UTR between the matrix (M) and fusion(More)
G-quadruplexes (G4) are intricate RNA structures found throughout the transcriptome. Because they are associated with a variety of biological cellular mechanisms, these fascinating structural motifs are seen as potential therapeutic targets against many diseases. While screening of chemical compounds specific to G4 motifs has yielded interesting results, no(More)
Paramecium bursaria chlorella virus, a large DNA virus that replicates in unicellular Chlorella-like algae, encodes an RNA triphosphatase which is involved in the synthesis of the RNA cap structure found at the 5' end of the viral mRNAs. The Chlorella virus RNA triphosphatase is the smallest member of the metal-dependent RNA triphosphatases that include(More)
RNA triphosphatases (RTPases) are involved in the addition of the distinctive cap structure found at the 5' ends of eukaryotic mRNAs. Fungi, protozoa and some DNA viruses possess an RTPase that belongs to the triphosphate tunnel metalloenzyme family of enzymes that can also hydrolyze nucleoside triphosphates. Previous crystallization studies revealed that(More)
The West Nile virus RNA helicase uses the energy derived from the hydrolysis of nucleotides to separate complementary strands of RNA. Although this enzyme has a preference for ATP, the bias towards this purine nucleotide cannot be explained on the basis of specific protein-ATP interactions. Moreover, the enzyme does not harbor the characteristic Q-motif(More)
Influenza A virus seasonal outbreaks and occasional pandemics represent a global health threat. The high genetic instability of this virus permits rapid escape from the host immune system and emergence of resistance to antivirals. There is thus an urgent need to develop novel approaches for efficient treatment of newly emerging strains. Based on a sequence(More)
Decapping enzymes are required for the removal of the 5'-end (m7)GpppN cap of mRNAs to allow their decay in cells. While many cap-binding proteins recognize the cap structure via the stacking of the methylated guanosine ring between two aromatic residues, the precise mechanism of cap recognition by decapping enzymes has yet to be determined. In order to get(More)
The Chlorella virus RNA triphosphatase (cvRTPase) is involved in the formation of the RNA cap structure found at the 5'-end of the viral mRNAs and requires magnesium ions to mediate its catalytic activity. To extend our studies on the role of metal ions in phosphohydrolysis, we have used a combination of fluorescence spectroscopy, circular dichroism,(More)
RNA cap binding proteins have evolved to specifically bind to the N7-methyl guanosine cap structure found at the 5' ends of eukaryotic mRNAs. The specificity of RNA capping enzymes towards GTP for the synthesis of this structure is therefore crucial for mRNA metabolism. The fact that ribavirin triphosphate was described as a substrate of a viral RNA capping(More)
Alternative splicing (AS) is a central mechanism of genetic regulation which modifies the sequence of RNA transcripts in higher eukaryotes. AS has been shown to increase both the variability and diversity of the cellular proteome by changing the composition of resulting proteins through differential choice of exons to be included in mature mRNAs. In the(More)