engineering

Nicotinamide N-methyltransferase

Nicotinamide N-methyltransferase 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 Nicotinamide N-methyltransferase rather than just read about it. In short: Nicotinamide N-methyltransferase (NNMT) (EC 2.1.1.1) is an enzyme that catalyzes the chemical reaction The enzyme catalyses a methylation reaction in which nicotinamide is converted to 1-methylnicotinamide. The methyl group comes from the cofactor, S-adenosyl methionine (SAM), which loses its methyl group and becomes S-adenosyl-L-homocysteine (SAH).

Key takeaways

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

Reference excerpt

Nicotinamide N-methyltransferase (NNMT) (EC 2.1.1.1) is an enzyme that catalyzes the chemical reaction

The enzyme catalyses a methylation reaction in which nicotinamide is converted to 1-methylnicotinamide. The methyl group comes from the cofactor, S-adenosyl methionine (SAM), which loses its methyl group and becomes S-adenosyl-L-homocysteine (SAH). This enzyme belongs to the family of transferases, specifically those transferring one-carbon group methyltransferases. The systematic name of this enzyme class is S-adenosyl-L-methionine:nicotinamide N-methyltransferase. This enzyme is also called nicotinamide methyltransferase.

Function This enzyme participates in nicotinate and nicotinamide metabolism. In humans it is encoded by the NNMT gene. NNMT affects a biochemical mechanism known as a futile cycle, which plays a role in metabolic regulation. NNMT is found in human fat cells and the liver. NNMT processes vitamin B3 and has been linked with certain types of cancer. Silencing the gene that codes for NNMT reduces its presence and increases the presence of sugar transporter GLUT4. Mice that produced large amounts of GLUT4 were insulin sensitive and protected against diabetes, while mice with no GLUT4 were insulin resistant and at risk. High levels of NNMT are often found in the fat cells of animals that are insulin resistant. When the researchers silenced the NNMT gene in mice on high-fat diets, the mice gained less weight than those in whom the NNMT gene was functioning normally. (The mice did not change their eating or exercise habits). Antisense oligonucleotide (ASO) technology can be used to silence the expression of the NNMT gene only in fat and liver cells. ASOs are short strings of DNA that can be designed to prevent the synthesis of specific proteins. ASOs have been approved for use by the U.S. Food and Drug Administration for the treatment of conditions with other genetic causes—such as elevated cholesterol and hyperlipidemia.

Structural studies As of late 2007, two structures have been solved for this class of enzymes, with PDB accession codes PDB: 2I62 and PDB: 2IIP.

References

Illustrations

Worked examples

Example 1 — a first encounter with Nicotinamide N-methyltransferase

Start with the simplest possible case. Write down what Nicotinamide N-methyltransferase 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 Nicotinamide N-methyltransferase 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 Nicotinamide N-methyltransferase 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 Nicotinamide N-methyltransferase

In research: Nicotinamide N-methyltransferase 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 Nicotinamide N-methyltransferase 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: Nicotinamide N-methyltransferase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 2.1.1, EC 2.1 stubs, Enzymes of known structure, so understanding it makes those chapters shorter.
In everyday life: Look for Nicotinamide N-methyltransferase 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 Nicotinamide N-methyltransferase in 20 minutes

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Frequently asked questions

What is Nicotinamide N-methyltransferase in simple terms?

Nicotinamide N-methyltransferase (NNMT) (EC 2.1.1.1) is an enzyme that catalyzes the chemical reaction The enzyme catalyses a methylation reaction in which nicotinamide is converted to 1-methylnicotinamide. The methyl group comes from the cofactor, S-adenosyl methionine (SAM), which loses its methy…

Why does Nicotinamide N-methyltransferase 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 Nicotinamide N-methyltransferase?

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 Nicotinamide N-methyltransferase.