biology

N-ethylmaleimide sensitive fusion protein

N-ethylmaleimide sensitive fusion 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 N-ethylmaleimide sensitive fusion protein rather than just read about it. In short: N-ethylmaleimide-sensitive factor, also known as NSF or N-ethylmaleimide sensitive fusion proteins, is an enzyme which in humans is encoded by the NSF gene. Function NSF is a homohexameric AAA ATPase involved in membrane fusion.

Key takeaways

N-ethylmaleimide sensitive fusion 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 N-ethylmaleimide sensitive fusion protein to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of N-ethylmaleimide sensitive fusion protein from memory before moving on to harder problems.

Reference excerpt

N-ethylmaleimide-sensitive factor, also known as NSF or N-ethylmaleimide sensitive fusion proteins, is an enzyme which in humans is encoded by the NSF gene.

Function NSF is a homohexameric AAA ATPase involved in membrane fusion. NSF is ubiquitously found in the membrane of eukaryotic cells. It is a central component of the cellular machinery in the transfer of membrane vesicles from one membrane compartment to another. During this process, SNARE proteins on two joining membranes (usually a vesicle and a target membrane such as the plasma membrane) form a complex, with the α-helical domains of the SNAREs coiling around each other and forming a very stable four-helix bundle. As SNAREs intertwine, they pull the vesicle towards the target membrane, excluding water and promoting fusion of the vesicle with the target membrane. NSF unravels SNARE complexes once membrane fusion has occurred, using the hydrolysis of ATP as an energy source, allowing the dissociated SNAREs to be recycled for reuse in further rounds of membrane fusion. This proposal remains controversial, however. Recent work indicates that the ATPase function of NSF does not function in recycling of vesicles but rather functions in the act of fusing vesicles with the plasma membrane.

SNARE hypothesis Because neuronal function depends on the release of neurotransmitters at a synapse — a process in which synaptic vesicles fuse with the presynaptic membrane — NSF is a key synaptic component. Thus, conditional temperature-sensitive mutations in the Drosophila melanogaster gene for NSF lead to a comatose behaviour at the restrictive temperature (and hence the gene is called comatose), presumably because neuronal functions are blocked. In Dictyostelium discoideum amoebae, similar mutations lead to a cessation of cell movement at the restrictive temperature, indicating a role for intracellular membrane transport in migration. Another neuronal role for NSF is indicated by its direct binding to the GluR2 subunit of AMPA type glutamate receptors (which detect the neurotransmitter glutamate). This gives NSF a putative role in delivery and expression of AMPA receptors at the synapse. NSF was discovered by James Rothman and colleagues in 1987 while at Stanford University; they identified NSF after observing that a cytoplasmic factor, required for membrane fusions, was inactivated by treatment with N-ethylmaleimide. This assay enabled them to purify NSF.

Interactions N-ethylmaleimide sensitive fusion protein has been shown to interact with NAPA.

References

Illustrations

Worked examples

Example 1 — a first encounter with N-ethylmaleimide sensitive fusion protein

Start with the simplest possible case. Write down what N-ethylmaleimide sensitive fusion 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 N-ethylmaleimide sensitive fusion 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 N-ethylmaleimide sensitive fusion 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 N-ethylmaleimide sensitive fusion protein

In research: N-ethylmaleimide sensitive fusion 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 N-ethylmaleimide sensitive fusion 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: N-ethylmaleimide sensitive fusion protein is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 17, Human proteins, Proteins, so understanding it makes those chapters shorter.
In everyday life: Look for N-ethylmaleimide sensitive fusion 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 N-ethylmaleimide sensitive fusion protein in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what N-ethylmaleimide sensitive fusion protein means in your own words.
Compare your version with the excerpt and mark what you missed.
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Frequently asked questions

What is N-ethylmaleimide sensitive fusion protein in simple terms?

N-ethylmaleimide-sensitive factor, also known as NSF or N-ethylmaleimide sensitive fusion proteins, is an enzyme which in humans is encoded by the NSF gene. Function NSF is a homohexameric AAA ATPase involved in membrane fusion.

Why does N-ethylmaleimide sensitive fusion 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 N-ethylmaleimide sensitive fusion 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 N-ethylmaleimide sensitive fusion protein.