science

NdeI

NdeI 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 NdeI rather than just read about it. In short: NdeI is an endonuclease isolated from Neisseria denitrificans. In molecular biology, it is commonly used as a restriction enzyme.

Key takeaways

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

Reference excerpt

NdeI is an endonuclease isolated from Neisseria denitrificans. In molecular biology, it is commonly used as a restriction enzyme.

Recognition sequence Recognition sequence of NdeI:

5'CATATG 3'GTATAC

The ends generated by NdeI digest:

5'---CA TATG---3' 3'---GTAT AC---5'

Use in molecular biology NdeI is a specific Type II restriction enzyme that cuts open specific target sequences, unlike exonucleases. This enzyme is used in gene cloning to cut open reading frames in the plasmid of certain bacteria such as E. coli and insert a foreign gene, such as the gfpuv gene that codes for bio fluorescence of the jelly fish Aequorea victoria. NdeI is useful in generating heterologous DNA construct because it contains the start codon ATG. It therefore can be used in some expression vectors, such as those in the pET series of vectors, for the ligation of the start of a gene when making an expression construct. However, NdeI generates only a two-base overhang and therefore has a lower melting temperature than other restriction enzymes that generate a four-base overhang. It has a lower ligation efficiency, since ligation is affected by the ability of the ends to anneal and a two-base overhang has a significantly lower melting temperature compared to a 4-base overhang. Ligation of NdeI-generated ends is therefore best performed with higher ligase concentration with a longer ligation time, whether at room temperature, 14-16°C, or at 4°C.

References

Worked examples

Example 1 — a first encounter with NdeI

Start with the simplest possible case. Write down what NdeI 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 NdeI 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 NdeI 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 NdeI

In research: NdeI 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 NdeI 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: NdeI is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bacterial enzymes, Enzyme stubs, Restriction enzymes, so understanding it makes those chapters shorter.
In everyday life: Look for NdeI 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 NdeI in 20 minutes

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

Frequently asked questions

What is NdeI in simple terms?

NdeI is an endonuclease isolated from Neisseria denitrificans. In molecular biology, it is commonly used as a restriction enzyme.

Why does NdeI 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 NdeI?

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 NdeI.