science

Lanthanide-dependent methanol dehydrogenase

Lanthanide-dependent methanol dehydrogenase is a science 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 Lanthanide-dependent methanol dehydrogenase rather than just read about it. In short: Lanthanide-dependent methanol dehydrogenase is an oxidoreductase enzyme involved in methane metabolic pathways in microbial metabolism. This enzyme was first isolated from Methylacidiphilum fumariolicum and others in the Methylacidiphilum family.

Key takeaways

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

Reference excerpt

Lanthanide-dependent methanol dehydrogenase is an oxidoreductase enzyme involved in methane metabolic pathways in microbial metabolism. This enzyme was first isolated from Methylacidiphilum fumariolicum and others in the Methylacidiphilum family. The enzyme requires La3+, Ce3+, Pr3+ or Nd3+. Higher lanthanides show decreasing activity with Sm3+, Eu3+ and Gd3+. The lanthanide atom in the enzyme is coordinated by pyrroloquinoline quinone. The enzyme catalyzes the following reaction:

2 Fe(III)-cytochrome cL + methanol -> 2 Fe(II)-cytochrome cL + formaldehyde + 2 H+

Background Methylotrophic bacteria are those that consume one-carbon and methylated compounds as the primary carbon source. These bacteria have been known for a century and are largely important in methane and methanol biogeochemical cycles. For the majority of the history of studies on these enzymes, pyrroloquinoline quinone (PQQ)-dependent methanol dehydrogenases were said to be the primary enzymes for the oxidation of methanol. The machinery of the PQQ-dependent enzyme is largely Conserved among the α, β, and γ-protebacteria.

The discovery of lanthanide-dependent methanol dehydrogenases changed this belief, originally a seen as a homolog of MoxF. Several of these enzymes showed methanol dehydrogenase activity in the presence of lanthanide ions such as Ln3+. In the study of metaloenzymes, it was originally believed that Ln3+ was biologically unimportant, but the discovery of Ln3+-dependent AHDs revealed more about the biological activity of lanthanides.

Structure In the homodimeric Ce3+-dependent methanol dehydrogenase sampled from methylacidiphilum fuimariolicum SolIV, the active site consists of glutamate, asparagine and aspartic acid residues that form a coordination complex for the Cerium ion. In protein crystallization studies, a molecule of polyethylene glycol occupies a substrate binding coordination position of Ce3+. The bacterial enzymes are known to interact with two cytochromes, cL and cH. Once methanol is oxidized, PQQ is reduced. The re-oxidation of PQQ is facilitated through the stepwise electron transfer to the cytochromes.

Reaction The reaction catalyzed by lanthanide-dependent methanol dehydrogenase is one that oxidizes methanol to form formaldehyde and hydrogen ions. The essential cofactors include a PQQ prosthetic group at the active site, in addition to essential cytochromes present for electron transfer. The enzyme acts at the CH-OH site.

MDHs in the methylobacterium species are typically shown to depend also on Ca2+ when grown on methanol. However, studies conducted with MDH on a methanol-substrate that were given only Ln3+ and not Ca3+ showed growth, indicating that MDHs (particularly Ln3+-dependent ones) can oxidize menthol and form formaldehyde even without calcium ions present.

Notes

References

Illustrations

Lanthanide-dependent methanol dehydrogenase illustration

Worked examples

Example 1 — a first encounter with Lanthanide-dependent methanol dehydrogenase

Start with the simplest possible case. Write down what Lanthanide-dependent methanol dehydrogenase claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Lanthanide-dependent methanol 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 Lanthanide-dependent methanol 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 Lanthanide-dependent methanol dehydrogenase

In research: Lanthanide-dependent methanol dehydrogenase appears in science 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 Lanthanide-dependent methanol 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: Lanthanide-dependent methanol dehydrogenase is common in secondary-school and first-year university syllabi. It links to neighbouring topics Enzymes, Transferases, so understanding it makes those chapters shorter.
In everyday life: Look for Lanthanide-dependent methanol 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 Lanthanide-dependent methanol dehydrogenase in 20 minutes

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

Frequently asked questions

What is Lanthanide-dependent methanol dehydrogenase in simple terms?

Why does Lanthanide-dependent methanol dehydrogenase matter?

Because it connects several science 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 Lanthanide-dependent methanol 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 Lanthanide-dependent methanol dehydrogenase.