chemistry

Nocuolin A

Nocuolin A is a chemistry 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 Nocuolin A rather than just read about it. In short: Nocuolin A is a secondary metabolite derived from the cyanobacterium Nostoc sp., Nodularia sp., and Anabaena sp. This secondary metabolite is produced by enzymes of the noc biosynthetic gene group.

Key takeaways

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

Reference excerpt

Nocuolin A is a secondary metabolite derived from the cyanobacterium Nostoc sp., Nodularia sp., and Anabaena sp. This secondary metabolite is produced by enzymes of the noc biosynthetic gene group. Also, exhibits anticancer activity that may alter mitochondrial oxidative phosphorylation, thereby inducing antiproliferative effects and apoptosis. Its structure contains a 3-hydroxypropanoyl group, two alkyl chains, and a 1,2,3-oxadiazine core

History In 2017, Nocuolin A was isolated from the cyanobacterium strains Nostoc sp. CCAP 1453/38. Nocuolin A was purified using hydrophobic and high-performance countercurrent chromatography (HPCC) and semipreparative HPLC. Nocuolin A is notable for its antiproliferative, antifouling, anti-amoebic, antiparasitic, and anthelmintic activity. Its antiproliferative activity against tumor cells has an IC50 between 0.72 and 4.5 µM. Its antifouling activity inhibits marine organisms such as Mytilus galloprovincialis, preventing them from adhering to surfaces. It can also cause cell death in diatoms such as Navicula sp. The anti-amoebic activity of Nocuolin A induces encystment in Acanthamoeba castellanii (IC50: ~1.7 µM) and Dictyostelium discoideum (IC50: ~0.1 µM). Nocuolin A is effective against protozoa such as Trypanosoma brucei (IC50 = 3.99 µM) and Leishmania infantum (IC50 = 0.21 µM). Finally, its anthelmintic activity results in an inhibition of nematode development.

Mechanism of action The primary mechanism of action of Nocuolin A is the inhibition of mitochondrial oxidative phosphorylation (OXPHOS), which leads to decreased ATP production, induces metabolic stress, activates autophagy, and produces BCL-2 family-independent apoptosis. Nocuolin A also induces caspase-dependent apoptosis by activating caspase-3.

Biosynthesis

The biosynthesis of Nocuolin A is a hybrid fatty acid-derived biosynthesis, constructed from hexanoic acid, octanoic acid, and L-methionine. The first step is the activation of NocH (hexanoic acid and octanoic acid), which, from acyl-AMP, produces acyl-ACP. Next, a carbon-carbon bond is formed between hexanoic acid and octanoic acid by the enzyme NocG (ketosynthase), producing a C13 β-keto acid. A spontaneous decarboxylation then occurs, resulting in the loss of CO2 and the formation of a ketone intermediate. L-methionine interacts with the nitrogen to form 3-hydroxypropanoyl, and from this product, an oxadiazine ring is formed. Finally, Nocuolin A is produced and a chiral center was discovered in the structure whose absolute configuration is currently unknown.

In vitro studies In vitro studies have been conducted using cell models such as HCTII6 for colon cancer, MCF7 for breast cancer, and hTERT RPE-1, which are immortalized normal epithelial cells, to demonstrate their mechanism of action in OXPHOS inhibition. In vitro studies have also been performed using HeLa cells from cervical cancer, the A549 cell line from lung cancer, U251 and U87 glioma cells, and OVCAR5 ovarian cancer cells, demonstrating the mechanism of action of caspase-dependent apoptosis.

References

Illustrations

Worked examples

Example 1 — a first encounter with Nocuolin A

Start with the simplest possible case. Write down what Nocuolin A claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, 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 Nocuolin A 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 Nocuolin A 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 Nocuolin A

In research: Nocuolin A appears in chemistry 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 Nocuolin A 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: Nocuolin A is common in secondary-school and first-year university syllabi. It links to neighbouring topics Carboxamides, Heterocyclic compounds with 1 ring, Oxazines, so understanding it makes those chapters shorter.
In everyday life: Look for Nocuolin A 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 Nocuolin A in 20 minutes

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

Frequently asked questions

What is Nocuolin A in simple terms?

Nocuolin A is a secondary metabolite derived from the cyanobacterium Nostoc sp., Nodularia sp., and Anabaena sp. This secondary metabolite is produced by enzymes of the noc biosynthetic gene group.

Why does Nocuolin A matter?

Because it connects several chemistry 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 Nocuolin A?

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 Nocuolin A.