science

NatA acetyltransferase

NatA acetyltransferase 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 NatA acetyltransferase rather than just read about it. In short: NatA acetyltransferase(Nα acetyltransferase), is an enzyme that serves to catalyze the addition of acetyl groups to various proteins emerging from the ribosome. Upon translation, the NatA binds to the ribosome and then "stretches" to the front end of the forming, or nascent, polypeptide, where it adds this acetyl group.

Key takeaways

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

Reference excerpt

NatA acetyltransferase(Nα acetyltransferase), is an enzyme that serves to catalyze the addition of acetyl groups to various proteins emerging from the ribosome. Upon translation, the NatA binds to the ribosome and then "stretches" to the front end of the forming, or nascent, polypeptide, where it adds this acetyl group. This acetyl group is added to the front end, or N-terminus of the new protein. Forty percent of all proteins in the yeast proteome are thought to be N-terminally acetylated, with a corresponding figure of 90% in mammalian proteins. To be specific, NatA is the main N{alpha}-terminal acetyltransferase in the yeast cytosol, responsible for the acetylation of proteins at locations in which L-serine, L-alanine, L-threonine, or glycine are present. NatA Acetyltransferase is not a single protein but a complex of three subunits.

Sup35p acetylation In Saccharomyces cerevisiae NatA acetyltransferase interacts with the Sup35p protein. It is involved in the reaction of the [PSI+], converting the [psi-] to its own conformation. Thus, [PSI+] strains deficient in NatA Acetyltransferase have been found to have an altered interaction between Sup35p[PSI+] and nascent Sup35p. This interaction at the post-translational level still produces a prion with classical beta sheets, but this version of the interaction does not take away the function of this third release factor. Thus, stop codons are translated reliably in [PSI+] strains lacking NatA Acetyltransferase.

Subunits in yeast Naa10 (formerly Nat1p) – 27kDA, has catalytic properties which acetylate the nascent polypeptide. Naa15 (formerly Ard1p) – 98kDa, functions to bind to anchor onto the ribosome. Naa50 (formerly Nat5p) – Newly discovered, unknown function. Yeast cells lacking Naa15 and Naa10 show a reduced sporulation efficiency, failure to enter G0 phase under specific conditions, defect in silencing of the silent mating-type loci, and decreased survival after heat shock. However, strains lacking Naa50 do not show any obvious difference to the phenotype.

Comparisons Natp requires longer nascent polypeptide chains to function catalystically than NAC (nascent polypeptide-associated complex) and Hsp70 homologue Ssb1/2p.

References

Worked examples

Example 1 — a first encounter with NatA acetyltransferase

Start with the simplest possible case. Write down what NatA acetyltransferase 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 NatA acetyltransferase 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 NatA acetyltransferase 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 NatA acetyltransferase

In research: NatA acetyltransferase 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 NatA acetyltransferase 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: NatA acetyltransferase is common in secondary-school and first-year university syllabi. It links to neighbouring topics Enzymes, so understanding it makes those chapters shorter.
In everyday life: Look for NatA acetyltransferase 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 NatA acetyltransferase in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NatA acetyltransferase 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 NatA acetyltransferase out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NatA acetyltransferase in simple terms?

Why does NatA acetyltransferase 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 NatA acetyltransferase?

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 NatA acetyltransferase.