biology

Glucagon receptor

Glucagon 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 Glucagon receptor rather than just read about it. In short: The glucagon receptor is a 62 kDa protein that is activated by glucagon and is a member of the class B G-protein coupled family of receptors (secretin receptor family), coupled to Gs and to a lesser extent Gq, & potentially Gi. Stimulation of the Gs receptor results in the activation of adenylate cyclase, which in turn leads to increased levels of the secondary messengers intracellular cAMP and calcium.

Key takeaways

Glucagon 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 Glucagon receptor to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Glucagon receptor from memory before moving on to harder problems.

Reference excerpt

The glucagon receptor is a 62 kDa protein that is activated by glucagon and is a member of the class B G-protein coupled family of receptors (secretin receptor family), coupled to Gs and to a lesser extent Gq, & potentially Gi. Stimulation of the Gs receptor results in the activation of adenylate cyclase, which in turn leads to increased levels of the secondary messengers intracellular cAMP and calcium. In humans, the glucagon receptor is encoded by the GCGR gene. Glucagon receptors are mainly expressed in liver and in kidney with lesser amounts found in heart, adipose tissue, spleen, thymus, adrenal glands, pancreas, cerebral cortex, and gastrointestinal tract.

Signal transduction pathway A glucagon receptor, upon binding with the signaling molecule glucagon, initiates a signal transduction pathway that begins with the activation of adenylate cyclase, which in turn produces cyclic AMP (cAMP). Protein kinase A, whose activation is dependent on the increased levels of cAMP, is responsible for the ensuing cellular response in the form of protein kinase 1 and 2. The ligand-bound glucagon receptor can also initiate a concurrent signaling pathway that is independent of cAMP by activating phospholipase C. Phospholipase C produces DAG and IP3 from PIP2, a phospholipid phospholipase C cleaves off of the plasma membrane. Ca2+ stores inside the cell release Ca2+ when its calcium channels are bound by IP3.

Structure

The 3D crystallographic structures of the seven transmembrane helical domain (7TM) and the extracellular domain (ECD) and an electron microscopy (EM) map of full length glucagon receptor have been determined. Furthermore, the structural dynamics of an active state complex of the Glucagon receptor, Glucagon, the Receptor activity-modifying protein, and the G-protein C-terminus has been determined using a computational and experimental approach.

Clinical significance A missense mutation at 17q25 in the GCGR gene is associated with diabetes mellitus type 2. Inactivating mutation of glucagon receptor in humans causes resistance to glucagon and is associated with pancreatic alpha cell hyperplasia, nesidioblastosis, hyperglucagonemia, and pancreatic neuroendocrine tumors, also known as Mahvash disease.

References

Illustrations

Worked examples

Example 1 — a first encounter with Glucagon receptor

Start with the simplest possible case. Write down what Glucagon 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 Glucagon 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 Glucagon 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 Glucagon receptor

In research: Glucagon 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 Glucagon 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: Glucagon receptor is common in secondary-school and first-year university syllabi. It links to neighbouring topics G protein-coupled receptors, Genes on human chromosome 17, so understanding it makes those chapters shorter.
In everyday life: Look for Glucagon 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 Glucagon receptor in 20 minutes

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

Frequently asked questions

What is Glucagon receptor in simple terms?

Why does Glucagon 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 Glucagon 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 Glucagon receptor.