biology

Protein geranylgeranyltransferase type I

Protein geranylgeranyltransferase type I 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 Protein geranylgeranyltransferase type I rather than just read about it. In short: In enzymology, a protein geranylgeranyltransferase type I (EC 2.5.1.59) is an enzyme that catalyzes the chemical reaction geranylgeranyl diphosphate + protein-cysteine ⇌ {\displaystyle \rightleftharpoons } S-geranylgeranyl-protein + diphosphate Thus, the two substrates of this enzyme are geranylgeranyl diphosphate and protein-cysteine, whereas its two products are S-geranylgeranyl-protein and diphosphate. This enzym…

Key takeaways

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

Reference excerpt

In enzymology, a protein geranylgeranyltransferase type I (EC 2.5.1.59) is an enzyme that catalyzes the chemical reaction

geranylgeranyl diphosphate + protein-cysteine ⇌ {\displaystyle \rightleftharpoons } S-geranylgeranyl-protein + diphosphate Thus, the two substrates of this enzyme are geranylgeranyl diphosphate and protein-cysteine, whereas its two products are S-geranylgeranyl-protein and diphosphate. This enzyme belongs to the family of transferases, specifically those transferring aryl or alkyl groups other than methyl groups. The systematic name of this enzyme class is geranylgeranyl-diphosphate:protein-cysteine geranyltransferase. Other names in common use include GGTase-I, and GGTaseI.

Structural studies As of late 2007, 17 structures have been solved for this class of enzymes, with PDB accession codes PDB: 1S63, PDB: 1S64, PDB: 1SA4, PDB: 1SA5, PDB: 1TNB, PDB: 1TNO, PDB: 1TNU, PDB: 1TNY, PDB: 1TNZ, PDB: 1X81, PDB: 2BED, PDB: 2F0Y, PDB: 2H6F, PDB: 2H6G, PDB: 2H6H, PDB: 2H6I, and PDB: 2IEJ.

References

Casey PJ, Seabra MC (1996). "Protein prenyltransferases". J. Biol. Chem. 271 (10): 5289–92. doi:10.1074/jbc.271.10.5289. PMID 8621375. Zhang FL, Casey PJ (1996). "Influence of metal ions on substrate binding and catalytic activity of mammalian protein geranylgeranyltransferase type-I". Biochem. J. 320 (Pt 3): 925–32. doi:10.1042/bj3200925. PMC 1218017. PMID 9003382. Sinnott, M. (Ed.), Comprehensive Biological Catalysis. A Mechanistic Reference, vol. 1, Academic Press, San Diego, CA, 1998, p. 31-118.

Worked examples

Example 1 — a first encounter with Protein geranylgeranyltransferase type I

Start with the simplest possible case. Write down what Protein geranylgeranyltransferase type I 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 Protein geranylgeranyltransferase type I 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 Protein geranylgeranyltransferase type I 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 Protein geranylgeranyltransferase type I

In research: Protein geranylgeranyltransferase type I 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 Protein geranylgeranyltransferase type I 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: Protein geranylgeranyltransferase type I is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 2.5.1, Enzymes of known structure, Transferase stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Protein geranylgeranyltransferase type I 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 Protein geranylgeranyltransferase type I in simple terms?

In enzymology, a protein geranylgeranyltransferase type I (EC 2.5.1.59) is an enzyme that catalyzes the chemical reaction geranylgeranyl diphosphate + protein-cysteine ⇌ {\displaystyle \rightleftharpoons } S-geranylgeranyl-protein + diphosphate Thus, the two substrates of this enzyme are geranylger…

Why does Protein geranylgeranyltransferase type I 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 Protein geranylgeranyltransferase type I?

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 Protein geranylgeranyltransferase type I.