scholarly journals Human respiratory syncytial virus methyl transferase: a potential antiviral target?

F1000Research ◽  
2019 ◽  
Vol 8 ◽  
pp. 750
Author(s):  
Raj Kalkeri ◽  
Govinda Bhisetti ◽  
Nagraj Mani
Keyword(s):  
Respiratory Syncytial Virus ◽  
Viral Replication ◽  
Sequence Similarity ◽  
Human Respiratory Syncytial Virus ◽  
Methyl Transferase ◽  
Mtase Activity ◽  
Literature Reviews ◽  
Host Innate Immune Response ◽  
Syncytial Virus

Human respiratory syncytial virus (HRSV) causes bronchiolitis and pneumonia. The role of methyltransferase (MTase) activity of HRSV polymerase in viral replication is unknown. Literature reviews of similar viral MTases and homology- modeling of RSV MTase bound to GTP and S-adenosylmethionine (SAM) have shown sequence similarity and the conserved catalytic residues (K-D-K-E) and the SAM-binding (GXGXG) domain. Combined with the recent reports of the importance of 2’O methylation of viral RNAs in the host innate immune response evasion, and its proposed role in viral replication, HRSV MTase holds promise as a potential antiviral target. Further biological validation of HRSV MTase could facilitate the discovery of novel HRSV antivirals targeting MTase enzyme activity.

scholarly journals Human respiratory syncytial virus methyl transferase: a potential antiviral target?

F1000Research ◽  
2019 ◽  
Vol 8 ◽  
pp. 750
Author(s):  
Raj Kalkeri ◽  
Govinda Bhisetti ◽  
Nagraj Mani
Keyword(s):  
Respiratory Syncytial Virus ◽  
Viral Replication ◽  
Sequence Similarity ◽  
Human Respiratory Syncytial Virus ◽  
Methyl Transferase ◽  
Mtase Activity ◽  
Literature Reviews ◽  
Host Innate Immune Response ◽  
Syncytial Virus

Human respiratory syncytial virus (HRSV) causes bronchiolitis and pneumonia. The role of methyltransferase (MTase) activity of HRSV polymerase in viral replication is unknown. Literature reviews of similar viral MTases and homology- modeling of RSV MTase bound to GTP and S-adenosylmethionine (SAM) have shown sequence similarity and the conserved catalytic residues (K-D-K-E) and the SAM-binding (GXGXG) domain. Combined with the recent reports of the importance of 2’O methylation of viral RNAs in the host innate immune response evasion, and its proposed role in viral replication, HRSV MTase holds promise as a potential antiviral target. Further biological validation of HRSV MTase could facilitate the discovery of novel HRSV antivirals targeting MTase enzyme activity.

scholarly journals Epitope mapping of human respiratory syncytial virus 22K transcription antitermination factor: role of N-terminal sequences in protein folding

2005 ◽  
Vol 86 (4) ◽  
pp. 1103-1107 ◽  
Author(s):  
Blanca García-Barreno ◽  
John Steel ◽  
Monica Payá ◽  
Luis Martínez-Sobrido ◽  
Teresa Delgado ◽  
...  
Keyword(s):  
Protein Folding ◽  
Respiratory Syncytial Virus ◽  
Western Blotting ◽  
Epitope Mapping ◽  
Human Respiratory Syncytial Virus ◽  
N Terminus ◽  
Transcription Antitermination ◽  
Syncytial Virus ◽  
Antibody Epitopes

The reactivity of a panel of 12 monoclonal antibodies raised against the human respiratory syncytial virus 22 kDa (22K) protein was tested by Western blotting with a set of 22K deletion mutants. The results obtained identified sequences in the C-terminal half of the 22K polypeptide required for integrity of most antibody epitopes, except for epitope 112, which was lost in mutants with short N-terminal deletions. This antibody, in contrast to the others, failed to immunoprecipitate the native 22K protein, indicating that the N terminus of this protein is buried in the native molecule and exposed only under the denaturing conditions of Western blotting. In addition, N-terminal deletions that abolished reactivity with monoclonal antibody 112 also inhibited phosphorylation of the 22K protein previously identified at Ser-58 and Ser-61, suggesting that the N terminus is important in regulating the 22K protein phosphorylation status, most likely as a result of its requirement for protein folding.

scholarly journals Role of Cellular Actin in the Gene Expression and Morphogenesis of Human Respiratory Syncytial Virus

Virology ◽  
1998 ◽  
Vol 252 (1) ◽  
pp. 137-148 ◽  
Author(s):  
Emily Burke ◽  
Lesley Dupuy ◽  
Cynthia Wall ◽  
Sailen Barik
Keyword(s):  
Gene Expression ◽  
Respiratory Syncytial Virus ◽  
Human Respiratory Syncytial Virus ◽  
Syncytial Virus

scholarly journals Phosphorylation of human respiratory syncytial virus P protein at threonine 108 controls its interaction with the M2-1 protein in the viral RNA polymerase complex

