biology

Melanocortin 3 receptor

Melanocortin 3 receptor 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 Melanocortin 3 receptor rather than just read about it. In short: Melanocortin 3 receptor (MC3R) is a protein that in humans is encoded by the MC3R gene. Function This gene encodes MC3R, a G-protein coupled receptor (GPCR) for melanocyte-stimulating hormone (MSH) and adrenocorticotropic hormone (ACTH) that is expressed in the brain.

Key takeaways

Melanocortin 3 receptor belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Melanocortin 3 receptor to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Melanocortin 3 receptor from memory before moving on to harder problems.

Reference excerpt

Melanocortin 3 receptor (MC3R) is a protein that in humans is encoded by the MC3R gene.

Function This gene encodes MC3R, a G-protein coupled receptor (GPCR) for melanocyte-stimulating hormone (MSH) and adrenocorticotropic hormone (ACTH) that is expressed in the brain. Early research suggests that humans who carry loss-of-function mutations in MC3R may have a somewhat later onset of puberty (roughly 5 months later for heterozygous girls). This along with evidence from animal models has led some researchers to propose that MC3R may have a role in regulating the timing of sexual maturity.

Research Studies performed by the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), found that two specific polymorphisms in the MC3R gene may be associated with pediatric obesity and greater body mass because of greater energy intake. Children who were homozygous for C17A + G241A consumed approximately 38% more than those who did not contain aforementioned polymorphisms. The study concluded that these genetic variants did not affect energy expenditure.

Ligands Ac-Val-Gln-(pI)DPhe-DTic-NH2, first MC3 selective agonist, 100x selectivity over MC4. Ac-Val-Gln-DBip-DTic-NH2, 140x selectivity over MC4. Pyrrolidine bis-cyclic guanidines, non-peptide small molecule MC3 agonists, good selectivity over MC4 but not over MC1 or MC5. SHU-9119, mixed MC3/MC4 antagonist.

Evolution

Paralogue Source:

MC5R MC4R MC1R MC2R LPAR1 S1PR2 GPR12 S1PR1 GPR6 LPAR2 S1PR3 GPR3 GPR119 CNR1 LPAR3 S1PR5 S1PR4 CNR2

Illustrations

Worked examples

Example 1 — a first encounter with Melanocortin 3 receptor

Start with the simplest possible case. Write down what Melanocortin 3 receptor 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 Melanocortin 3 receptor 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 Melanocortin 3 receptor 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 Melanocortin 3 receptor

In research: Melanocortin 3 receptor 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 Melanocortin 3 receptor 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: Melanocortin 3 receptor is common in secondary-school and first-year university syllabi. It links to neighbouring topics G protein-coupled receptors, Genes on human chromosome 20, Human proteins, so understanding it makes those chapters shorter.
In everyday life: Look for Melanocortin 3 receptor 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 Melanocortin 3 receptor in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Melanocortin 3 receptor 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 Melanocortin 3 receptor out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Melanocortin 3 receptor in simple terms?

Melanocortin 3 receptor (MC3R) is a protein that in humans is encoded by the MC3R gene. Function This gene encodes MC3R, a G-protein coupled receptor (GPCR) for melanocyte-stimulating hormone (MSH) and adrenocorticotropic hormone (ACTH) that is expressed in the brain.

Why does Melanocortin 3 receptor 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 Melanocortin 3 receptor?

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 Melanocortin 3 receptor.