science

Type II cytokine receptor

Type II cytokine receptor 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 Type II cytokine receptor rather than just read about it. In short: Type II cytokine receptors, also commonly known as class II cytokine receptors, are transmembrane proteins that are expressed on the surface of certain cells. They bind and respond to the class II cytokines, which includes all types of interferons and members of the interleukin-10 family These receptors are characterized by the lack of a WSXWS motif which differentiates them from type I cytokine receptors.

Key takeaways

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

Reference excerpt

Type II cytokine receptors, also commonly known as class II cytokine receptors, are transmembrane proteins that are expressed on the surface of certain cells. They bind and respond to the class II cytokines, which includes all types of interferons and members of the interleukin-10 family These receptors are characterized by the lack of a WSXWS motif which differentiates them from type I cytokine receptors. In the context of fish and animals further removed from humans, the family is also called cytokine receptor family B (CRFB).

Structure Type II cytokine receptors are related predominantly by sequence similarities in their extracellular portions that are composed of tandem Ig-like (FN3) domains. The structures for the extracellular domains of the receptors for interferon types, I, II, and III are all known. Type II cytokine receptors are tyrosine-kinase-linked receptors. The intracellular domain of type II cytokine receptors is typically associated with a tyrosine kinase belonging to the Janus kinase (JAK family). Binding of the receptor typically leads to activation of the canonical JAK/STAT signaling pathway. Like other cytokine receptors, many type II CRs are heterodimers or multimers with a high and a low affinity component. The high-affinity component is cytokine‐specific and, again like other CRs, is often the α chain. The low-affinity component remains required for forming a functional complex: in some examples such as IFN III, the ligand first binds to the α chain, then the two molecules together recruits a "shared" β chain. Typical CRFBs have an alpha chain and a beta chain. Each chain contains two (except for IFNAR1) N-terminal extracellular ligand-binding fibronectin type III domains (FN3; each pair is called a cytokine homology region, CHR), then extends intracellularly. Unlike class I CRs, all chains (even alpha) bind a kinase to participate in signaling. The shorter one (<100 intracellular residues, usually α) typically binds either JAK2 or TYK2, and the longer one typically interacts with JAK1. Interaction with JAK1 is mediated by a conserved motif PxxLxF (box1). There is a neighboring box2 that by itself poorly binds JAK1, but improves the binding between box1 and JAK1 in vitro. C-terminal to the two kinase boxes, mainly on the "long" chain, is a disordered region that binds STAT. TYK2 binding is greatly dependent on box2. There are many variations on the theme among the type II receptors, including a high-affinity β chain, some non-shared chains, and doubled stoichiometry where the complex is a heterotetramer assembled on binding a heterodimer cytokine (IFN II and IL-10 family members).

Types Type II cytokine receptors include those that bind interferons and those that bind members of the interleukin-10 family (interleukin-10, interleukin-20, interleukin-22, and interleukin-28). Expression of specific receptor varieties is highly variable across tissue types with some receptors being ubiquitously expressed and some receptors only expressed in specific tissues.

Interferon receptors The interferon receptor is a molecule displayed on the surface of cells which interacts with extracellular interferons. Class II cytokine receptors bind type I, type II, and type III interferons. Type I interferons play important roles in both the adaptive and innate immune responses, prevent proliferation of pathogens, and have antiviral activities. Type II interferons help to modulate the immune system's response to pathogens, and these interferons also respond to pathogens. Type III interferons induce a similar response to type I interferons, but their expression is limited to epithelial cells. The receptor is coded for by number of different genes, due to the diversity of types of interferons. Regulation of cell surface receptor levels plays an important role in the regulation and limiting of interferon signaling.

interferon-alpha/beta receptor interferon-gamma receptor Interferon type III receptor

Interleukin receptors Interleukin-10 receptor Interleukin-20 receptor Interleukin-22 receptor Interleukin-26 receptor

References

Worked examples

Example 1 — a first encounter with Type II cytokine receptor

Start with the simplest possible case. Write down what Type II cytokine receptor 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 Type II cytokine receptor 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 Type II cytokine receptor 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 Type II cytokine receptor

In research: Type II cytokine receptor 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 Type II cytokine receptor 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: Type II cytokine receptor is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cytokine receptors, Immunology stubs, Type II cytokine receptors, so understanding it makes those chapters shorter.
In everyday life: Look for Type II cytokine receptor 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 Type II cytokine receptor in 20 minutes

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

Frequently asked questions

What is Type II cytokine receptor in simple terms?

Why does Type II cytokine receptor 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 Type II cytokine receptor?

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 Type II cytokine receptor.