Negative-sense single-stranded RNA virus

Negative ssRNA Virus
Ebola Virus
Virus classification
Group: Group V ((-)ssRNA)
Order, Family, and Genus

A negative-sense single-stranded RNA virus (or (-)ssRNA virus) is a virus that uses negative sense, single-stranded RNA as its genetic material. Single stranded RNA viruses are classified as positive or negative depending on the sense or polarity of the RNA. The negative viral RNA is complementary to the mRNA and must be converted to a positive RNA by RNA polymerase before translation. Therefore, the purified RNA of a negative sense virus is not infectious by itself, as it needs to be converted to a positive sense RNA for replication. These viruses belong to Group V on the Baltimore classification.[1]

In addition, negative-sense single-stranded RNA viruses have complex genomic sequences, cell cycles, and replication habits which utilize various complexes of proteins in order to arrange itself in specific conformations and carry out necessary processes for proper survival and reproduction of its genomic sequence. The complexity of negative-sense single-stranded RNA viruses carries into its ability to suppress the innate immune response of the cells it infects and the construction of a capsid which is unique to the varying classifications of negative-sense single-stranded RNA viruses.

Replication

Negative sense ssRNA viruses need RNA polymerase to form a positive sense RNA. The positive sense RNA acts as a viral mRNA, which is translated into proteins for the production of new virion materials. With the newly formed virions, more negative sense RNA molecules are produced.

In more details, replication of the virus consists of the following steps:[2][3][4]

  1. A virion enters the host cell and releases its negative RNA into the cytoplasm.
  2. The virus uses its own RNA replicase, also known as RNA-dependent RNA polymerase (RdRp), to form positive RNA template strands through complementary base pairing.
  3. The positive RNA acts as mRNA, which is translated into structural capsomere proteins and viral RdRp by the host's ribosomes.
  4. A replicative complex is formed with RdRp: The positive strands can either function as mRNA to produce more proteins or as template to make more negative RNA strands.
  5. New viral capsids are assembled with the capsomere proteins. The negative RNA strands combine with capsids and viral RdRp to form new negative RNA virions.
  6. After assembly and maturation of nucleocapsid, the new virions exit the cell by budding or lysing through cell membrane to further infect other cells.

The genome size of a negative RNA virus is between 10kb to 30kb. Two genome subgroups can be distinguished, nonsegmented and segmented, and are described as such:

Taxonomy

One order and eight families are currently recognised in this group. Four of these families contain extremely similar genetic structures and are classified under the order Mononegavirales.[5] A number of unassigned species and genera are yet to be classified.[6]

Host range

Viruses of the families Arenaviridae, Orthomyxoviridae, and Paramyxoviridae are able to infect vertebrates. Viruses of the families Bunyaviridae and Rhabdoviridae are able to infect vertebrates, arthropods, and plants. Viruses of the family Tenuivirus only infect plants. A few viruses known to infect humans include Marburg virus, Ebola, measles, mumps, rabies, and influenza.

Genome

The genome for negative-stranded RNA virus (NSV) consists of one to several single-stranded RNAs, which are assembled into complexes.[8] These complexes function as templates for the transcription and replication of the NSV genome by RNA polymerase. The NSV genome has been observed as being either segmented and nonsegmented.[8] The segmented genome can be divided up into anywhere between 2-8 RNA molecules.[8] A distinctive feature of the NSV genome is its highly structured organization. Multiple monomers of either the ribonucleoprotein complexes or nucleocapsids associate with the RNA in order to create these organized complexes.[8] Nonsegmented RNA follows a sequential pattern of gene expression.[8] With segmented RNA, each individual segment is contained in a distinct ribonucleoprotein complex.[8] These complexes function independently for transcription and replication related processes.[8]

NSV ribonucleoproteins (RNPs) generally adopt a helical conformation.[8] For nonsegmented NSVs, these conformations are typically linear in fashion, and are relatively rigid.[9][10] Segmented NSVs are present in a more flexible, circular conformation.[11] This results from non-covalent RNA-RNA interactions between the 5’- and 3’-termini of the RNA segments.[12] Regarding the helical character of NSV RNPs, the main determinant of this conformation is the NP/N protein.[8] The structure of virion full-length RNPs are typically presented as a left-handed, double-helical arrangement of two NP strands that are opposite in polarity.[8] Recombinant RNPs have a different structure, generally consisting of a right-handed helix.[13]

Catalytic activity related to RNA synthesis is associated with a very large protein, termed the L protein. This is a multi-enzymatic polypeptide that is responsible for multiple tasks. These activities span multiple domains, including mRNA synthesis/modification and the formation of ribonucleoproteins.[14][15] Through phylogenetic analysis, it was determined that NSV RNA polymerases share a common ancestor with other RNA polymerases from various origins.[8] This is further supported by various L proteins displaying highly conserved sequence blocks that are in series, yet separated by variable regions.[16]

