biology

Protein-histidine N-methyltransferase

Protein-histidine N-methyltransferase 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 Protein-histidine N-methyltransferase rather than just read about it. In short: In enzymology, a protein-histidine N-methyltransferase (EC 2.1.1.85) is an enzyme that catalyzes the chemical reaction S-adenosyl-L-methionine + protein L-histidine ⇌ {\displaystyle \rightleftharpoons } S-adenosyl-L-homocysteine + protein Ntau-methyl-L-histidine Thus, the two substrates of this enzyme are S-adenosyl methionine and protein L-histidine, whereas its two products are S-adenosylhomocysteine and protein N…

Key takeaways

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

Reference excerpt

In enzymology, a protein-histidine N-methyltransferase (EC 2.1.1.85) is an enzyme that catalyzes the chemical reaction

S-adenosyl-L-methionine + protein L-histidine ⇌ {\displaystyle \rightleftharpoons } S-adenosyl-L-homocysteine + protein Ntau-methyl-L-histidine Thus, the two substrates of this enzyme are S-adenosyl methionine and protein L-histidine, whereas its two products are S-adenosylhomocysteine and protein Ntau-methyl-L-histidine. 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:protein-L-histidine N-tele-methyltransferase. Other names in common use include protein methylase IV, protein (histidine) methyltransferase, actin-specific histidine methyltransferase, and S-adenosyl methionine:protein-histidine N-methyltransferase.

References

Vijayasarathy C, Rao BS (1987). "Partial purification and characterisation of S-adenosylmethionine:protein-histidine N-methyltransferase from rabbit skeletal muscle". Biochim. Biophys. Acta. 923 (1): 156–65. doi:10.1016/0304-4165(87)90139-5. PMID 3801515.

Worked examples

Example 1 — a first encounter with Protein-histidine N-methyltransferase

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

In research: Protein-histidine N-methyltransferase 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 Protein-histidine 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: Protein-histidine 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 unknown structure, so understanding it makes those chapters shorter.
In everyday life: Look for Protein-histidine 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 Protein-histidine N-methyltransferase in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Protein-histidine N-methyltransferase means in your own words.
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Frequently asked questions

What is Protein-histidine N-methyltransferase in simple terms?

In enzymology, a protein-histidine N-methyltransferase (EC 2.1.1.85) is an enzyme that catalyzes the chemical reaction S-adenosyl-L-methionine + protein L-histidine ⇌ {\displaystyle \rightleftharpoons } S-adenosyl-L-homocysteine + protein Ntau-methyl-L-histidine Thus, the two substrates of this enz…

Why does Protein-histidine N-methyltransferase 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 Protein-histidine 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 Protein-histidine N-methyltransferase.