biology

Glycine–tRNA ligase

Glycine–tRNA ligase 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 Glycine–tRNA ligase rather than just read about it. In short: Glycine–tRNA ligase also known as glycyl-tRNA synthetase is an enzyme that in humans is encoded by the GARS1 gene. Function This gene encodes glycyl-tRNA synthetase, one of the aminoacyl-tRNA synthetases that charge tRNAs with their cognate amino acids.

Key takeaways

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

Reference excerpt

Glycine–tRNA ligase also known as glycyl-tRNA synthetase is an enzyme that in humans is encoded by the GARS1 gene.

Function This gene encodes glycyl-tRNA synthetase, one of the aminoacyl-tRNA synthetases that charge tRNAs with their cognate amino acids. The encoded enzyme is an (alpha)2 dimer which belongs to the class II family of tRNA synthetases.

Reaction In enzymology, a glycine–tRNA ligase (EC 6.1.1.14) is an enzyme that catalyzes the chemical reaction

ATP + glycine + tRNAGly ⇌ {\displaystyle \rightleftharpoons } AMP + diphosphate + glycyl-tRNAGly The 3 substrates of this enzyme are ATP, glycine, and tRNAGly, whereas its 3 products are AMP, diphosphate, and glycyl-tRNAGly. This enzyme belongs to the family of ligases, to be specific those forming carbon–oxygen bonds in aminoacyl-tRNA and related compounds. The systematic name of this enzyme class is glycine:tRNAGly ligase (AMP-forming). Other names in common use include glycyl-tRNA synthetase, glycyl-transfer ribonucleate synthetase, glycyl-transfer RNA synthetase, glycyl-transfer ribonucleic acid synthetase, and glycyl translase. This enzyme participates in glycine, serine and threonine metabolism and aminoacyl-tRNA biosynthesis.

Interactions Glycyl-tRNA synthetase has been shown to interact with EEF1D. Mutant forms of the protein associated with peripheral nerve disease have been shown to aberrantly bind to the transmembrane receptor proteins neuropilin 1 and Trk receptors A-C.

Clinical relevance Glycyl-tRNA synthetase has been shown to be a target of autoantibodies in the human autoimmune diseases, polymyositis or dermatomyositis. The peripheral nerve diseases Charcot-Marie-Tooth disease type 2D (CMT2D) and distal spinal muscular atrophy type V (dSMA-V) have been liked to dominant mutations in GARS. CMT2D usually manifests during the teenage years, and results in muscle weakness predominantly in the hands and feet. Two mouse models of CMT2D have been used to better understand the disease, identifying that the disorder is caused by a toxic gain-of-function of the mutant glycine-tRNA ligase protein. The CMT2D mice display peripheral nerve axon degeneration and defective development and function of the neuromuscular junction.

References

Illustrations

Worked examples

Example 1 — a first encounter with Glycine–tRNA ligase

Start with the simplest possible case. Write down what Glycine–tRNA ligase 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 Glycine–tRNA ligase 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 Glycine–tRNA ligase 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 Glycine–tRNA ligase

In research: Glycine–tRNA ligase 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 Glycine–tRNA ligase 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: Glycine–tRNA ligase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 6.1.1, Enzymes of known structure, Genes on human chromosome 7, so understanding it makes those chapters shorter.
In everyday life: Look for Glycine–tRNA ligase 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 Glycine–tRNA ligase in 20 minutes

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

Frequently asked questions

What is Glycine–tRNA ligase in simple terms?

Glycine–tRNA ligase also known as glycyl-tRNA synthetase is an enzyme that in humans is encoded by the GARS1 gene. Function This gene encodes glycyl-tRNA synthetase, one of the aminoacyl-tRNA synthetases that charge tRNAs with their cognate amino acids.

Why does Glycine–tRNA ligase 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 Glycine–tRNA ligase?

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 Glycine–tRNA ligase.