engineering

Polynucleotide 5'-hydroxyl-kinase

Polynucleotide 5'-hydroxyl-kinase 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 Polynucleotide 5'-hydroxyl-kinase rather than just read about it. In short: In enzymology, a polynucleotide 5'-hydroxyl-kinase (EC 2.7.1.78) is an enzyme that catalyzes the chemical reaction ATP + 5'-dephospho-DNA ⇌ {\displaystyle \rightleftharpoons } ADP + 5'-phospho-DNA Thus, the two substrates of this enzyme are ATP and 5'-dephospho-DNA, whereas its two products are ADP and 5'-phospho-DNA. Polynucleotide kinase is a T7 bacteriophage (or T4 bacteriophage) enzyme that catalyzes the transfe…

Key takeaways

Polynucleotide 5'-hydroxyl-kinase belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Polynucleotide 5'-hydroxyl-kinase to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Polynucleotide 5'-hydroxyl-kinase from memory before moving on to harder problems.

Reference excerpt

In enzymology, a polynucleotide 5'-hydroxyl-kinase (EC 2.7.1.78) is an enzyme that catalyzes the chemical reaction

ATP + 5'-dephospho-DNA ⇌ {\displaystyle \rightleftharpoons } ADP + 5'-phospho-DNA Thus, the two substrates of this enzyme are ATP and 5'-dephospho-DNA, whereas its two products are ADP and 5'-phospho-DNA. Polynucleotide kinase is a T7 bacteriophage (or T4 bacteriophage) enzyme that catalyzes the transfer of a gamma-phosphate from ATP to the free hydroxyl end of the 5' DNA or RNA. The resulting product could be used to end-label DNA or RNA, or in ligation reactions.

Nomenclature This enzyme belongs to the family of transferases, specifically those transferring phosphorus-containing groups (phosphotransferases) with an alcohol group as an acceptor. The systematic name of this enzyme class is ATP:5'-dephosphopolynucleotide 5'-phosphotransferase. Other names in common use include:

ATP:5'-dephosphopolynucleotide 5'-phosphatase PNK polynucleotide 5'-hydroxyl kinase (phosphorylating), 5'-hydroxyl polynucleotide kinase, 5'-hydroxyl polyribonucleotide kinase, 5'-hydroxyl RNA kinase, DNA 5'-hydroxyl kinase, DNA kinase, polynucleotide kinase, and polynucleotide 5'-hydroxy-kinase.

References

Novogrodsky A, Hurwitz J (1966). "The enzymatic phosphorylation of ribonucleic acid and deoxyribonucleic acid. I. Phosphorylation at 5'-hydroxyl termini". J. Biol. Chem. 241 (12): 2923–32. doi:10.1016/S0021-9258(18)96553-1. PMID 4287929. Novogrodsky A, Tal M, Traub A, Hurwitz J (1966). "The enzymatic phosphorylation of ribonucleic acid and deoxyribonucleic acid. II. Further properties of the 5'-hydroxyl polynucleotide kinase". J. Biol. Chem. 241 (12): 2933–43. doi:10.1016/S0021-9258(18)96554-3. PMID 4287930.

External links Vivo New England Biolabs' T4 PNK page

Worked examples

Example 1 — a first encounter with Polynucleotide 5'-hydroxyl-kinase

Start with the simplest possible case. Write down what Polynucleotide 5'-hydroxyl-kinase 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 Polynucleotide 5'-hydroxyl-kinase 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 Polynucleotide 5'-hydroxyl-kinase 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 Polynucleotide 5'-hydroxyl-kinase

In research: Polynucleotide 5'-hydroxyl-kinase 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 Polynucleotide 5'-hydroxyl-kinase 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: Polynucleotide 5'-hydroxyl-kinase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 2.7.1, EC 2.7 stubs, Enzymes of known structure, so understanding it makes those chapters shorter.
In everyday life: Look for Polynucleotide 5'-hydroxyl-kinase 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 Polynucleotide 5'-hydroxyl-kinase in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Polynucleotide 5'-hydroxyl-kinase 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.
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Frequently asked questions

What is Polynucleotide 5'-hydroxyl-kinase in simple terms?

In enzymology, a polynucleotide 5'-hydroxyl-kinase (EC 2.7.1.78) is an enzyme that catalyzes the chemical reaction ATP + 5'-dephospho-DNA ⇌ {\displaystyle \rightleftharpoons } ADP + 5'-phospho-DNA Thus, the two substrates of this enzyme are ATP and 5'-dephospho-DNA, whereas its two products are ADP…

Why does Polynucleotide 5'-hydroxyl-kinase 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 Polynucleotide 5'-hydroxyl-kinase?

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 Polynucleotide 5'-hydroxyl-kinase.