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Nucleotidyltransferase

Nucleotidyltransferase is a science 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 Nucleotidyltransferase rather than just read about it. In short: Nucleotidyltransferases are transferase enzymes of phosphorus-containing groups, e.g., substituents of nucleotidylic acids or simply nucleoside monophosphates. The general reaction of transferring a nucleoside monophosphate moiety from A to B, can be written as: A-P-N + B ⇌ {\displaystyle \rightleftharpoons } A + B-P-N For example, in the case of polymerases, A is pyrophosphate and B is the nascent polynucleotide.

Nucleotidyltransferase — main illustration
Nucleotidyltransferase — illustration

Key takeaways

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

Reference excerpt

Nucleotidyltransferases are transferase enzymes of phosphorus-containing groups, e.g., substituents of nucleotidylic acids or simply nucleoside monophosphates. The general reaction of transferring a nucleoside monophosphate moiety from A to B, can be written as:

A-P-N + B ⇌ {\displaystyle \rightleftharpoons } A + B-P-N For example, in the case of polymerases, A is pyrophosphate and B is the nascent polynucleotide. They are classified under EC number 2.7.7 and they can be categorised into:

Uridylyltransferases, which transfer uridylyl- groups Adenylyltransferases, which transfer adenylyl- groups Guanylyltransferases, which transfer guanylyl- groups Cytitidylyltransferases, which transfer cytidylyl- groups Thymidylyltransferases, which transfer thymidylyl- groups

Role in metabolism Many metabolic enzymes are modified by nucleotidyltransferases. The attachment of an AMP (adenylylation) or UMP (uridylylation) can activate or inactivate an enzyme or change its specificity (see figure). These modifications can lead to intricate regulatory networks that can finely tune enzymatic activities so that only the needed compounds are made (here: glutamine).

Role in DNA repair mechanisms Nucleotidyl transferase is a component of the repair pathway for single nucleotide base excision repair. This repair mechanism begins when a single nucleotide is recognized by DNA glycosylase as incorrectly matched or has been mutated in some way (UV light, chemical mutagen, etc.), and is removed. Later, a nucleotidyl transferase is used to fill in the gap with the correct base, using the template strand as the reference.

References

External links Nucleotidyltransferases at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

Illustrations

Nucleotidyltransferase: Regulation of bacterial glutamine synthase (GlnA) by adenylylation and (indirectly) by uridylylation. Uridylyltransferase (GlnD) uridylylates the regulatory PII protein (GlnB) which determines whether adenylyltransferase (GlnE) adenylylates or de-adenylylates glutamine synthase. GlnD is a bifunctional enzyme that both attaches and removes UMP from GlnB. GlnD is activated by α-ketoglutarate and ATP (green) but inhibited by glutamine and inorganic phosphate (Pi, in red). The protein names are those in E. coli. Homologs in other bacteria may have different names.[1]
Regulation of bacterial glutamine synthase (GlnA) by adenylylation and (indirectly) by uridylylation. Uridylyltransferase (GlnD) uridylylates the regulatory PII protein (GlnB) which determines whether adenylyltransferase (GlnE) adenylylates or de-adenylylates glutamine synthase. GlnD is a bifunctional enzyme that both attaches and removes UMP from GlnB. GlnD is activated by α-ketoglutarate and ATP (green) but inhibited by glutamine and inorganic phosphate (Pi, in red). The protein names are those in E. coli. Homologs in other bacteria may have different names.[1]

Worked examples

Example 1 — a first encounter with Nucleotidyltransferase

Start with the simplest possible case. Write down what Nucleotidyltransferase claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Nucleotidyltransferase 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 Nucleotidyltransferase 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 Nucleotidyltransferase

In research
Nucleotidyltransferase appears in science 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 Nucleotidyltransferase 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
Nucleotidyltransferase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 2.7.7, EC 2.7 stubs, Transferases, so understanding it makes those chapters shorter.
In everyday life
Look for Nucleotidyltransferase 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 Nucleotidyltransferase in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Nucleotidyltransferase means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Nucleotidyltransferase out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Nucleotidyltransferase in simple terms?

Nucleotidyltransferases are transferase enzymes of phosphorus-containing groups, e.g., substituents of nucleotidylic acids or simply nucleoside monophosphates. The general reaction of transferring a nucleoside monophosphate moiety from A to B, can be written as: A-P-N + B ⇌ {\displaystyle \rightlef…

Why does Nucleotidyltransferase matter?

Because it connects several science 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 Nucleotidyltransferase?

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 Nucleotidyltransferase.

Tags

  • EC 2.7.7
  • EC 2.7 stubs
  • Transferases

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