Bacteriophage assembly
Lytic Cycle
A lytic infection is a virus that enters a cell, makes copies of itself and causes the cell to burst infecting other cells.
1.Attachment- Bacteriophage attaches itself to the host cell
2.Entry- Bacteriophage has gained entry into the host cell where it injects its viral DNA/mRNA into the host cell
3.Replication- Replication of viral nucleic acid has started. Takes over the outer cell metabolism synthesis or viral proteins & nucleic acids. A New Prophage DNA is created
4.Assembly- Prophage proteins are inserted into host cell. Capsids form around bacteriophage head and tail fibers join the process
5.Lysis- Host Cell starts to break out and reales viruses infecting other cells
A lytic infection is a virus that enters a cell, makes copies of itself and causes the cell to burst infecting other cells.
1.Attachment- Bacteriophage attaches itself to the host cell
2.Entry- Bacteriophage has gained entry into the host cell where it injects its viral DNA/mRNA into the host cell
3.Replication- Replication of viral nucleic acid has started. Takes over the outer cell metabolism synthesis or viral proteins & nucleic acids. A New Prophage DNA is created
4.Assembly- Prophage proteins are inserted into host cell. Capsids form around bacteriophage head and tail fibers join the process
5.Lysis- Host Cell starts to break out and reales viruses infecting other cells
Lysogenic Cycle
Unlike lytic viruses, lysogenic viruses remain inactive for a period of time. The Lysogenic is the first part of viral reproduction.
1.Attachment- The Bacteriophage attaches to the host cell membrane
2.Infection- Bacteriophage infects the host cells genome
3.Intergation- Viral DNA integrates into the Host Cell and DNA replicates the virus's chromosome
4.Cell Multiplication- Host Cell divides, the virus chromosomes are transferred to the host cells daughter cells
5.Entering Bacterial Chromosome- Once the daughter cells are created any movement can trigger the virus and the viral genome detaches from host cell's DNA and enters the Lytic Cycle.
Unlike lytic viruses, lysogenic viruses remain inactive for a period of time. The Lysogenic is the first part of viral reproduction.
1.Attachment- The Bacteriophage attaches to the host cell membrane
2.Infection- Bacteriophage infects the host cells genome
3.Intergation- Viral DNA integrates into the Host Cell and DNA replicates the virus's chromosome
4.Cell Multiplication- Host Cell divides, the virus chromosomes are transferred to the host cells daughter cells
5.Entering Bacterial Chromosome- Once the daughter cells are created any movement can trigger the virus and the viral genome detaches from host cell's DNA and enters the Lytic Cycle.
The lytic cycle of a viral or phage infection results in the complete reproduction of viral particles within the cell, including their exit from the cell. In many cases the virus cell is still intact to the host cell. In contrast, some viruses can persist as dormant in the host via the lysogenic cycle. In this case, the viral genome is inserted into host chromosomal DNA and replicates with host cells until an environmental change stimulates a physiological response in the cell and triggers the change from lysogenic to lytic cycle, leading to production of viral particles. An example in humans is Herpes simplex virus (cold sores). However, the virus is dormant in nerve cells and is activated often when the immune system is weakened, then giving the symptoms - cold sores.