biology

Hydrogen dehydrogenase

Hydrogen dehydrogenase 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 Hydrogen dehydrogenase rather than just read about it. In short: In enzymology, a hydrogen dehydrogenase (EC 1.12.1.2) is an enzyme that catalyzes the chemical reaction H2 + NAD+ ⇌ {\displaystyle \rightleftharpoons } H+ + NADH Thus, the two substrates of this enzyme are H2 and NAD+, whereas its two products are H+ and NADH. This enzyme belongs to the family of oxidoreductases, specifically those acting on hydrogen as donor with NAD+ or NADP+ as acceptor.

Key takeaways

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

Reference excerpt

In enzymology, a hydrogen dehydrogenase (EC 1.12.1.2) is an enzyme that catalyzes the chemical reaction

H2 + NAD+ ⇌ {\displaystyle \rightleftharpoons } H+ + NADH Thus, the two substrates of this enzyme are H2 and NAD+, whereas its two products are H+ and NADH. This enzyme belongs to the family of oxidoreductases, specifically those acting on hydrogen as donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is hydrogen:NAD+ oxidoreductase. Other names in common use include H2:NAD+ oxidoreductase, NAD+-linked hydrogenase, bidirectional hydrogenase, and hydrogenase. This enzyme participates in glyoxylate and dicarboxylate metabolism and methane metabolism. It has 6 cofactors: FAD, Iron, FMN, Flavin, Nickel, and Iron-sulfur.

References

BONE DH, BERNSTEIN S, VISHNIAC W (1963). "Purification and some properties of different forms of hydrogen dehydrogenase". Biochim. Biophys. Acta. 67: 581–8. doi:10.1016/0006-3002(63)91868-7. PMID 13968752. Schneider K, Schlegel HG (1976). "Purification and properties of soluble hydrogenase from Alcaligenes eutrophus H 16". Biochim. Biophys. Acta. 452 (1): 66–80. doi:10.1016/0005-2744(76)90058-9. PMID 186126.

Worked examples

Example 1 — a first encounter with Hydrogen dehydrogenase

Start with the simplest possible case. Write down what Hydrogen dehydrogenase 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 Hydrogen dehydrogenase 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 Hydrogen dehydrogenase 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 Hydrogen dehydrogenase

In research: Hydrogen dehydrogenase 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 Hydrogen dehydrogenase 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: Hydrogen dehydrogenase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 1.12.1, Enzymes of unknown structure, Flavoproteins, so understanding it makes those chapters shorter.
In everyday life: Look for Hydrogen dehydrogenase 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 Hydrogen dehydrogenase in 20 minutes

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

Frequently asked questions

What is Hydrogen dehydrogenase in simple terms?

In enzymology, a hydrogen dehydrogenase (EC 1.12.1.2) is an enzyme that catalyzes the chemical reaction H2 + NAD+ ⇌ {\displaystyle \rightleftharpoons } H+ + NADH Thus, the two substrates of this enzyme are H2 and NAD+, whereas its two products are H+ and NADH. This enzyme belongs to the family of o…

Why does Hydrogen dehydrogenase 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 Hydrogen dehydrogenase?

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 Hydrogen dehydrogenase.