engineering

Linoleoyl-CoA desaturase

Linoleoyl-CoA desaturase is a engineering 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 Linoleoyl-CoA desaturase rather than just read about it. In short: Linoleoyl-CoA desaturase (also Delta 6 desaturase, EC 1.14.19.3) is an enzyme that converts between types of fatty acids, which are essential nutrients in the human body. The enzyme mainly catalyzes the chemical reaction linoleoyl-CoA + AH2 + O2 ⇌ {\displaystyle \rightleftharpoons } gamma-linolenoyl-CoA + A + 2 H2O The three substrates of this enzyme are linoleoyl-CoA, an electron acceptor AH2, and O2, whereas its t…

Key takeaways

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

Reference excerpt

Linoleoyl-CoA desaturase (also Delta 6 desaturase, EC 1.14.19.3) is an enzyme that converts between types of fatty acids, which are essential nutrients in the human body. The enzyme mainly catalyzes the chemical reaction

linoleoyl-CoA + AH2 + O2 ⇌ {\displaystyle \rightleftharpoons } gamma-linolenoyl-CoA + A + 2 H2O The three substrates of this enzyme are linoleoyl-CoA, an electron acceptor AH2, and O2, whereas its three products are gamma-linolenoyl-CoA, the reduction product A, and H2O. This enzyme belongs to the family of oxidoreductases, specifically those acting on paired donors, with O2 as oxidant and incorporation or reduction of oxygen. The oxygen incorporated need not be derived from O2 with oxidation of a pair of donors resulting in the reduction of O to two molecules of water. The systematic name of this enzyme class is linoleoyl-CoA,hydrogen-donor:oxygen oxidoreductase. Other names in common use include acyl-CoA 6-desaturase, Delta6-desaturase (D6D or Δ-6-desaturase), Delta6-fatty acyl-CoA desaturase, Delta6-acyl CoA desaturase, fatty acid Delta6-desaturase, fatty acid 6-desaturase, linoleate desaturase, linoleic desaturase, linoleic acid desaturase, linoleoyl CoA desaturase, linoleoyl-coenzyme A desaturase, and long-chain fatty acid Delta6-desaturase. This enzyme participates in linoleic acid metabolism. It employs one cofactor, iron. The enzyme is molecularly identical across all living things. It is present in animals, plants, fungi, and cyanobacteria. D6D is one of the three fatty acid desaturases present in humans along with Δ-5 and Δ-9, named so because it was thought to desaturate bond between carbons 6 and 7, counting from carboxyl group (with the carboxyl group carbon numbered one). The number 6 in the name of the enzyme has nothing to do with omega-6 fatty acids. In humans, D6D is encoded by the FADS2 gene.

Function D6D is a desaturase enzyme, i.e. it introduces a double bond in a specific position of long-chain fatty acids. D6D is necessary to synthesize longer chain omega-3 and omega-6 fatty acids. In humans, it is used principally for the conversions of cis-linoleic acid to gamma-linolenic acid (GLA), and palmitic acid to sapienic acid. It also converts alpha-linolenic acid (ALA) to stearidonic acid and tetracosatetraenoic acid to tetracosapentaenoic acid, intermediate steps in the synthesis of ALA to EPA and of EPA to DHA, respectively.

Toxoplasma gondii Felines lack D6D activity in their guts and accumulate systemic linoleic acid. This increase in linoleic acid in cats has an influence in causing the sexual cycle of Toxoplasma gondii to be restricted to felines, with linoleic acid stimulating T. gondii sexual reproduction.

References

Okayasu T, Nagao M, Ishibashi T, Imai Y (1981). "Purification and partial characterization of linoleoyl-CoA desaturase from rat liver microsomes". Arch. Biochem. Biophys. 206 (1): 21–28. doi:10.1016/0003-9861(81)90061-8. PMID 7212717.

Worked examples

Example 1 — a first encounter with Linoleoyl-CoA desaturase

Start with the simplest possible case. Write down what Linoleoyl-CoA desaturase claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, 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 Linoleoyl-CoA desaturase 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 Linoleoyl-CoA desaturase 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 Linoleoyl-CoA desaturase

In research: Linoleoyl-CoA desaturase appears in engineering 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 Linoleoyl-CoA desaturase 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: Linoleoyl-CoA desaturase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 1.14.19, Enzymes of unknown structure, Iron enzymes, so understanding it makes those chapters shorter.
In everyday life: Look for Linoleoyl-CoA desaturase 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 Linoleoyl-CoA desaturase in 20 minutes

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

Frequently asked questions

What is Linoleoyl-CoA desaturase in simple terms?

Why does Linoleoyl-CoA desaturase matter?

Because it connects several engineering 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 Linoleoyl-CoA desaturase?

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 Linoleoyl-CoA desaturase.