biology

Outer membrane efflux protein

Outer membrane efflux protein is a biology 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 Outer membrane efflux protein rather than just read about it. In short: The outer membrane efflux protein is a protein family member that forms trimeric (three-piece) channels allowing the export of a variety of substrates in gram-negative bacteria. Each efflux protein is composed of two repeats.

Key takeaways

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

Reference excerpt

The outer membrane efflux protein is a protein family member that forms trimeric (three-piece) channels allowing the export of a variety of substrates in gram-negative bacteria. Each efflux protein is composed of two repeats. The trimeric channel is composed of a 12-stranded beta-barrel that spans the outer membrane, and a long tail helical barrel that spans the periplasm. Examples include the Escherichia coli TolC outer membrane protein, which is required for proper expression of outer membrane protein genes; the Rhizobium nodulation protein; and the Pseudomonas FusA protein, which is involved in resistance to fusaric acid.

References Johnson JM, Church GM (April 1999). "Alignment and structure prediction of divergent protein families: periplasmic and outer membrane proteins of bacterial efflux pumps". Journal of Molecular Biology. 287 (3): 695–715. CiteSeerX 10.1.1.73.559. doi:10.1006/jmbi.1999.2630. PMID 10092468. {{cite journal}}: Cite uses deprecated parameter |citeseerx= (help)

Illustrations

Worked examples

Example 1 — a first encounter with Outer membrane efflux protein

Start with the simplest possible case. Write down what Outer membrane efflux protein claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Outer membrane efflux protein 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 Outer membrane efflux protein 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 Outer membrane efflux protein

In research: Outer membrane efflux protein appears in biology 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 Outer membrane efflux protein 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: Outer membrane efflux protein is common in secondary-school and first-year university syllabi. It links to neighbouring topics Membrane protein stubs, Outer membrane proteins, Protein domains, so understanding it makes those chapters shorter.
In everyday life: Look for Outer membrane efflux protein 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 Outer membrane efflux protein in 20 minutes

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

Frequently asked questions

What is Outer membrane efflux protein in simple terms?

Why does Outer membrane efflux protein matter?

Because it connects several biology 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 Outer membrane efflux protein?

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 Outer membrane efflux protein.