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Sirtuin 4

Sirtuin 4 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 Sirtuin 4 rather than just read about it. In short: Sirtuin 4, also known as SIRT4, is a mitochondrial protein which in humans is encoded by the SIRT4 gene. SIRT4 is member of the mammalian sirtuin family of proteins, which are homologs to the yeast Sir2 protein.

Sirtuin 4 — main illustration
Sirtuin 4 — illustration

Key takeaways

  • Sirtuin 4 belongs to biology; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Sirtuin 4 to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Sirtuin 4 from memory before moving on to harder problems.

Reference excerpt

Sirtuin 4, also known as SIRT4, is a mitochondrial protein which in humans is encoded by the SIRT4 gene. SIRT4 is member of the mammalian sirtuin family of proteins, which are homologs to the yeast Sir2 protein. SIRT4 exhibits NAD+-dependent deacetylase activity.

Function SIRT4 is a mitochondrial ADP-ribosyltransferase that inhibits mitochondrial glutamate dehydrogenase 1 activity, thereby downregulating insulin secretion in response to amino acids. A deacetylation of malonyl-CoA decarboxylase enzyme by SIRT4 represses the enzyme activity, inhibiting fatty acid oxidation in muscle and liver cells. SIRT4 has a suppressive effect on peroxisome proliferator-activated receptor alpha (PPAR-α) which downregulates fatty acid oxidation in liver cells. Deacetylation of ADP/ATP translocase 2 (ANT2) increases cellular ATP by dampening mitochondrial uncoupling.

Clinical significance SIRT4 is a mitochondrial tumor suppressor protein. Overexpression of SIRT4 inhibits cancer cell proliferation by inhibition of glutamine metabolism.

Ligands Inhibitors UBCS385

References

Further reading

This article incorporates text from the United States National Library of Medicine, which is in the public domain.

Illustrations

Sirtuin 4 illustration
Sirtuin 4 illustration
Sirtuin 4 illustration
Sirtuin 4 illustration

Worked examples

Example 1 — a first encounter with Sirtuin 4

Start with the simplest possible case. Write down what Sirtuin 4 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 Sirtuin 4 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 Sirtuin 4 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 Sirtuin 4

In research
Sirtuin 4 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 Sirtuin 4 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
Sirtuin 4 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 12, Human chromosome 12 gene stubs, so understanding it makes those chapters shorter.
In everyday life
Look for Sirtuin 4 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 Sirtuin 4 in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Sirtuin 4 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 Sirtuin 4 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sirtuin 4 in simple terms?

Sirtuin 4, also known as SIRT4, is a mitochondrial protein which in humans is encoded by the SIRT4 gene. SIRT4 is member of the mammalian sirtuin family of proteins, which are homologs to the yeast Sir2 protein.

Why does Sirtuin 4 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 Sirtuin 4?

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 Sirtuin 4.

Tags

  • Genes on human chromosome 12
  • Human chromosome 12 gene stubs

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