biology

M2 hol family

M2 hol 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 M2 hol family rather than just read about it. In short: The Mycobacterial 2 TMS Phage Holin (M2 Hol) Family (TC# 1.E.36) is a group of transporters belonging to the Holin Superfamily VII. The Mycobactrerial 2 transmembrane segment (TMS) Holins have been identified and recognized by Catalao et al (2012).

Key takeaways

M2 hol 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 M2 hol family to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of M2 hol family from memory before moving on to harder problems.

Reference excerpt

The Mycobacterial 2 TMS Phage Holin (M2 Hol) Family (TC# 1.E.36) is a group of transporters belonging to the Holin Superfamily VII. The Mycobactrerial 2 transmembrane segment (TMS) Holins have been identified and recognized by Catalao et al (2012). The Mycobacterium phage D29 gp11 protein (TC# 1.E.36.1.7) is a holin that, upon expression, rapidly kills both E. coli and Mycobacterium smegmatis. Shortening gp11 from its C-terminus resulted in diminished cytotoxicity and smaller holes. The two TMSs at the N-terminus alone do not integrate into the cytoplasmic membrane and do not show toxicity. Fusion of the two TMSs and a small C-terminal coiled-coil region resulted in restoration of cell killing. The second TMS is dispensable for toxicity. The gp11 C-terminal region is therefore necessary but not sufficient for toxicity.

See also Holin Lysin Transporter Classification Database

Further reading Delisle, Allan L.; Barcak, Gerard J.; Guo, Ming (2006). "Isolation and expression of the lysis genes of Actinomyces naeslundii phage Av-1". Applied and Environmental Microbiology. 72 (2): 1110–1117. Bibcode:2006ApEnM..72.1110D. doi:10.1128/AEM.72.2.1110-1117.2006. PMC 1392916. PMID 16461656. Lella, Muralikrishna; Mahalakshmi, Radhakrishnan (2013). "Pro-Gly mediated conformational switch of mycobacteriophage D29 holin transmembrane domain I is lipid concentration driven". Chemical Communications. 49 (83): 9594–9596. doi:10.1039/c3cc45058a. PMID 24018990.

References

As of this edit, this article uses content from "1.E.36. The Mycobacterial 2 TMS Phage Holin (M2 Hol) 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 M2 hol family

Start with the simplest possible case. Write down what M2 hol 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 M2 hol 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 M2 hol 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 M2 hol family

In research: M2 hol 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 M2 hol 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: M2 hol family is common in secondary-school and first-year university syllabi. It links to neighbouring topics Holins, Protein families, so understanding it makes those chapters shorter.
In everyday life: Look for M2 hol 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 M2 hol family in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what M2 hol 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 M2 hol family out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is M2 hol family in simple terms?

Why does M2 hol 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 M2 hol 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 M2 hol family.