chemistry

Polyenoic fatty acid isomerase

Polyenoic fatty acid isomerase is a chemistry 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 Polyenoic fatty acid isomerase rather than just read about it. In short: In enzymology, a polyenoic fatty acid isomerase (EC 5.3.3.13) is an enzyme that catalyzes the chemical reaction (5Z,8Z,11Z,14Z,17Z)-icosapentaenoate ⇌ {\displaystyle \rightleftharpoons } (5Z,7E,9E,14Z,17Z)-icosapentaenoate Hence, this enzyme has one substrate, (5Z,8Z,11Z,14Z,17Z)-icosapentaenoate, and one product, (5Z,7E,9E,14Z,17Z)-icosapentaenoate. This enzyme belongs to the family of isomerases, specifically thos…

Key takeaways

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

Reference excerpt

In enzymology, a polyenoic fatty acid isomerase (EC 5.3.3.13) is an enzyme that catalyzes the chemical reaction

(5Z,8Z,11Z,14Z,17Z)-icosapentaenoate ⇌ {\displaystyle \rightleftharpoons } (5Z,7E,9E,14Z,17Z)-icosapentaenoate Hence, this enzyme has one substrate, (5Z,8Z,11Z,14Z,17Z)-icosapentaenoate, and one product, (5Z,7E,9E,14Z,17Z)-icosapentaenoate. This enzyme belongs to the family of isomerases, specifically those intramolecular oxidoreductases transposing C=C bonds. The systematic name of this enzyme class is (5Z,8Z,11Z,14Z,17Z)-icosapentaenoate Delta8,11-Delta7,9-isomerase (trans-double-bond-forming). Other names in common use include PFI, eicosapentaenoate cis-Delta5,8,11,14,17-eicosapentaenoate, cis-Delta5-trans-Delta7,9-cis-Delta14,17 isomerase, (5Z,8Z,11Z,14Z,17Z)-eicosapentaenoate Delta8,11-Delta7,8-isomerase, (incorrect), (5Z,8Z,11Z,14Z,17Z)-eicosapentaenoate Delta8,11-Delta7,9-isomerase, and (trans-double-bond-forming).

References

Wise ML, Hamberg M, Gerwick WH (1994). "Biosynthesis of conjugated triene-containing fatty acids by a novel isomerase from the red marine alga Ptilota filicina". Biochemistry. 33 (51): 15223–32. doi:10.1021/bi00255a002. PMID 7803384. Wise ML, Soderstrom K, Murray TF, Gerwick WH (1996). "Synthesis and cannabinoid receptor binding activity of conjugated triene anandamide, a novel eicosanoid". Experientia. 52 (1): 88–92. doi:10.1007/BF01922423. PMID 8575565. Wise ML, Rossi J, Gerwick WH (1997). "Characterization of the substrate binding site of polyenoic fatty acid isomerase, a novel enzyme from the marine alga Ptilota filicina". Biochemistry. 36 (10): 2985–92. doi:10.1021/bi962158v. PMID 9062129. Zheng W, Wise ML, Wyrick A, Metz JG, Yuan L, Gerwick WH (2002). "Polyenoic fatty acid isomerase from the marine alga Ptilota filicina: protein characterization and functional expression of the cloned cDNA". Arch. Biochem. Biophys. 401 (1): 11–20. doi:10.1016/S0003-9861(02)00002-4. PMID 12054482.

Worked examples

Example 1 — a first encounter with Polyenoic fatty acid isomerase

Start with the simplest possible case. Write down what Polyenoic fatty acid isomerase claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, 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 Polyenoic fatty acid isomerase 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 Polyenoic fatty acid isomerase 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 Polyenoic fatty acid isomerase

In research: Polyenoic fatty acid isomerase appears in chemistry 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 Polyenoic fatty acid isomerase 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: Polyenoic fatty acid isomerase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 5.3.3, Enzymes of unknown structure, Isomerase stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Polyenoic fatty acid isomerase 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 Polyenoic fatty acid isomerase in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Polyenoic fatty acid isomerase means in your own words.
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Frequently asked questions

What is Polyenoic fatty acid isomerase in simple terms?

In enzymology, a polyenoic fatty acid isomerase (EC 5.3.3.13) is an enzyme that catalyzes the chemical reaction (5Z,8Z,11Z,14Z,17Z)-icosapentaenoate ⇌ {\displaystyle \rightleftharpoons } (5Z,7E,9E,14Z,17Z)-icosapentaenoate Hence, this enzyme has one substrate, (5Z,8Z,11Z,14Z,17Z)-icosapentaenoate…

Why does Polyenoic fatty acid isomerase matter?

Because it connects several chemistry 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 Polyenoic fatty acid isomerase?

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 Polyenoic fatty acid isomerase.