2006 ◽  
Vol 87 (12) ◽  
pp. 3637-3642 ◽  
Author(s):  
Ana Asenjo ◽  
Enrique Calvo ◽  
Nieves Villanueva
Keyword(s):  
Respiratory Syncytial Virus ◽  
Ion Trap ◽  
Human Respiratory Syncytial Virus ◽  
Viral Rna ◽  
Turnover Rates ◽  
High Turnover ◽  
P Protein ◽  
Syncytial Virus ◽  
Transcription And Replication

The human respiratory syncytial virus (HRSV) P protein is phosphorylated, with different turnover rates, at several serine (S) and threonine (T) residues. The role of phosphothreonines in viral RNA synthesis was studied by using P protein substitution variants and the HRSV-based minigenome pM/SH. By using liquid chromatography coupled to ion-trap mass spectrometry, it was found that P protein T108 was phosphorylated by addition of a high-turnover phosphate group. This phosphorylation occurs in P protein expressed transiently and during HRSV infection. The results suggest that phosphorylation at P protein T108 affects M2-1 transcriptional activities, because this modification prevents interaction between the P and M2-1 proteins. Therefore, P protein phosphorylation–dephosphorylation at T108 could distinguish the role of the P protein in viral transcription and replication.

scholarly journals N6 -Methyladenosine Negatively Regulates Human Respiratory Syncytial Virus Replication

2021 ◽  
Vol 9 ◽  
Author(s):  
Fabian Figueroa ◽  
Alonso Vega-Gibson ◽  
Joseline Catrileo ◽  
Aracelly Gaete-Argel ◽  
Sebastian Riquelme-Barrios ◽  
...  
Keyword(s):  
Respiratory Syncytial Virus ◽  
Viral Replication ◽  
Inclusion Bodies ◽  
Opposite Effect ◽  
Human Respiratory Syncytial Virus ◽  
Genomic Rna ◽  
Syncytial Virus ◽  
Rna Accumulation ◽  
The Impact ◽  
Viral Genomic Rna

N6-methyladenosine (m6A) is the most abundant internal modification described in eukaryotic mRNA and several viral RNA including human respiratory syncytial virus (HRSV). Here, we evaluated the impact of m6A writers, erasers and readers on HRSV genomic RNA accumulation and inclusion bodies assembly during viral replication. We observed that the METTL3/METTL14 m6A writer complex plays a negative role in HRSV protein synthesis and viral titers, while m6A erasers FTO and ALKBH5 had the opposite effect. We also observed that m6A readers YTHDF1-3 bind to the viral genomic RNA inducing a decrease in its intracellular levels and thus, inhibiting viral replication. Finally, we observed that overexpression of YTHDFs proteins caused a decrease in the size of inclusion bodies (IBs), accompanied by an increase in their number. METTL3 knockdown cells showed an opposite effect indicating that the dynamics of IBs assembly and coalescence are strongly affected by m6A readers in a mechanism dependent on m6A writers. Taken together, our results demonstrated that the m6A modification negatively affects HRSV replication, possibly through a mechanism involving the assembly of inclusion bodies, the main factories of viral genomic RNA synthesis.

scholarly journals Protection of mice against Human respiratory syncytial virus by wild-type and aglycosyl mouse–human chimaeric IgG antibodies to subgroup-conserved epitopes on the G glycoprotein

2006 ◽  
Vol 87 (5) ◽  
pp. 1267-1273 ◽  
Author(s):  
C. Mekseepralard ◽  
G. L. Toms ◽  
E. G. Routledge
Keyword(s):  
Respiratory Syncytial Virus ◽  
Human Respiratory Syncytial Virus ◽  
Igg Antibodies ◽  
Wild Type ◽  
Rt Pcr ◽  
Human Infants ◽  
Ns0 Cells ◽  
Heavy Chain Constant Region ◽  
Syncytial Virus

Monoclonal antibodies (mAbs) to conserved epitopes on the G glycoprotein of human respiratory syncytial virus (HRSV) subgroup A fail to neutralize the virus in cell culture in the absence of complement, but are protective in rodent models of infection. They may have potential as prophylactic agents in human infants. In order to investigate the role of Fc-dependent pathways in protection by one such antibody, 1C2, the VH and VL genes were isolated by RT-PCR and assembled with human κ light-chain and human γ1 heavy-chain constant-region genes to form two mouse–human chimaeras, which were expressed in NS0 cells. One of the chimaeras carried a wild-type γ1 chain, whilst the other had an aglycosyl mutation in the CH2 domain rendering the antibody defective in complement activation and FcγR binding. Whilst both chimaeric antibodies exhibited similar avidity for HRSV in ELISA, only the fully glycosylated wild type was capable of neutralizing the virus in the presence of complement. In mice passively immunized with either murine or wild-type γ1 chimaeric antibody, no virus could be recovered from the lungs 4 days after intranasal inoculation of HRSV. In mice immunized with the aglycosyl γ1 chimaera, however, virus was present in the lungs following challenge, although virus titres were significantly reduced compared with controls (P<0·005). These results indicate that the protective effect of this antibody is mediated by both Fc-dependent and Fc-independent pathways.

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