biology

Guanidinoacetate N-methyltransferase

Guanidinoacetate N-methyltransferase 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 Guanidinoacetate N-methyltransferase rather than just read about it. In short: Guanidinoacetate N-methyltransferase (EC 2.1.1.2) is an enzyme that is encoded by gene GAMT located on chromosome 19p13.3 and catalyzes the chemical reaction: This is a methylation reaction in which glycocyamine is converted to creatine. The methyl group comes from the cofactor, S-adenosyl methionine (SAM), which loses its methyl group and becomes S-adenosyl-L-homocysteine (SAH).

Key takeaways

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Reference excerpt

Guanidinoacetate N-methyltransferase (EC 2.1.1.2) is an enzyme that is encoded by gene GAMT located on chromosome 19p13.3 and catalyzes the chemical reaction:

This is a methylation reaction in which glycocyamine is converted to creatine. The methyl group comes from the cofactor, S-adenosyl methionine (SAM), which loses its methyl group and becomes S-adenosyl-L-homocysteine (SAH). This enzyme belongs to the family of transferases, specifically those transferring one-carbon group methyltransferases. The systematic name of this enzyme class is S-adenosyl-L-methionine:N-guanidinoacetate methyltransferase. Other names in common use include GA methylpherase, guanidinoacetate methyltransferase, guanidinoacetate transmethylase, methionine-guanidinoacetic transmethylase, and guanidoacetate methyltransferase. It participates in the metabolism of amino acids. Defects in the gene which encodes this protein have been implicated in neurologic syndromes and muscular hypotonia, probably due to creatine deficiency and accumulation of guanidinoacetate in the brain of affected individuals. Two transcript variants encoding different isoforms have been described for this gene.

Structural studies As of late 2007, 7 structures have been solved for this class of enzymes, with PDB accession codes PDB: 1KHH, PDB: 1P1B, PDB: 1P1C, PDB: 1XCJ, PDB: 1XCL, PDB: 1ZX0, and PDB: 2BLN.

See also Guanidinoacetate methyltransferase deficiency

References

Illustrations

Worked examples

Example 1 — a first encounter with Guanidinoacetate N-methyltransferase

Start with the simplest possible case. Write down what Guanidinoacetate N-methyltransferase 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 Guanidinoacetate N-methyltransferase 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 Guanidinoacetate N-methyltransferase 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 Guanidinoacetate N-methyltransferase

In research: Guanidinoacetate N-methyltransferase 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 Guanidinoacetate N-methyltransferase 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: Guanidinoacetate N-methyltransferase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 2.1.1, Enzymes of known structure, Genes on human chromosome 19, so understanding it makes those chapters shorter.
In everyday life: Look for Guanidinoacetate N-methyltransferase 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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Frequently asked questions

What is Guanidinoacetate N-methyltransferase in simple terms?

Guanidinoacetate N-methyltransferase (EC 2.1.1.2) is an enzyme that is encoded by gene GAMT located on chromosome 19p13.3 and catalyzes the chemical reaction: This is a methylation reaction in which glycocyamine is converted to creatine. The methyl group comes from the cofactor, S-adenosyl methioni…

Why does Guanidinoacetate N-methyltransferase 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 Guanidinoacetate N-methyltransferase?

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 Guanidinoacetate N-methyltransferase.