science

Lipothrixviridae

Lipothrixviridae 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 Lipothrixviridae rather than just read about it. In short: Lipothrixviridae is a family of viruses in the order Ligamenvirales. Thermophilic archaea in the phylum Thermoproteota serve as natural hosts.

Key takeaways

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

Reference excerpt

Lipothrixviridae is a family of viruses in the order Ligamenvirales. Thermophilic archaea in the phylum Thermoproteota serve as natural hosts.

Taxonomy The following genera and species are assigned to the family:

Alphalipothrixvirus Betalipothrixvirus Deltalipothrixvirus The family consists of three genera: Alphalipothrixvirus, Betalipothrixvirus, and Deltalipothrixvirus. Captovirus used to be in this family as the genus Gammalipothrixvirus, but now it is the only genus in the family Ungulaviridae. They are classified into genera based on their genomic properties and on the diversity of their terminal appendages, which are involved in host cell recognition. The originally proposed genus Alphalipothrixvirus was renamed Alphatristromavirus and moved to family Tristromaviridae. In 2020, the genus Alphalipothrixvirus was recreated for classification of Sulfolobus filamentous virus 1 and Sulfolobales Beppu filamentous virus 2. In the genus Gammalipothrixvirus claw-like structures are found at either end of the virion. Members of the Lipothrixviridae share structural and genomic characteristics with viruses from the Rudiviridae family, which contains non-enveloped rod-shaped viruses. Viruses from the two families have linear dsDNA genomes and share up to nine genes. In addition, the filamentous particles of rudiviruses and lipothrixviruses are built from structurally similar, homologous major capsid proteins. Due to these shared properties viruses from the two families are classified into an order Ligamenvirales. Members of the Ligamenvirales are structurally related to viruses of the family Tristromaviridae which, similar to lipothrixviruses, are enveloped and encode two paralogous major capsid proteins with the same fold as those of ligamenviruses. Due to these structural similarities, order Ligamenvirales and family Tristromaviridae were proposed to be unified within a class 'Tokiviricetes' (toki means ‘thread’ in Georgian and viricetes is an official suffix for a virus class).

Virology The viruses are enveloped and filamentous. The capsid varies considerably in length – 410–1950 nanometers (nm) – and is 24–38 nm in diameter. The envelope has a bilayer structure and includes di-phytanyl tetraethers lipids. The capsid is elongated with a helical nucleocapsid core. At the ends of the virion are claw-like protrusions. There are two major capsid proteins (MCP1 and MCP2). MCP1 and MCP2 form a heterodimer, which wraps around the linear dsDNA genome transforming it into A-form. Interaction between the genome and the MCPs leads to condensation of the genome into the virion superhelix. Genomes are linear, up to 40 kb in length.

Life cycle Viral replication is cytoplasmic. Entry into the host cell is achieved by adsorption to the host cell. Acidianus filamentous virus 1 was found to bind to cellular pili-like appendages. DNA templated transcription is the method of transcription. Archaea serve as the natural host. Transmission routes are passive diffusion. Virion assembly and egress have been studied in the case of Sulfolobus islandicus filamentous virus (SIFV). The virions assemble inside the cell. Binding of the major capsid protein dimers to the linear dsDNA genome lead to the assembly of nucleocapsids, which are subsequently enveloped intracellularly through an unknown mechanism. All lipothrixviruses are likely to be lytic viruses. In the case of betalipothrixviruses and deltalipothrixviruses, virions are released through pyramidal portals, referred to as virus-associated pyramids (VAPs). The VAPs of SIFV have a hexagonal base (i.e., constructed from six triangular facets).

References

External links Media related to Lipothrixviridae at Wikimedia Commons Viralzone: Lipothrixviridae

Illustrations

Worked examples

Example 1 — a first encounter with Lipothrixviridae

Start with the simplest possible case. Write down what Lipothrixviridae 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 Lipothrixviridae 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 Lipothrixviridae 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 Lipothrixviridae

In research: Lipothrixviridae 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 Lipothrixviridae 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: Lipothrixviridae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Lipothrixviridae, Virus families, so understanding it makes those chapters shorter.
In everyday life: Look for Lipothrixviridae 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 Lipothrixviridae in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lipothrixviridae 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 Lipothrixviridae out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lipothrixviridae in simple terms?

Lipothrixviridae is a family of viruses in the order Ligamenvirales. Thermophilic archaea in the phylum Thermoproteota serve as natural hosts.

Why does Lipothrixviridae 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 Lipothrixviridae?

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 Lipothrixviridae.