physics

Nuclear receptor coactivator 3

Nuclear receptor coactivator 3 is a physics 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 Nuclear receptor coactivator 3 rather than just read about it. In short: The nuclear receptor coactivator 3 also known as NCOA3 is a protein that, in humans, is encoded by the NCOA3 gene. NCOA3 is also frequently called 'amplified in breast 1' (AIB1), steroid receptor coactivator-3 (SRC-3), or thyroid hormone receptor activator molecule 1 (TRAM-1).

Key takeaways

Nuclear receptor coactivator 3 belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Nuclear receptor coactivator 3 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Nuclear receptor coactivator 3 from memory before moving on to harder problems.

Reference excerpt

The nuclear receptor coactivator 3 also known as NCOA3 is a protein that, in humans, is encoded by the NCOA3 gene. NCOA3 is also frequently called 'amplified in breast 1' (AIB1), steroid receptor coactivator-3 (SRC-3), or thyroid hormone receptor activator molecule 1 (TRAM-1).

Function NCOA3 is a transcriptional coactivator protein that contains several nuclear receptor interacting domains and an intrinsic histone acetyltransferase activity. NCOA3 is recruited to DNA promotion sites by ligand-activated nuclear receptors. NCOA3, in turn, acylates histones, which makes downstream DNA more accessible to transcription. Hence, NCOA3 assists nuclear receptors in the upregulation of gene expression.

Clinical significance The ratio of PAX2 to AIB-1 protein expression may be predictive of the effectiveness of tamoxifen in breast cancer treatment. Several molecular mechanisms implicate NCOA3 (AIB1) in the endocrine therapy resistance (depicted in the figure). Signaling pathways or mutations (i.e. HER2/neu overexpression, activating mutations in PIK3CA (PI3K), activating mutations in the proto-oncogene tyrosine-protein kinase Src, etc.) that lead to persistent activation of ERK and/or PIK3CA/AKT kinase pathways result, in one hand in an enhanced AIB1 transcriptional coactivation capacity, and in the other hand in the inhibition of the proteasome-dependent AIB1 turn-over and therefore, in AIB1 overexpression. In both conditions, the equilibrium of estrogen receptor (ER) complex formation is displaced towards a transcriptionally active complex and thus, counteracting the inhibition caused by anti-estrogenic drugs such as tamoxifen or fulvestrant (selective estrogen receptor modulators). The result is the restoration of estrogen-sensitive gene transcription and the promotion of cancer progression and/or relapse. Notably, tumors diagnosed with concomitant overexpression of AIB1 and HER2/neu have worse outcome with tamoxifen therapy than all other patients combined. In addition, dormant tumor cells of luminal breast cancers treated with endocrine therapy may acquire with time, mutations that alter kinase signalling pathways and ultimately enhance AIB1 oncogenic functions. Also, estrogen receptor-PAX2 complexes repress HER2/neu expression, but loss of PAX2 expression may result in de novo HER2/neu expression and initiate endocrine therapy resistance and relapse.

Interactions Nuclear receptor coactivator 3 has been shown to interact with:

Nuclear Factor Kappa B,

References

External links nuclear receptor coactivator 3 at the U.S. National Library of Medicine Medical Subject Headings (MeSH) NURSA C91

Illustrations

Worked examples

Example 1 — a first encounter with Nuclear receptor coactivator 3

Start with the simplest possible case. Write down what Nuclear receptor coactivator 3 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, 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 Nuclear receptor coactivator 3 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 Nuclear receptor coactivator 3 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 Nuclear receptor coactivator 3

In research: Nuclear receptor coactivator 3 appears in physics 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 Nuclear receptor coactivator 3 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: Nuclear receptor coactivator 3 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 20, PAS-domain-containing proteins, Transcription coregulators, so understanding it makes those chapters shorter.
In everyday life: Look for Nuclear receptor coactivator 3 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 Nuclear receptor coactivator 3 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Nuclear receptor coactivator 3 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 Nuclear receptor coactivator 3 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Nuclear receptor coactivator 3 in simple terms?

Why does Nuclear receptor coactivator 3 matter?

Because it connects several physics 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 Nuclear receptor coactivator 3?

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 Nuclear receptor coactivator 3.