chemistry

Salinomycin

Salinomycin 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 Salinomycin rather than just read about it. In short: Salinomycin is an antibacterial and coccidiostat ionophore therapeutic drug. It is widely researched for its anticancer stem cell properties.

Key takeaways

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

Reference excerpt

Salinomycin is an antibacterial and coccidiostat ionophore therapeutic drug. It is widely researched for its anticancer stem cell properties. Salinomycin is also known to isomerise in solution. This unique property complicates its structural elucidation studies in areas such as analytical chemistry and pharmaceutical development. Mass spectrometry is the primary research technique in the analysis of polyether ionophores such as salinomycin. Different salinomycin isomers can generate unique sets of product ions in the mass spectrometer. A complete structural characterisation and fragmentation pathways for salinomycin and its isomers is important in understanding its fragmentation behaviour and provides firm ground for its future clinical drug discovery research.

Antibacterial activity Salinomycin and its derivatives exhibit high antimicrobial activity against Gram-positive bacteria, including the most problematic bacteria strains such as methicillin-resistant Staphylococcus aureus and methicillin-resistant Staphylococcus epidermidis, and Mycobacterium tuberculosis. Salinomycin is inactive against fungi such as Candida and Gram-negative bacteria.

Cancer research

Pre-clinical Salinomycin has been shown by Piyush Gupta et al. of the Massachusetts Institute of Technology and the Broad Institute to kill breast cancer stem cells in mice at least 100 times more effectively than the anti-cancer drug paclitaxel. The study screened 16,000 different chemical compounds and found that only a small subset, including salinomycin and etoposide, targeted cancer stem cells responsible for metastasis and relapse. The mechanism of action by which salinomycin kills cancer stem cells involves lysosomal iron sequestration, leading to the production of reactive oxygen species, lysosome membrane permeabilization and ferroptosis. Studies performed in 2011 showed that salinomycin could induce apoptosis of human cancer cells at higher concentrations. C20 amino derivatives such as ironomycin have shown to be more potent in vitro models of persister cancer cells and in vivo doi:10.1038/nchem.2778. Promising results from a few clinical pilot studies reveal that salinomycin is able to effectively eliminate cancer stem cells and to induce partial clinical regression of heavily pretreated and therapy-resistant cancers. The ability of salinomycin to kill both cancer stem cells and therapy-resistant cancer cells (persister) may define the compound as a novel and an effective anticancer drug. It has been also shown that salinomycin and its derivatives exhibit potent antiproliferative activity against the drug-resistant cancer cell lines. Salinomycin is the key compound in the pharmaceutical company Verastem's efforts to produce an anti-cancer-stem-cell drug.

Use in agriculture Salinomycin is used in chicken feed as a coccidiostat. Coccidiosis is a parasitic disease when farm animals are kept in area contaminated with coccidia oocysts. The parasite destructs the intestinal cells of the host animals, causing malnutrition which leads to higher mortality rates and poorer meat quality. Salinomycin acts by forming lipid-soluble complexes with alkali metal cations, results in cell death by disruption to the osmotic balance across the cell membrane.

Biosynthesis A team from the University of Cambridge has cloned and sequenced the biosynthetic cluster responsible for salinomycin production, from Streptomyces albus DSM 41398. This has shown that the polyketide backbone of salinomycin is synthesised on an assembly line of nine polyketide synthase) multienzymes. Furthermore, the cluster contains genes involved in oxidative cyclization including salC (epoxidase) and salBI/BII/BIII (epoxide hydrolase) genes. The cluster also contains genes suspected to be involved in self-resistance, export, precursor supply and regulation. The cluster contains a Non-Ribosomal Peptide Synthetase (NRPS) like carrier protein, SalX, that is suspected to tether “pre-salinomycin” during oxidative cyclization. By inactivating salC the researchers have demonstrated that salinomycin biosynthesis proceeds via a diene intermediate.

See also Narasin a derivative of salinomycin which has an additional methyl group. Targeted therapy

References

Illustrations

Worked examples

Example 1 — a first encounter with Salinomycin

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

In research: Salinomycin 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 Salinomycin 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: Salinomycin is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alcohols, Antibiotics, Antiparasitic agents, so understanding it makes those chapters shorter.
In everyday life: Look for Salinomycin 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 Salinomycin in 20 minutes

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

Frequently asked questions

What is Salinomycin in simple terms?

Salinomycin is an antibacterial and coccidiostat ionophore therapeutic drug. It is widely researched for its anticancer stem cell properties.

Why does Salinomycin 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 Salinomycin?

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 Salinomycin.