engineering

Tropinone reductase II

Tropinone reductase II 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 Tropinone reductase II rather than just read about it. In short: In enzymology, a tropinone reductase II (EC 1.1.1.236) is an enzyme that catalyzes the chemical reaction pseudotropine + NADP+ ⇌ {\displaystyle \rightleftharpoons } tropinone + NADPH + H+ Thus, the two substrates of this enzyme are pseudotropine and NADP+, whereas its 3 products are tropinone, NADPH, and H+. This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor w…

Key takeaways

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Reproduce the core statement of Tropinone reductase II from memory before moving on to harder problems.

Reference excerpt

In enzymology, a tropinone reductase II (EC 1.1.1.236) is an enzyme that catalyzes the chemical reaction

pseudotropine + NADP+ ⇌ {\displaystyle \rightleftharpoons } tropinone + NADPH + H+ Thus, the two substrates of this enzyme are pseudotropine and NADP+, whereas its 3 products are tropinone, NADPH, and H+. This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is pseudotropine:NADP+ 3-oxidoreductase. Other names in common use include tropinone (psi-tropine-forming) reductase, pseudotropine forming tropinone reductase, tropinone reductase (ambiguous), and TR-II. This enzyme participates in alkaloid biosynthesis ii.

Structural studies As of late 2007, 6 structures have been solved for this class of enzymes, with PDB accession codes PDB: 1AE1, PDB: 1IPE, PDB: 1IPF, PDB: 1XHL, PDB: 2AE1, and PDB: 2AE2.

References

Drager B, Hashimoto T, Yamada Y (1988). "Purification and characterization of pseudotropine forming tropinone reductase from Hyoscyamus niger root cultures". Agric. Biol. Chem. 52 (10): 2663–2667. doi:10.1271/bbb1961.52.2663. Couladis MM, Friesen JB, Landgrebe ME, Leete E (1991). "Enzymes catalysing the reduction of tropinone to tropine and ψ-tropine isolated from the roots of Datura innoxia". Phytochemistry. 30 (3): 801–805. Bibcode:1991PChem..30..801C. doi:10.1016/0031-9422(91)85255-X. Nakajima K, Hashimoto T, Yamada Y (1993). "Two tropinone reductases with different stereospecificities are short-chain dehydrogenases evolved from a common ancestor". Proc. Natl. Acad. Sci. U.S.A. 90 (20): 9591–5. Bibcode:1993PNAS...90.9591N. doi:10.1073/pnas.90.20.9591. PMC 47615. PMID 8415746. Drager B (2006). "Tropinone reductases, enzymes at the branch point of tropane alkaloid metabolism". Phytochemistry. 67 (4): 327–37. Bibcode:2006PChem..67..327D. doi:10.1016/j.phytochem.2005.12.001. PMID 16426652.

Worked examples

Example 1 — a first encounter with Tropinone reductase II

Start with the simplest possible case. Write down what Tropinone reductase II 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 Tropinone reductase II 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 Tropinone reductase II 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 Tropinone reductase II

In research: Tropinone reductase II 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 Tropinone reductase II 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: Tropinone reductase II is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 1.1.1, EC 1.1.1 stubs, Enzymes of known structure, so understanding it makes those chapters shorter.
In everyday life: Look for Tropinone reductase II 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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Frequently asked questions

What is Tropinone reductase II in simple terms?

In enzymology, a tropinone reductase II (EC 1.1.1.236) is an enzyme that catalyzes the chemical reaction pseudotropine + NADP+ ⇌ {\displaystyle \rightleftharpoons } tropinone + NADPH + H+ Thus, the two substrates of this enzyme are pseudotropine and NADP+, whereas its 3 products are tropinone, NADP…

Why does Tropinone reductase II 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 Tropinone reductase II?

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 Tropinone reductase II.