biology

Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase

Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 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 Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase rather than just read about it. In short: In enzymology, a galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase (EC 2.4.1.135) is an enzyme that catalyzes the chemical reaction UDP-glucuronate + 3-beta-D-galactosyl-4-beta-D-galactosyl-O-beta-D-xylosylprotein ⇌ {\displaystyle \rightleftharpoons } UDP + 3-beta-D-glucuronosyl-3-beta-D-galactosyl-4-beta-D-galactosyl-O- beta-D-xylosylprotein Thus, the two substrates of this enzyme are UDP-glucuronat…

Key takeaways

Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase from memory before moving on to harder problems.

Reference excerpt

In enzymology, a galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase (EC 2.4.1.135) is an enzyme that catalyzes the chemical reaction

UDP-glucuronate + 3-beta-D-galactosyl-4-beta-D-galactosyl-O-beta-D-xylosylprotein ⇌ {\displaystyle \rightleftharpoons } UDP + 3-beta-D-glucuronosyl-3-beta-D-galactosyl-4-beta-D-galactosyl-O- beta-D-xylosylprotein Thus, the two substrates of this enzyme are UDP-glucuronate and 3-beta-D-galactosyl-4-beta-D-galactosyl-O-beta-D-xylosylprotein, whereas its 3 products are UDP, 3-beta-D-glucuronosyl-3-beta-D-galactosyl-4-beta-D-galactosyl-O-, and beta-D-xylosylprotein. This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is UDP-glucuronate:3-beta-D-galactosyl-4-beta-D-galactosyl-O-beta-D-xyl osyl-protein D-glucuronosyltransferase. Other names in common use include glucuronosyltransferase I, and uridine diphosphate glucuronic acid:acceptor glucuronosyltransferase. This enzyme participates in chondroitin sulfate biosynthesis and glycan structures - biosynthesis 1. It employs one cofactor, manganese.

Structural studies As of late 2007, 4 structures have been solved for this class of enzymes, with PDB accession codes PDB: 1V82, PDB: 1V83, PDB: 1V84, and PDB: 2D0J.

References

Helting T, Roden L (1969). "Biosynthesis of chondroitin sulfate. II. Glucuronosyl transfer in the formation of the carbohydrate-protein linkage region". J. Biol. Chem. 244 (10): 2799–805. doi:10.1016/S0021-9258(18)83465-2. PMID 5770003. Helting T (1972). "Biosynthesis of heparin. Solubilization and partial purification of uridine diphosphate glucuronic acid: acceptor glucuronosyltransferase from mouse mastocytoma". J. Biol. Chem. 247 (13): 4327–32. doi:10.1016/S0021-9258(19)45079-5. PMID 4260846. T, Sugahara K; Tone, Y; Tamura, J; Neumann, KW; Ogawa, T; Oka, S; Kawasaki, T; Sugahara, K (1998). "Molecular cloning and expression of glucuronyltransferase I involved in the biosynthesis of the glycosaminoglycan-protein linkage region of proteoglycans". J. Biol. Chem. 273 (12): 6615–8. doi:10.1074/jbc.273.12.6615. PMID 9506957.

Illustrations

Worked examples

Example 1 — a first encounter with Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase

Start with the simplest possible case. Write down what Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 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 Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 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 Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 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 Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase

In research: Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 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 Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 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: Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 2.4.1, EC 2.4 stubs, Enzymes of known structure, so understanding it makes those chapters shorter.
In everyday life: Look for Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 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 Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase in 20 minutes

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Frequently asked questions

What is Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase in simple terms?

In enzymology, a galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase (EC 2.4.1.135) is an enzyme that catalyzes the chemical reaction UDP-glucuronate + 3-beta-D-galactosyl-4-beta-D-galactosyl-O-beta-D-xylosylprotein ⇌ {\displaystyle \rightleftharpoons } UDP + 3-beta-D-glucuronosyl-3-b…

Why does Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 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 Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase?

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 Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase.