biology

MCOLN3

MCOLN3 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 MCOLN3 rather than just read about it. In short: Mucolipin-3 also known as TRPML3 (transient receptor potential cation channel, mucolipin subfamily, member 3) is a protein that in humans is encoded by the MCOLN3 gene. It is a member of the small family of the TRPML channels, a subgroup of the large protein family of TRP ion channels.

Key takeaways

MCOLN3 belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect MCOLN3 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of MCOLN3 from memory before moving on to harder problems.

Reference excerpt

Mucolipin-3 also known as TRPML3 (transient receptor potential cation channel, mucolipin subfamily, member 3) is a protein that in humans is encoded by the MCOLN3 gene. It is a member of the small family of the TRPML channels, a subgroup of the large protein family of TRP ion channels.

Gene In human, the MCOLN3 gene resides on the short arm of chromosome 1 at 1p22.3. The gene is split in 12 exons, which entail the open reading frame of 1659 nucleotides. The encoded protein, TRPML3, has 553 amino acid with a predicted molecular weight of ≈64 kDa. Computational analyses of the secondary structure predict the presence of six transmembrane domains, an ion transport motif (PF00520) and a transient receptor potential motif (PS50272). In the mouse, Mcoln3, is located on the distal end of chromosome 3 at cytogenetic band qH2. Human and mouse TRPML3 proteins share 91% sequence identity. All vertebrate species, for which a genomic sequence is available, harbor the MCOLN3 gene. Homologs of MCOLN3 are also present in the genome of insects (Drosophila melanogaster), nematodes (Caenorhabditis elegans), sea urchin (Strongylocentrotus purpuratus) and lower organisms including Hydra and Dictyostelium.

Expression

Function TRPML3 is an inwardly-rectifying cation channel.

Genetics

Phenotypes Mutations of the MCOLN3 gene in mice result in auditory hair cell death and deafness.

Ligands Agonists (channel activators) ML-SA1 (non selective vs TRPML1) SN-2 (highly selective for TRPML3)

See also transient receptor potential cation channel, mucolipin subfamily, member 1 (MCOLN1) transient receptor potential cation channel, mucolipin subfamily, member 2 (MCOLN2)

References

Illustrations

Worked examples

Example 1 — a first encounter with MCOLN3

Start with the simplest possible case. Write down what MCOLN3 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 MCOLN3 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 MCOLN3 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 MCOLN3

In research: MCOLN3 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 MCOLN3 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: MCOLN3 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 1, Membrane protein stubs, so understanding it makes those chapters shorter.
In everyday life: Look for MCOLN3 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 MCOLN3 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what MCOLN3 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 MCOLN3 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is MCOLN3 in simple terms?

Why does MCOLN3 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 MCOLN3?

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 MCOLN3.