engineering

TRNA (uracil-5-)-methyltransferase

TRNA (uracil-5-)-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 (uracil-5-)-methyltransferase rather than just read about it. In short: In enzymology, a tRNA (uracil-5-)-methyltransferase (EC 2.1.1.35) is an enzyme that catalyzes the chemical reaction S-adenosyl-L-methionine + tRNA containing uridine at position 54 ⇌ {\displaystyle \rightleftharpoons } S-adenosyl-L-homocysteine + tRNA containing ribothymidine at position 54 Thus, the two substrates of this enzyme are S-adenosyl methionine and tRNA containing uridine at position 54, whereas its two p…

Key takeaways

TRNA (uracil-5-)-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 (uracil-5-)-methyltransferase to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of TRNA (uracil-5-)-methyltransferase from memory before moving on to harder problems.

Reference excerpt

In enzymology, a tRNA (uracil-5-)-methyltransferase (EC 2.1.1.35) is an enzyme that catalyzes the chemical reaction

S-adenosyl-L-methionine + tRNA containing uridine at position 54 ⇌ {\displaystyle \rightleftharpoons } S-adenosyl-L-homocysteine + tRNA containing ribothymidine at position 54 Thus, the two substrates of this enzyme are S-adenosyl methionine and tRNA containing uridine at position 54, whereas its two products are S-adenosylhomocysteine and tRNA containing ribothymidine at position 54. 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 (uracil-5-)-methyltransferase. Other names in common use include ribothymidyl synthase, transfer RNA uracil 5-methyltransferase, transfer RNA uracil methylase, tRNA uracil 5-methyltransferase, m5U-methyltransferase, tRNA:m5U54-methyltransferase, and RUMT.

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): 207–15. doi:10.1111/j.1432-1033.1969.tb00596.x. PMID 4896260. Greenberg R, Dudock B (1980). "Isolation and characterization of m5U-methyltransferase from Escherichia coli". J. Biol. Chem. 255 (17): 8296–302. doi:10.1016/S0021-9258(19)70646-2. PMID 6997293. Delk AS, Nagle DP, Rabinowitz JC (1980). "Methylenetetrahydrofolate-dependent biosynthesis of ribothymidine in transfer RNA of Streptococcus faecalis. Evidence for reduction of the 1-carbon unit by FADH2". J. Biol. Chem. 255 (10): 4387–90. doi:10.1016/S0021-9258(19)85498-4. PMID 6768721. Kealey JT, Gu X, Santi DV (1994). "Enzymatic mechanism of tRNA (m5U54)methyltransferase". Biochimie. 76 (12): 1133–42. doi:10.1016/0300-9084(94)90042-6. PMID 7748948. Gu X, Ivanetich KM, Santi DV (1996). "Recognition of the T-arm of tRNA by tRNA (m5U54)-methyltransferase is not sequence specific". Biochemistry. 35 (36): 11652–9. doi:10.1021/bi9612125. PMID 8794745. Becker HF, Motorin Y, Sissler M, Florentz C, Grosjean H (1997). "Major identity determinants for enzymatic formation of ribothymidine and pseudouridine in the T psi-loop of yeast tRNAs". J. Mol. Biol. 274 (4): 505–18. doi:10.1006/jmbi.1997.1417. PMID 9417931.

Worked examples

Example 1 — a first encounter with TRNA (uracil-5-)-methyltransferase

Start with the simplest possible case. Write down what TRNA (uracil-5-)-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 (uracil-5-)-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 (uracil-5-)-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 (uracil-5-)-methyltransferase

In research: TRNA (uracil-5-)-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 (uracil-5-)-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 (uracil-5-)-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 TRNA (uracil-5-)-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 TRNA (uracil-5-)-methyltransferase in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what TRNA (uracil-5-)-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 (uracil-5-)-methyltransferase out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is TRNA (uracil-5-)-methyltransferase in simple terms?

In enzymology, a tRNA (uracil-5-)-methyltransferase (EC 2.1.1.35) is an enzyme that catalyzes the chemical reaction S-adenosyl-L-methionine + tRNA containing uridine at position 54 ⇌ {\displaystyle \rightleftharpoons } S-adenosyl-L-homocysteine + tRNA containing ribothymidine at position 54 Thus, t…

Why does TRNA (uracil-5-)-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 (uracil-5-)-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 (uracil-5-)-methyltransferase.