Diagram the conversion of a retrovirus RNA to a provirus. Show how this explains the difference

Diagram the conversion of a retrovirus RNA to a provirus....

Key Concepts

Integration Mechanism

Integration refers to the process by which the viral DNA, produced by reverse transcription, is incorporated into the host cell's genome. This mechanism is mediated by specific viral enzymes and is critical for establishing a long-term infection, as it enables the host's transcriptional machinery to produce viral components over time.

Provirus Formation

A provirus is the integrated form of viral DNA within the host's genome. After reverse transcription, the newly synthesized DNA is inserted into the host cell's DNA through the action of the integrase enzyme. This integration allows the virus to persist in the host cell, often altering how the virus replicates compared to viruses that do not integrate.

Retroviral Replication Cycle

This concept encompasses the overall process by which retroviruses infect host cells, replicate their genome, and eventually produce new viral particles. A key aspect of this cycle is the conversion of the viral RNA genome into DNA, which is then integrated into the host genome, distinguishing retroviruses from other types of viruses.

Reverse Transcription

Reverse transcription is the process in which the enzyme reverse transcriptase converts the single-stranded RNA genome of a retrovirus into double-stranded DNA. This step is essential because it allows the viral genetic material to be used with the host cell's replication machinery, leading to the formation of a provirus.

Transcript

00:03 Let's walk through the replicative cycle of a virus with a single -stranded genome that can function as mrna.

00:13 All right, so first let's draw our host cell and our virus.

00:24 So here is our virus.

00:34 And that right there is the envelope with the glycoproteins.

00:39 Inside is the capsid and here is the rna.

00:48 So red is rna.

00:50 So first, the glycoproteins on the viral envelope bind to specific receptor molecules on the host cell.

01:00 And that promotes viral entry into the cell.

01:04 The capsid and viral genome enter the cell.

01:10 Keep it green.

01:11 Just keep things simple.

01:14 There we go.

01:15 Digestion of the capsid by cellular enzymes releases the viral genome.

01:20 So there it is.

01:23 Now, this is going to be different.

01:25 So the next step naturally would be the viral genome functions as a template for synthesis of complementary rna strands.

01:34 That is still going to happen, but over here.

01:41 So for the single stranded genome, it is going to be.

01:50 Translated the viral genome is going to be translated into capsid proteins and envelope glycoproteins directly instead of being after the complementary rna copy b is made.

02:04 So the rna strand would still be made over here and it's still going to be used as a template for many new copies of the viral genome, but the other steps instead of happening after that are going to happen directly.

02:17 So here are our capsid proteins and here is the glucoprotein.

02:35 There we go.

02:38 All right.

02:40 So the rna is going to be translated into, well, the capsid proteins are have been made directly and vesicles are going to transport envelope glycoproteins to the plasma membrane.

02:56 So here is that little vesicle...

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