When discussing the NSV RNP, the NP/N protein is considered to be the most abundant element of the ribonucleoprotein.[8] These elements are what provide the basis for the RNPs helical conformation.[8] NP/N proteins are also vital for the transcription and replication of full-length RNA templates.[8] The proper function of NP/N proteins rely on their capacity to oligomerize. This defines the ability of NP/N proteins to complex together to form larger structural elements. The oligomerization mechanism is unique between the nonsegmented NSV genome (nsNSV) and segmented NSV genome (sNSV).[8] For nsNSVs, interactions occur between the protein monomers, while the stabilization of this complex occurs through inter-monomeric contact involving N-terminal and/or C-terminal protein extensions.[10][17][18] This contributes to the viral RNP helical structure.[9][10][19] Oligomerization for sNSVs take place much more flexibly, defined by their ability to form much smaller oligomers.[8] These include, but are not limited to, dimers, trimers, tetramers, long helices, and more complex structures.[8]

NSV Life Cycle and Replication

Negative-strand RNA viruses (NSV) can be classified into 7 distinct families. The families consisting of nonsegmented genomes include Rhabdo-, Paramyxo-, Filo-, Borna-. Orthomyxo-, Bunya-, Arenaviridae- contain genomes which consist of six to eight, three or two negative-sense RNA segments, respectively.[20] Many highly prevalent human pathogens such as the respiratory syncytial virus (RSV), parainfluenza viruses, influenza viruses, Ebola virus, Marburg virus are included within the NSV. The life cycle of NSV has a number of steps. The virus first infects the host cell by binding to the a host cell receptor through a viral surface glycoprotein.[21] The fusion of the glycoprotein viral membrane with the plasma membrane of the host cell in an acidic environment allows for the release of viral ribonucleoprotein (RNP) complexes into the cytoplasm. Most NSV replicate in the cytoplasm of infected cells. Newly synthesized RNP complexes are assembled with viral structural proteins at the plasma membrane or at membranes of the Golgi apparatus.[20] This is all followed by the release of the newly synthesized viruses.

In regards to the replication and transcription of non-segmented NSV, the genes of these NSV are made up of three regulatory regions: a gene end signal, an intergenic region, and a gene start signal.[20][22] One example of gene end signals are in a specific virus called the vesicular stomatitis virus (VSV) contains gene end signals that are highly conservative. The intergenic region is highly variable and consists of conserved dinucleotide, trinucleotide, or regions of up to 143 nucleotides.[22] The various lengths of the intergenic regions correlate with transcriptional attenuation, however diverse intergenic regions do not alter the gene expression. The gene start signals are highly specific as the first three nucleotides are critical for the gene expression.[20][22][23]

Molecular Mechanisms of Innate Antiviral Immune Inhibition

A cell’s innate immune response is the first line of defense for finding viral infections. The innate immune response triggers the production of type I interferons (IFN) and pro-inflammatory cytokines.[24][25] However, non-segmented negative sense RNA viruses (NNSV) have developed multifunctional proteins which are capable of diffusing this innate response pathway in order to avoid antiviral functions within the cell.[25] This mainly occurs through the NNSV's proteins interacting with other cellular proteins which are involved in the type I interferon signaling pathway.[24] Due to the expansive nature of the immune pathway, NNSVs have a variety of areas throughout the signaling cascade which can be targeted for the interruption of the production of type I interferons or pro-inflammatory cytokines.[26] Such areas include inhibiting the induction of the IFN pathway or inhibiting the response from the IFN signaling cascade.

NNSV-Mediated Inhibition of IFN Inhibition

Several areas of the induction pathway, as outlined in the image provided, are targeted by NNSVs in order to avoid detection within the cell or even inhibit that specific area of the signaling cascade. One such example of NNSVs avoiding cellular detection arises with mutations which sequester the pathogen-associated molecular pathways.[24][27] By creating a mutation within the nucleotide sequence, specifically ones important for binding double stranded DNA or other proteins, the virus is able to go undetected by cell, avoid activation of the cellular antiviral response, and evade the immune response.

NNSVs can also bind to cellular receptors throughout the pro-inflammatory cytokine pathway in order to inhibit the immune response.[24] By carrying accessory proteins which directly bind to pattern recognition receptors, the virus is able to use its accessory proteins to induce conformational changes throughout other immune response proteins and inhibit cellular responses.[26] Generally, the pattern recognition receptors are responsible for detecting infection associated molecules commonly associated with viruses, but the accessory proteins that some viruses may carry reconfigure the protein in order to inhibit its function and block the rest of the signaling cascade which would originally produce an immune response.

Other areas of inhibition of induction apply similar concepts of binding to cellular proteins and inhibiting their function throughout the immune cascade.[24][25] These include binding to proteins involved in dephosphorylation pathways and blocking DNA binding transcription factors. In each case, the accessory proteins coded for in the nucleotide sequence inhibit a critical function of other innate cellular proteins, disrupting the signaling cascade for producing type I interferons and pro-inflammatory cytokines.

NNSV-Mediated Inhibition of IFN Response

Another way that NSVs avoid the immune response of the host is to encode for proteins which target the JAK/STAT pathway or the nuclear transports mechanisms for transcription factors. Each of these are a portion of the IFN pathway described previously in the immune system’s innate response to viral infection.

