science

R.EcoRII

R.EcoRII 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 R.EcoRII rather than just read about it. In short: EcoRII (pronounced 'eco R two') is an Restriction endonuclease enzyme (REase) of the restriction modification system (RM) naturally found in Escherichia coli, a Gram-negative bacteria. Its molecular mass is 45.2 kDa, being composed of 402 amino acids.

Key takeaways

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

Reference excerpt

EcoRII (pronounced 'eco R two') is an Restriction endonuclease enzyme (REase) of the restriction modification system (RM) naturally found in Escherichia coli, a Gram-negative bacteria. Its molecular mass is 45.2 kDa, being composed of 402 amino acids.

Mode of action EcoRII is a bacterial Type IIE REase that interacts with two or three copies of the pseudopalindromic DNA recognition sequence 5'-CCWGG-3' (W = A or T), one being the actual target of cleavage, the other(s) serving as the allosteric activator(s). EcoRII cuts the target DNA sequence CCWGG, generating sticky ends.

Cut diagram

Structure

The apo crystal structure of EcoRII mutant R88A (PDB: 1NA6) has been solved at 2.1 Å resolution. The EcoRII monomer has two domains, N-terminal and C-terminal, linked through a hinge loop.

Effector-binding domain The N-terminal effector-binding domain has an archetypal DNA-binding pseudobarrel fold (SCOP 101936) with a prominent cleft. Structural superposition showed it is evolutionarily related to:

B3 DNA binding domain (SCOP 117343) from the transcription factors in higher plants (PDB: 1WID) C-terminal domain of restriction endonuclease BfiI (PDB: 2C1L)

Catalytic domain The C-terminal catalytic domain has a typical restriction endonuclease-like fold (SCOP 52979) and belongs to the large (more than 30 members) restriction endonuclease superfamily (SCOP 52980).

Autoinhibition/activation mechanism Structure-based sequence alignment and site-directed mutagenesis identified the putative PD..D/EXK active sites of the EcoRII catalytic domain dimer that in apo structure are spatially blocked by the N-terminal domains.

See also EcoRI, another nuclease enzyme from Escherichia coli. EcoRV, another nuclease enzyme from Escherichia coli. B3 DNA binding domain from higher plants is evolutionary related to EcoRII FokI, another nuclease enzyme from Flavobacterium okeanokoites

External links EcoRII in Restriction Enzyme Database REBASE

References

Illustrations

Worked examples

Example 1 — a first encounter with R.EcoRII

Start with the simplest possible case. Write down what R.EcoRII 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 R.EcoRII 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 R.EcoRII 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 R.EcoRII

In research: R.EcoRII 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 R.EcoRII 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: R.EcoRII is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bacterial enzymes, EC 3.1, EC 3.1.21, so understanding it makes those chapters shorter.
In everyday life: Look for R.EcoRII 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 R.EcoRII in 20 minutes

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

Frequently asked questions

What is R.EcoRII in simple terms?

Why does R.EcoRII 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 R.EcoRII?

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 R.EcoRII.