engineering

TRNA (guanine-N7-)-methyltransferase

TRNA (guanine-N7-)-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 TRNA (guanine-N7-)-methyltransferase rather than just read about it. In short: In enzymology, a tRNA (guanine-N7-)-methyltransferase (EC 2.1.1.33) is an enzyme that catalyzes the chemical reaction S-adenosyl-L-methionine + tRNA ⇌ {\displaystyle \rightleftharpoons } S-adenosyl-L-homocysteine + tRNA containing N7-methylguanine Thus, the two substrates of this enzyme are S-adenosyl methionine and tRNA, whereas its two products are S-adenosylhomocysteine and tRNA containing N7-methylguanine. This…

Key takeaways

TRNA (guanine-N7-)-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 TRNA (guanine-N7-)-methyltransferase to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of TRNA (guanine-N7-)-methyltransferase from memory before moving on to harder problems.

Reference excerpt

In enzymology, a tRNA (guanine-N7-)-methyltransferase (EC 2.1.1.33) is an enzyme that catalyzes the chemical reaction

S-adenosyl-L-methionine + tRNA ⇌ {\displaystyle \rightleftharpoons } S-adenosyl-L-homocysteine + tRNA containing N7-methylguanine Thus, the two substrates of this enzyme are S-adenosyl methionine and tRNA, whereas its two products are S-adenosylhomocysteine and tRNA containing N7-methylguanine. 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:tRNA (guanine-N7-)-methyltransferase. Other names in common use include transfer ribonucleate guanine 7-methyltransferase, 7-methylguanine transfer ribonucleate methylase, tRNA guanine 7-methyltransferase, N7-methylguanine methylase, and S-adenosyl-L-methionine:tRNA (guanine-7-N-)-methyltransferase.

Structural studies As of late 2007, two structures have been solved for this class of enzymes, with PDB accession codes PDB: 1YZH and PDB: 2FCA.

References

Hurwitz J, Gold M, Anders M (1964). "The Enzymatic Methylation of Ribonucleic Acid and Deoxyribonucleic Acid. 3. Purification of Soluble Ribonucleic Acid-Methylating Enzymes". J. Biol. Chem. 239: 3462–3473. doi:10.1016/S0021-9258(18)97746-X. PMID 14245404. Bjork GR, Svensson I (1969). "Studies on microbial RNA. Fractionation of tRNA methylases from Saccharomyces cerevisiae". Eur. J. Biochem. 9 (2): 207–215. doi:10.1111/j.1432-1033.1969.tb00596.x. PMID 4896260. Aschhoff HJ, Elten H, Arnold HH, Mahal G, Kersten W, Kersten H (1976). "7-Methylguanine specific tRNA-methyltransferase from Escherichia coli". Nucleic Acids Res. 3 (11): 3109–22. doi:10.1093/nar/3.11.3109. PMC 343155. PMID 794833. Salvatore F, Traboni C, Colonna A, Ciliberto G, Paoletta C, Cimino F (1980). Cavallini D, Gaul GE, Zappia V (eds.). Natural Sulfur Compounds. New York: Plenum Press. p. 25.

Worked examples

Example 1 — a first encounter with TRNA (guanine-N7-)-methyltransferase

Start with the simplest possible case. Write down what TRNA (guanine-N7-)-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 TRNA (guanine-N7-)-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 TRNA (guanine-N7-)-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 TRNA (guanine-N7-)-methyltransferase

In research: TRNA (guanine-N7-)-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 TRNA (guanine-N7-)-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: TRNA (guanine-N7-)-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 TRNA (guanine-N7-)-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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “TRNA (guanine-N7-)-methyltransferase” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study TRNA (guanine-N7-)-methyltransferase in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what TRNA (guanine-N7-)-methyltransferase 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 TRNA (guanine-N7-)-methyltransferase out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is TRNA (guanine-N7-)-methyltransferase in simple terms?

In enzymology, a tRNA (guanine-N7-)-methyltransferase (EC 2.1.1.33) is an enzyme that catalyzes the chemical reaction S-adenosyl-L-methionine + tRNA ⇌ {\displaystyle \rightleftharpoons } S-adenosyl-L-homocysteine + tRNA containing N7-methylguanine Thus, the two substrates of this enzyme are S-adeno…

Why does TRNA (guanine-N7-)-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 TRNA (guanine-N7-)-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 TRNA (guanine-N7-)-methyltransferase.