science

Podoviridae

Podoviridae is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Podoviridae rather than just read about it. In short: Podoviridae was a family of bacteriophage in the order Caudovirales often associated with T-7 like phages. The family and order Caudovirales have now been abolished, with the term podovirus now used to refer to the morphology of viruses in this former family.

Key takeaways

Podoviridae belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Podoviridae to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Podoviridae from memory before moving on to harder problems.

Reference excerpt

Podoviridae was a family of bacteriophage in the order Caudovirales often associated with T-7 like phages. The family and order Caudovirales have now been abolished, with the term podovirus now used to refer to the morphology of viruses in this former family. There were 130 species in this family, assigned to 3 subfamilies and 52 genera. This family was characterized by having very short, noncontractile tails. Many former phages in the former family Podoviriade are now classified in the Autographiviridae

Structure

Viruses in the former family Podoviridae are non-enveloped, with icosahedral and head-tail geometries. The diameter is around 60 nm, and consists of 72 capsomers. The head protein has a molecular mass of ~38 kilodaltons and is present in 460 copies per virion. There are 9 structural proteins. The tail is non-contractile and has 6 short subterminal fibers. It is thick and rod-shaped and built of stacked disks. The maximum length is ~17 nm. The double stranded DNA genome is linear, around 40-42kb in length, and encodes ~55 genes. The guanine + cytosine content is ~50%. It has terminally redundant sequences and is nonpermuted. By weight, the genome constitutes ~50% of the viron. The genome encodes 9 structural proteins, an adenylated transferase B type DNA polymerase and an RNA polymerase. Three internal proteins constitute the polymerase complex. Two classes of genes are recognized (early and late). This classification is based on the timing of transcription that is temporally regulated. Genes with related functions are clustered together. Genome replication is bidirectional.

Life cycle Viral replication is cytoplasmic. Entry into the host cell is achieved by adsorption into the host cell. Replication follows the DNA strand displacement model. DNA-templated transcription is the method of transcription. The virus exits the host cell by lysis, and holin/endolysin/spanin proteins. Bacteria serve as the natural host. Transmission routes are passive diffusion. Phage infection is considered self-dosing thus self-limiting. After host lysis, new phages trigger a new infection cycle with surrounding bioavailable host species resulting in growth and expansion.

Taxonomy Genera within this family have ~40% identity between corresponding proteins. Subfamilies have ~20% identity between corresponding proteins. The following subfamilies and their genera are recognized (-virinae denotes subfamily and -virus denotes genus):

Beephvirinae Flowerpowervirus Immanueltrevirus Manuelvirus Eekayvirinae Akonivirus Tinytimothyvirus Sepvirinae Diegovirus Oslovirus Traversvirus The following genera are not assigned to a subfamily:

Lastly, the species Pseudomonas virus 119X is unassigned to a genus or subfamily.

References

External links

Viralzone: Podoviridae ICTV Complete Genomes of Podoviridae

Illustrations

Worked examples

Example 1 — a first encounter with Podoviridae

Start with the simplest possible case. Write down what Podoviridae claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Podoviridae before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Podoviridae ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Podoviridae

In research: Podoviridae appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Podoviridae in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Podoviridae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Podoviridae, Virus families, so understanding it makes those chapters shorter.
In everyday life: Look for Podoviridae outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Podoviridae in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Podoviridae means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Podoviridae out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Podoviridae in simple terms?

Why does Podoviridae matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Podoviridae?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Podoviridae.