biology

TcdE holin family

TcdE holin 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 TcdE holin family rather than just read about it. In short: The Clostridioides difficile TcdE Holin (TcdE Holin) Family (TC# 1.E.19) is a group of transporters belonging to the Holin Superfamily IV. A representative list of its members can be found in the Transporter Classification Database.

Key takeaways

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

Reference excerpt

The Clostridioides difficile TcdE Holin (TcdE Holin) Family (TC# 1.E.19) is a group of transporters belonging to the Holin Superfamily IV. A representative list of its members can be found in the Transporter Classification Database. Toxigenic strains of C. difficile produce two large toxins (TcdA and TcdB) encoded within a pathogenicity locus. tcdE, encoded between tcdA and tcdB, encodes a 166 amino acyl (aa) protein which causes death to E. coli when expressed, and the structure of TcdE resembles holins. TcdE acts on the bacterial membrane. Since TcdA and TcdB lack signal peptides, they may be released via TcdE either prior to or subsequent to cell lysis. Other Clostridial species bear homologues of TcdE.

The transport reaction believed to be catalyzed by TcdE is:Toxin (in) → Toxin (out)

See also Holin Lysin Clostridioides difficile toxin A Clostridioides difficile toxin B Transporter Classification Database

Further reading Dingle, Kate E.; Elliott, Briony; Robinson, Esther; Griffiths, David; Eyre, David W.; Stoesser, Nicole; Vaughan, Alison; Golubchik, Tanya; Fawley, Warren N. (2014-01-01). "Evolutionary history of the Clostridium difficile pathogenicity locus". Genome Biology and Evolution 6 (1): 36–52. doi:10.1093/gbe/evt204.ISSN 1759-6653. PMC 3914685. PMID 24336451. Dingle, Kate E.; Griffiths, David; Didelot, Xavier; Evans, Jessica; Vaughan, Alison; Kachrimanidou, Melina; Stoesser, Nicole; Jolley, Keith A.; Golubchik, Tanya. "Clinical Clostridium difficile: Clonality and Pathogenicity Locus Diversity". PLoS ONE 6 (5).doi:10.1371/journal.pone.0019993. PMC 3098275.PMID 21625511.

References

As of this edit, this article uses content from "1.E.19 The Clostridium difficile TcdE Holin (TcdE Holin) 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 TcdE holin family

Start with the simplest possible case. Write down what TcdE holin 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 TcdE holin 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 TcdE holin 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 TcdE holin family

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

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

Frequently asked questions

What is TcdE holin family in simple terms?

Why does TcdE holin 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 TcdE holin 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 TcdE holin family.