JAK/STAT pathway

For the JAK/STAT pathway depicted in the image, a critical reaction for inducing the pathway is the proper phosphorylation of the TYK2 and JAK1 proteins.[24] Upon phosphorylation, the rest of the STAT pathway will begin and lead to the production of antiviral genes.[28] NNSVs have the capability to synthesize proteins which target the phosphorylation step of the pathway. By preventing the phosphorylation of TYK2 and JAK1, they stop the IFNα/β pathway and bring the antiviral immune response to a halt.[29] Similarly, viruses can also synthesize proteins which will prevent the phosphorylation of STAT1 a little further along the signaling cascade. This process has the same result in halting the IFNα/β pathway, just like preventing phosphorylation of TYK2 and JAK1.

Further down the IFNα/β pathway, STAT1 and STAT2 are transported across the nuclear membrane, as depicted in the image.[24][29] They accordingly bind to the DNA sequence and behave as transcription factors- affecting the level of gene production throughout the cell. In normal cellular function, this pathway will behave normally in response to viral infection, leading to the production of antiviral genes and the induction of an immune response.[24] However, NNSVs have developed the capability to generate complexes which target the protein responsible for translocating STAT1 across the nuclear membrane. By binding to and inhibiting this function, STAT1 is never able to bind to the DNA and properly regulate the production of antiviral genes.[28][29] This pathway of inhibiting the IFN response helps the NNSV go undetected within the cell and avoid certain immune response pathways.

Ubiquitination

Another important process utilized throughout many cellular processes is ubiquitination- which is outlined in the image below. This is utilized in many cells in order to locate and identify viruses, as well as, restrict the viral infection throughout.[30] NNSVs however have developed a pathway to synthesize proteins which target the ubiquitin pathway along many of the signaling cascades descriptive of the IFN response. More specifically, the NNSVs are capable of reprogramming the host cell’s ubiquitination pathway in such a way that leads to the degradation of host cell mechanism that would otherwise silence a viral infection.[31]

Ubiquitination Pathway

Common Mechanism for RNA Encapsidation by NSVs

Like all viruses, negative-sense RNA viruses (NSVs) contain a protein capsid that encapsulates the genomic material. The nucleocapsid of NSVs is assembled with a single nucleocapsid protein, and the viral RNA. Each NSV nucleocapsid is packaged inside a lipid envelope, but the appearance of the nucleocapsid differs from virus to virus.[32] For example, in rhabdoviruses, the nucleocapsid assumes a bullet shape,[19] while in paramyxoviruses, the nucleocapsid is filamentous or herringbone-like.[33] However, when the nucleocapsids are released from the virion, they all appear like a coil.[32]

So far, the atomic structures of nucleocapsid-like-particles (NLP) have been elucidated for three NSV families: Rhabdoviridae, Paramyxoviridae, and Bunyaviridae. One important element of NSVs is that the capsid protein (N) is first synthesized as a monomeric protein (N0). N0 is a capsid protein that assembles a capsid to accommodate any RNA sequence. N0 is kept monomeric in different ways depending on which family of NSVs a virus falls into. For instance, rhabdoviruses keep the N0 monomeric by forming a complex with the phosphoprotein (P).[19] It has been found that both the N- and C terminal regions of P bind to the capsid protein. Essentially, the P binding occupies the site required for N0 oligomerization. Other viruses, such as bunyaviruses, simply sequester the N terminus by N itself. Nonetheless, it is essential for N to be monomeric in order for the NSV to be competent in encapsidating viral RNA.[19]

In terms of the structure of the nucleocapsid, the N protein will eventually oligomerize to encapsidate the single-strand RNA. The N subunits are oriented in a parallel orientation, and the ssRNA is sequestered in the center. In most NSVs, the nucleocapsid appears to be a random coil, and the symmetry is linear.[34] Because the N subunits are oriented in a parallel fashion, the cross-molecular interactions among the subunits stabilize the nucleocapsid and are critical for capsid formation. The linear interactions along the encapsidated single-stranded RNA are actually a unique feature to NSVs.[19]

Structure of a Nucleocaspid

The process of encapsidation is a concomitant process with viral replication, likely at the site of the viral RNA replication process.[35] Another unique feature of NSVs is that the sequestered bases are stacked to form a motif similar to half of the A-form double helix of RNA. The stacking arrangement allows for maximized packaging of the RNA in the capsid.[19] The base stacking may actually contribute to the overall stability of the nucleocapsid, and is dependent on the RNA sequence (i.e. poly(rA) is the most stable).[36] An interesting finding is that specific sequences in the sequestered RNA genome may regulate viral functions. For translational termination, there is a U7 track at the end of each coding region, causing this to be the least stable region. This therefore promotes dissociation of the transcription complex.[19] A unique aspect of NSVs is the conserved (3H+5H) motif, which has been identified to constitute the RNA cavity through secondary structure elements of the N protein.[37]

Lastly, a main distinction between NSVs from other viruses is that the nucleocapsid actually serves as the template for viral RNA synthesis. During synthesis, the nucleocapsid undergoes a conformational change to release the RNA template. After transcription is complete, the RNA is repositioned in the cavity, and the nucleocapsid is restored.[19]

See also

References

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