28 Mar In my project we have to design a new virus so for that we combine two viruses so we choose outer layer of virus from enterovirus and inner layer is from Adenovirus. So her
In my project we have to design a new virus so for that we combine two viruses so we choose outer layer of virus from enterovirus and inner layer is from Adenovirus. So here is the pdf of these two question now you just need to add main stuff from this pdf into power point slides.
1. Charecteristics of virions
2. Virus lifecycle and interaction with host cell
Virion Description
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Q1: Virion Characteristics
A virion is a complete virion particle. The virion's primary function is to deliver its DNA or RNA genome into the host cell, where it can be expressed (transcribed and translated) by the host cell. The viral genome is packaged inside a symmetric protein capsid, often with associated basic proteins. Accordingly, there are significant difference between virion and viriones, creating an effective platform to understand microbiology and life cycle of a virion and virion. Viriones are made up of nucleoproteins (Friedman, 2022). They are noncellular structures that contain infectious genetic material. Virions are viriones that are encapsulated in a capsid and contain DNA or RNA molecules. It contains both nucleic acid and protein layers. The virion, or complete infectious virion particle, consists of a genome made up of one or a few molecules of either DNA or RNA surrounded by a morphologically defined protein coat called the capsid; the capsid and the enclosed nucleic acid form the nucleocapsid. In simpler viriones, the virion is made up of a single molecule of nucleic acid surrounded by a protein coat called the capsid; the capsid and its encased nucleic acid form the nucleocapsid. Fundamentally, virion describe a complete viriones free form the host displaying fundamental characteristics including Genome or Nucleic acid, Capsid, Envelope and Enzymes that require practical articulation to explain features of virion.
The virion contains Genome or Nucleic acid contains the genome or nucleic acid, which contains DNA or RNA. A virion that contains the DNA protein is known as a DNA virion, and one that contains RNA is known as an RNA virion. Reovirion, for example, is an RNA virion with an RNA genome, whereas Papovavirion is a DNA virion. It is the protein coat that protects the cell. It is made up of many capsomeres that are tightly packed together in repeating patterns. It's like a hard shell. Its primary function during infection is to aid in the introduction of a viral genome into the host cell. The structure of a capsid is what gives the virion its symmetry. Cubical, helical, complex, or binal structures are possible. Some even have an envelope that surrounds the nucleocapsid. It is a layer of lipoprotein and glycoprotein, and the envelope is the result of the host cell's budding process (Friedman, 2022). Telomeres can also be formed by proteins such as neuraminidase and haemagglutinin, which are involved in virion binding to host cells. Virion enzyme characteristics define a crucial in the infection process. Some viruses, such as bacteriophages, contain enzymes such as lysozyme, which create a small hole in the bacterial cell and allow nucleic acid to enter.
In conclusion, a virion is a complete virion particle. The virion's primary function is to deliver its DNA or RNA genome into the host cell, where it can be expressed (transcribed and translated) by the host cell. The viral genome is packaged inside a symmetric protein capsid, often with associated basic proteins. Accordingly, there are significant difference between virion and viriones, creating an effective platform to understand microbiology and life cycle of a virion and virion. Viriones are made up of nucleoproteins. Fundamentally, virion provides effective As a result, viruses are infectious particles that are very small and can only be seen with electron microscopy. Every virus particle is classified according to the type of nucleic acid it contains—DNA or RNA—as well as whether it has single-stranded or double-stranded DNA and RNA structures.
Q2: life cycle and interaction between host cells
Attachment, entry, uncoating, replication, maturation, and release are the major stages of the viral life cycle. The viral attachment to the host cell, accommodate viral genome must be transferred from a virus particle into the cytoplasm of a host cell before a virus can infect it. This process starts when proteins on a virus's outer layer bind to attachment factors on the host cell surface. These attachment factors concentrate virus particles on the cell surface, bringing them closer to virus receptors that allow the virus to enter the host cell.
Viral infection: Viruses enter eukaryotic cells via two main pathways once bound to cell surface receptors. Some viruses enter cells by directly fusing with or penetrating the cell membrane, but the majority of viruses enter cells via endocytosis (coronaviruses can enter both ways). Viruses that require a higher acidic pH will not fuse until they reach the lysosome .These endocytic and lysosomal vesicles have a low pH and abundant proteases, which can cause a virus's conformation to change, resulting in uncoating, fusion, or penetration into the cytoplasm. Even viruses that do not require a low pH use endocytosis to quickly cross the plasma membrane and transit through the cytoplasm to their replication sites.
Replication of viruses
Once inside a cell, a virus begins the process of uncoating and replication. Viruses, as intracellular obligate pathogens, must control cellular proteins and organelles in order to replicate. Replication centers organize the cellular components required for viral gene expression and replication [2]. Some viruses replicate in the cytosol, while others, such as herpesviruses, adenoviruses, and influenza viruses, must travel to the nucleus.
The maturation and release of viruses
The final steps of virus replication occur after the nucleic acid genome and other essential proteins are packaged within the capsid, which is assembled from one or more translated viral proteins. These steps are maturation and release. Maturation is the process by which an immature virion undergoes the final changes that result in an infectious virus particle. Capsid structural changes are frequently involved, and these can be mediated by either host enzymes or virus-encoded enzymes. Following this maturation stage, the virus is released from a host cell via budding or lysis.
References
Friedman, R.(2022). A Hierarchy of Interactions between Pathogenic Virus and Vertebrate Host. Symmetry 2022, 14, 2274. https://doi.org/ 10.3390/sym14112274
Jones, J.E., Le Sage, V. & Lakdawala, S.S. (2021). Viral and host heterogeneity and their effects on the viral life cycle. Nat Rev Microbiol 19, 272–282 (2021). https://doi.org/10.1038/s41579-020-00449-9
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