engineering

Glutathionylspermidine synthase

Glutathionylspermidine synthase is a engineering 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 Glutathionylspermidine synthase rather than just read about it. In short: In enzymology, a glutathionylspermidine synthase (EC 6.3.1.8) is an enzyme that catalyzes the chemical reaction glutathione + spermidine + ATP ⇌ {\displaystyle \rightleftharpoons } glutathionylspermidine + ADP + phosphate The 3 substrates of this enzyme are glutathione, spermidine, and ATP, whereas its 3 products are glutathionylspermidine, ADP, and phosphate. This enzyme belongs to the family of ligases, specifical…

Key takeaways

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

Reference excerpt

In enzymology, a glutathionylspermidine synthase (EC 6.3.1.8) is an enzyme that catalyzes the chemical reaction

glutathione + spermidine + ATP ⇌ {\displaystyle \rightleftharpoons } glutathionylspermidine + ADP + phosphate The 3 substrates of this enzyme are glutathione, spermidine, and ATP, whereas its 3 products are glutathionylspermidine, ADP, and phosphate. This enzyme belongs to the family of ligases, specifically those forming carbon-nitrogen bonds as acid-D-ammonia (or amine) ligases (amide synthases). The systematic name of this enzyme class is gamma-L-glutamyl-L-cysteinyl-glycine:spermidine ligase (ADP-forming) [spermidine is numbered so that atom N-1 is in the amino group of the aminopropyl part of the molecule]. This enzyme is also called glutathione:spermidine ligase (ADP-forming). This enzyme participates in glutathione metabolism. It employs one cofactor, magnesium.

Structural studies As of late 2007, 5 structures have been solved for this class of enzymes, with PDB accession codes PDB: 2IO7, PDB: 2IO8, PDB: 2IO9, PDB: 2IOA, and PDB: 2IOB.

References

Smith K, Nadeau K, Bradley M, Walsh C, Fairlamb AH (1992). "Purification of glutathionylspermidine and trypanothione synthetases from Crithidia fasciculata". Protein Sci. 1 (7): 874–83. doi:10.1002/pro.5560010705. PMC 2142158. PMID 1304372. Bollinger JM, Kwon DS, Huisman GW, Kolter R, Walsh CT (1995). "Glutathionylspermidine metabolism in Escherichia coli. Purification, cloning, overproduction, and characterization of a bifunctional glutathionylspermidine synthetase/amidase". J. Biol. Chem. 270 (23): 14031–41. doi:10.1074/jbc.270.23.14031. PMID 7775463.

Worked examples

Example 1 — a first encounter with Glutathionylspermidine synthase

Start with the simplest possible case. Write down what Glutathionylspermidine synthase claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, 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 Glutathionylspermidine synthase 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 Glutathionylspermidine synthase 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 Glutathionylspermidine synthase

In research: Glutathionylspermidine synthase appears in engineering 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 Glutathionylspermidine synthase 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: Glutathionylspermidine synthase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 6.3.1, Enzymes of known structure, Ligase stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Glutathionylspermidine synthase 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 Glutathionylspermidine synthase in simple terms?

In enzymology, a glutathionylspermidine synthase (EC 6.3.1.8) is an enzyme that catalyzes the chemical reaction glutathione + spermidine + ATP ⇌ {\displaystyle \rightleftharpoons } glutathionylspermidine + ADP + phosphate The 3 substrates of this enzyme are glutathione, spermidine, and ATP, whereas…

Why does Glutathionylspermidine synthase matter?

Because it connects several engineering 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 Glutathionylspermidine synthase?

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 Glutathionylspermidine synthase.