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biology

ID2

ID2 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 ID2 rather than just read about it. In short: DNA-binding protein inhibitor ID-2 is a protein that in humans is encoded by the ID2 gene. Function The protein encoded by this gene belongs to the inhibitor of DNA binding (ID) family, members of which are transcriptional regulators that contain a helix-loop-helix (HLH) domain but not a basic domain.

ID2 — main illustration
ID2 — illustration

Key takeaways

  • ID2 belongs to biology; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect ID2 to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of ID2 from memory before moving on to harder problems.

Reference excerpt

DNA-binding protein inhibitor ID-2 is a protein that in humans is encoded by the ID2 gene.

Function The protein encoded by this gene belongs to the inhibitor of DNA binding (ID) family, members of which are transcriptional regulators that contain a helix-loop-helix (HLH) domain but not a basic domain. Members of the ID family inhibit the functions of basic helix-loop-helix transcription factors in a dominant-negative manner by suppressing their heterodimerization partners through the HLH domains. This protein may play a role in negatively regulating cell differentiation. A pseudogene has been identified for this gene. The ID2 protein may play a role in the development and resistance to therapies of glioblastoma, the most aggressive of brain cancers.

Interactions ID2 has been shown to interact with MyoD and NEDD9.

See also Inhibitor of DNA-binding protein

References

Further reading

External links ID2+protein,+human at the U.S. National Library of Medicine Medical Subject Headings (MeSH) Overview of all the structural information available in the PDB for UniProt: Q02363 (DNA-binding protein inhibitor ID-2) at the PDBe-KB. This article incorporates text from the United States National Library of Medicine, which is in the public domain.

Illustrations

ID2 illustration
ID2 illustration
ID2 illustration
ID2 illustration
ID2 illustration

Worked examples

Example 1 — a first encounter with ID2

Start with the simplest possible case. Write down what ID2 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 ID2 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 ID2 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 ID2

In research
ID2 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 ID2 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
ID2 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 2, Human chromosome 2 gene stubs, Transcription factors, so understanding it makes those chapters shorter.
In everyday life
Look for ID2 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 ID2 in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what ID2 means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain ID2 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is ID2 in simple terms?

DNA-binding protein inhibitor ID-2 is a protein that in humans is encoded by the ID2 gene. Function The protein encoded by this gene belongs to the inhibitor of DNA binding (ID) family, members of which are transcriptional regulators that contain a helix-loop-helix (HLH) domain but not a basic doma…

Why does ID2 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 ID2?

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 ID2.

Tags

  • Genes on human chromosome 2
  • Human chromosome 2 gene stubs
  • Transcription factors

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