biology

Pyruvate dehydrogenase (cytochrome)

Pyruvate dehydrogenase (cytochrome) 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 Pyruvate dehydrogenase (cytochrome) rather than just read about it. In short: In enzymology, a pyruvate dehydrogenase (cytochrome) (EC 1.2.2.2) is an enzyme that catalyzes the chemical reaction pyruvate + ferricytochrome b1 + H2O ⇌ {\displaystyle \rightleftharpoons } acetate + CO2 + ferrocytochrome b1 The 3 substrates of this enzyme are pyruvate, ferricytochrome b1, and H2O, whereas its 3 products are acetate, CO2, and ferrocytochrome b1. This enzyme belongs to the family of oxidoreductases…

Key takeaways

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

Reference excerpt

In enzymology, a pyruvate dehydrogenase (cytochrome) (EC 1.2.2.2) is an enzyme that catalyzes the chemical reaction

pyruvate + ferricytochrome b1 + H2O ⇌ {\displaystyle \rightleftharpoons } acetate + CO2 + ferrocytochrome b1 The 3 substrates of this enzyme are pyruvate, ferricytochrome b1, and H2O, whereas its 3 products are acetate, CO2, and ferrocytochrome b1. This enzyme belongs to the family of oxidoreductases, specifically those acting on the aldehyde or oxo group of donor with a cytochrome as acceptor. The systematic name of this enzyme class is pyruvate:ferricytochrome-b1 oxidoreductase. Other names in common use include pyruvate dehydrogenase, pyruvic dehydrogenase, pyruvic (cytochrome b1) dehydrogenase, pyruvate:ubiquinone-8-oxidoreductase, and pyruvate oxidase (ambiguous). This enzyme participates in pyruvate metabolism. It has 2 cofactors: FAD, and Thiamin diphosphate.

References

Williams FR; Hager LP (1961). "A crystalline flavin pyruvate oxidase". J. Biol. Chem. 236 (6): PC36–PC37. doi:10.1016/S0021-9258(19)63324-7. PMID 13785427. Koland JG, Gennis RB (1982). "Identification of an active site cysteine residue in Escherichia coli pyruvate oxidase". J. Biol. Chem. 257 (11): 6023–7. doi:10.1016/S0021-9258(20)65099-2. PMID 7042705.

Worked examples

Example 1 — a first encounter with Pyruvate dehydrogenase (cytochrome)

Start with the simplest possible case. Write down what Pyruvate dehydrogenase (cytochrome) 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 Pyruvate dehydrogenase (cytochrome) 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 Pyruvate dehydrogenase (cytochrome) 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 Pyruvate dehydrogenase (cytochrome)

In research: Pyruvate dehydrogenase (cytochrome) 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 Pyruvate dehydrogenase (cytochrome) 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: Pyruvate dehydrogenase (cytochrome) is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 1.2.2, EC 1.2 stubs, Enzymes of unknown structure, so understanding it makes those chapters shorter.
In everyday life: Look for Pyruvate dehydrogenase (cytochrome) 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 Pyruvate dehydrogenase (cytochrome) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Pyruvate dehydrogenase (cytochrome) 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 Pyruvate dehydrogenase (cytochrome) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Pyruvate dehydrogenase (cytochrome) in simple terms?

In enzymology, a pyruvate dehydrogenase (cytochrome) (EC 1.2.2.2) is an enzyme that catalyzes the chemical reaction pyruvate + ferricytochrome b1 + H2O ⇌ {\displaystyle \rightleftharpoons } acetate + CO2 + ferrocytochrome b1 The 3 substrates of this enzyme are pyruvate, ferricytochrome b1, and H2O…

Why does Pyruvate dehydrogenase (cytochrome) 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 Pyruvate dehydrogenase (cytochrome)?

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 Pyruvate dehydrogenase (cytochrome).