engineering

N-acetyllactosaminide alpha-2,3-sialyltransferase

N-acetyllactosaminide alpha-2,3-sialyltransferase 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 N-acetyllactosaminide alpha-2,3-sialyltransferase rather than just read about it. In short: In enzymology, a N-acetyllactosaminide alpha-2,3-sialyltransferase (EC 2.4.99.6) is an enzyme that catalyzes the chemical reaction CMP-N-acetylneuraminate + beta-D-galactosyl-1,4-N-acetyl-D-glucosaminyl-glycoprotein ⇌ {\displaystyle \rightleftharpoons } CMP + alpha-N-acetylneuraminyl-2,3-beta-D-galactosyl-1,4-N-acetyl-D- glucosaminyl-glycoprotein Thus, the two substrates of this enzyme are CMP-N-acetylneuraminate an…

Key takeaways

N-acetyllactosaminide alpha-2,3-sialyltransferase belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect N-acetyllactosaminide alpha-2,3-sialyltransferase to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of N-acetyllactosaminide alpha-2,3-sialyltransferase from memory before moving on to harder problems.

Reference excerpt

In enzymology, a N-acetyllactosaminide alpha-2,3-sialyltransferase (EC 2.4.99.6) is an enzyme that catalyzes the chemical reaction

CMP-N-acetylneuraminate + beta-D-galactosyl-1,4-N-acetyl-D-glucosaminyl-glycoprotein ⇌ {\displaystyle \rightleftharpoons } CMP + alpha-N-acetylneuraminyl-2,3-beta-D-galactosyl-1,4-N-acetyl-D- glucosaminyl-glycoprotein Thus, the two substrates of this enzyme are CMP-N-acetylneuraminate and beta-D-galactosyl-1,4-N-acetyl-D-glucosaminyl-glycoprotein, whereas its 3 products are CMP, alpha-N-acetylneuraminyl-2,3-beta-D-galactosyl-1,4-N-acetyl-D-, and glucosaminyl-glycoprotein. This enzyme belongs to the family of transferases, specifically those glycosyltransferases that do not transfer hexosyl or pentosyl groups. The systematic name of this enzyme class is CMP-N-acetylneuraminate:beta-D-galactosyl-1,4-N-acetyl-D-glucosaminy l-glycoprotein alpha-2,3-N-acetylneuraminyltransferase. Other names in common use include sialyltransferase, cytidine, monophosphoacetylneuraminate-beta-galactosyl(1-, >4)acetylglucosaminide alpha2->3-sialyltransferase, alpha2->3 sialyltransferase, and SiaT. This enzyme participates in 4 metabolic pathways: keratan sulfate biosynthesis, glycosphingolipid biosynthesis - lactoseries, glycan structures - biosynthesis 1, and glycan structures - biosynthesis 2.

Structural studies As of late 2007, two structures have been solved for this class of enzymes, with PDB accession codes PDB: 2EX0 and PDB: 2EX1.

References

Van den Eijnden DH, Schiphorst WE (1981). "Detection of beta-galactosyl(1 leads to 4)N-acetylglucosaminide alpha(2 leads to 3)-sialyltransferase activity in fetal calf liver and other tissues". J. Biol. Chem. 256 (7): 3159–62. doi:10.1016/S0021-9258(19)69581-5. PMID 7204397.

Worked examples

Example 1 — a first encounter with N-acetyllactosaminide alpha-2,3-sialyltransferase

Start with the simplest possible case. Write down what N-acetyllactosaminide alpha-2,3-sialyltransferase 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 N-acetyllactosaminide alpha-2,3-sialyltransferase 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 N-acetyllactosaminide alpha-2,3-sialyltransferase 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 N-acetyllactosaminide alpha-2,3-sialyltransferase

In research: N-acetyllactosaminide alpha-2,3-sialyltransferase 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 N-acetyllactosaminide alpha-2,3-sialyltransferase 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: N-acetyllactosaminide alpha-2,3-sialyltransferase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 2.4.99, EC 2.4 stubs, Enzymes of known structure, so understanding it makes those chapters shorter.
In everyday life: Look for N-acetyllactosaminide alpha-2,3-sialyltransferase 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 N-acetyllactosaminide alpha-2,3-sialyltransferase in 20 minutes

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Frequently asked questions

What is N-acetyllactosaminide alpha-2,3-sialyltransferase in simple terms?

In enzymology, a N-acetyllactosaminide alpha-2,3-sialyltransferase (EC 2.4.99.6) is an enzyme that catalyzes the chemical reaction CMP-N-acetylneuraminate + beta-D-galactosyl-1,4-N-acetyl-D-glucosaminyl-glycoprotein ⇌ {\displaystyle \rightleftharpoons } CMP + alpha-N-acetylneuraminyl-2,3-beta-D-gal…

Why does N-acetyllactosaminide alpha-2,3-sialyltransferase 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 N-acetyllactosaminide alpha-2,3-sialyltransferase?

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 N-acetyllactosaminide alpha-2,3-sialyltransferase.