biology

TNF receptor superfamily

TNF receptor superfamily 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 TNF receptor superfamily rather than just read about it. In short: The tumor necrosis factor receptor superfamily (TNFRSF) is a protein superfamily of cytokine receptors characterized by the ability to bind tumor necrosis factors (TNFs) via an extracellular cysteine-rich domain. With the exception of nerve growth factor (NGF), all TNFs are homologous to the archetypal TNF-alpha.

Key takeaways

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

Reference excerpt

The tumor necrosis factor receptor superfamily (TNFRSF) is a protein superfamily of cytokine receptors characterized by the ability to bind tumor necrosis factors (TNFs) via an extracellular cysteine-rich domain. With the exception of nerve growth factor (NGF), all TNFs are homologous to the archetypal TNF-alpha. In their active form, the majority of TNF receptors form trimeric complexes in the plasma membrane. Accordingly, most TNF receptors contain transmembrane domains (TMDs), although some can be cleaved into soluble forms (e.g. TNFR1), and some lack a TMD entirely (e.g. DcR3). In addition, most TNF receptors require specific adaptor protein such as TRADD, TRAF, RIP and FADD for downstream signalling. TNF receptors are primarily involved in apoptosis and inflammation, but they can also take part in other signal transduction pathways, such as proliferation, survival, and differentiation. TNF receptors are expressed in a wide variety of tissues in mammals, especially in leukocytes. The term death receptor refers to those members of the TNF receptor superfamily that contain a death domain, such as TNFR1, Fas receptor, DR4 and DR5. They were named after the fact that they seemed to play an important role in apoptosis (programmed cell death), although they are now known to play other roles as well. In the strict sense, the term TNF receptor is often used to refer to the archetypal members of the superfamily, namely TNFR1 and TNFR2, which recognize TNF-alpha.

Members In humans, there are 29 known family members of the TNF receptor superfamily. Historically, the family members have been numerically classified as TNFRSF#, where # denotes the member number, sometimes followed a letter. Some newer additions to the TNF family remain unnumbered, however, such as the TNF receptor superfamily member EDAR.

References

Further reading Kavurma MM, Tan NY, Bennett MR (2008). "Death receptors and their ligands in atherosclerosis". Arterioscler Thromb Vasc Biol. 28 (10): 1694–702. doi:10.1161/ATVBAHA.107.155143. PMID 18669890. Hatano, E. (2007). "Tumor necrosis factor signaling in hepatocyte apoptosis". J Gastroenterol Hepatol. 22: S43–44. doi:10.1111/j.1440-1746.2006.04645.x. PMID 17567463.

External links Tumor+Necrosis+Factor+Receptor at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

Illustrations

Worked examples

Example 1 — a first encounter with TNF receptor superfamily

Start with the simplest possible case. Write down what TNF receptor superfamily 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 TNF receptor superfamily 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 TNF receptor superfamily 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 TNF receptor superfamily

In research: TNF receptor superfamily 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 TNF receptor superfamily 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: TNF receptor superfamily is common in secondary-school and first-year university syllabi. It links to neighbouring topics Apoptosis, Protein superfamilies, Single-pass transmembrane proteins, so understanding it makes those chapters shorter.
In everyday life: Look for TNF receptor superfamily 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 TNF receptor superfamily in 20 minutes

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

Frequently asked questions

What is TNF receptor superfamily in simple terms?

Why does TNF receptor superfamily 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 TNF receptor superfamily?

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 TNF receptor superfamily.