biology

PILRA

PILRA 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 PILRA rather than just read about it. In short: Paired immunoglobin like type 2 receptor alpha is a protein that in humans is encoded by the PILRA gene. Function Cell signaling pathways rely on a dynamic interaction between activating and inhibiting processes.

Key takeaways

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

Reference excerpt

Paired immunoglobin like type 2 receptor alpha is a protein that in humans is encoded by the PILRA gene.

Function Cell signaling pathways rely on a dynamic interaction between activating and inhibiting processes. SHP-1-mediated dephosphorylation of protein tyrosine residues is central to the regulation of several cell signaling pathways. Two types of inhibitory receptor superfamily members are immunoreceptor tyrosine-based inhibitory motif (ITIM)-bearing receptors and their non-ITIM-bearing, activating counterparts. Control of cell signaling via SHP-1 is thought to occur through a balance between PILRalpha-mediated inhibition and PILRbeta-mediated activation. These paired immunoglobulin-like receptor genes are located in a tandem head-to-tail orientation on chromosome 7. This particular gene encodes the ITIM-bearing member of the receptor pair, which functions in the inhibitory role. Alternative splicing has been observed at this locus, and three variants, each encoding a distinct isoform, are described. In contrast to PILRbeta, which has only one known natural ligand, PILRalpha has many known protein-protein interactions. PILRalpha recruits PTPN6 and PTPN1 via interactions of its ITIM motifs. PILRalpha is also used by some viruses, notably HSV-1, for cell entry.

Structure As with other paired receptors, PILRalpha has a longer cytoplasmic tail compared to PILRbeta and features two intracellular ITIM motifs. PILRalpha has an extracellular domain with a siglec-like immunoglobulin fold that substitutes hydrophobic interactions for the siglec fold's characteristic disulfide bond. The structure of this domain is very similar to that of PILRbeta, but the two proteins nevertheless have different binding affinities for sialic acid.

References

Illustrations

Worked examples

Example 1 — a first encounter with PILRA

Start with the simplest possible case. Write down what PILRA 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 PILRA 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 PILRA 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 PILRA

In research: PILRA 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 PILRA 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: PILRA is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 7, Human chromosome 7 gene stubs, so understanding it makes those chapters shorter.
In everyday life: Look for PILRA 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 PILRA in 20 minutes

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

Frequently asked questions

What is PILRA in simple terms?

Paired immunoglobin like type 2 receptor alpha is a protein that in humans is encoded by the PILRA gene. Function Cell signaling pathways rely on a dynamic interaction between activating and inhibiting processes.

Why does PILRA 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 PILRA?

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 PILRA.