biology

Putative holin-2 family

Putative holin-2 family is a biology 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 Putative holin-2 family rather than just read about it. In short: The Putative Holin-2 (PH-2) Family (TC# 9.B.154) is a large family with members from a wide variety of bacteria (i.e., Roseifoexus, Cupriavidus (Ralstonia), Opitutus, Bacteroides, Pirellula). As of early 2016, functional data is not available for members of the PH-2 family, but based on their size and topology, it is believed they act as holins to facilitate cell lysis.

Key takeaways

Putative holin-2 family belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Putative holin-2 family to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Putative holin-2 family from memory before moving on to harder problems.

Reference excerpt

The Putative Holin-2 (PH-2) Family (TC# 9.B.154) is a large family with members from a wide variety of bacteria (i.e., Roseifoexus, Cupriavidus (Ralstonia), Opitutus, Bacteroides, Pirellula). As of early 2016, functional data is not available for members of the PH-2 family, but based on their size and topology, it is believed they act as holins to facilitate cell lysis. PH-2 family proteins are of 130 to 210 amino acyl residues (aas) in length and may exhibit 1 or 2 transmembrane segments (TMSs). A representative list of proteins belonging to the PH-2 family can be found in the Transporter Classification Database.

See also Holin Lysin Transporter Classification Database

Further reading Wang, I. N.; Smith, D. L.; Young, R. (2000-01-01). "Holins: the protein clocks of bacteriophage infections". Annual Review of Microbiology 54: 799–825.doi:10.1146/annurev.micro.54.1.799. ISSN 0066-4227.PMID 11018145.

References

As of this edit, this article uses content from "9.B.154 The Putative Holin-2 (PH-2) Family", which is licensed in a way that permits reuse under the Creative Commons Attribution-ShareAlike 3.0 Unported License, but not under the GFDL. All relevant terms must be followed.

Worked examples

Example 1 — a first encounter with Putative holin-2 family

Start with the simplest possible case. Write down what Putative holin-2 family claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Putative holin-2 family 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 Putative holin-2 family 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 Putative holin-2 family

In research: Putative holin-2 family appears in biology 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 Putative holin-2 family 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: Putative holin-2 family is common in secondary-school and first-year university syllabi. It links to neighbouring topics Holins, Integral membrane proteins, Membrane proteins, so understanding it makes those chapters shorter.
In everyday life: Look for Putative holin-2 family 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 Putative holin-2 family in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Putative holin-2 family 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 Putative holin-2 family out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Putative holin-2 family in simple terms?

Why does Putative holin-2 family matter?

Because it connects several biology 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 Putative holin-2 family?

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 Putative holin-2 family.