engineering

N-acetyllactosaminide 3-alpha-galactosyltransferase

N-acetyllactosaminide 3-alpha-galactosyltransferase 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 3-alpha-galactosyltransferase rather than just read about it. In short: In enzymology, a N-acetyllactosaminide 3-alpha-galactosyltransferase (EC 2.4.1.87) is an enzyme that catalyzes the chemical reaction UDP-galactose + beta-D-galactosyl-(1->4)-beta-N-acetyl-D-glucosaminyl-R ⇌ {\displaystyle \rightleftharpoons } UDP + alpha-D-galactosyl-(1->3)-beta-D-galactosyl-(1->4)-beta-N- acetylglucosaminyl-R Thus, the two substrates of this enzyme are UDP-galactose and [[beta-D-galactosyl-(1->4)-b…

Key takeaways

N-acetyllactosaminide 3-alpha-galactosyltransferase 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 3-alpha-galactosyltransferase to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of N-acetyllactosaminide 3-alpha-galactosyltransferase from memory before moving on to harder problems.

Reference excerpt

In enzymology, a N-acetyllactosaminide 3-alpha-galactosyltransferase (EC 2.4.1.87) is an enzyme that catalyzes the chemical reaction

UDP-galactose + beta-D-galactosyl-(1->4)-beta-N-acetyl-D-glucosaminyl-R ⇌ {\displaystyle \rightleftharpoons } UDP + alpha-D-galactosyl-(1->3)-beta-D-galactosyl-(1->4)-beta-N- acetylglucosaminyl-R Thus, the two substrates of this enzyme are UDP-galactose and [[beta-D-galactosyl-(1->4)-beta-N-acetyl-D-glucosaminyl-R]], whereas its 3 products are UDP, [[alpha-D-galactosyl-(1->3)-beta-D-galactosyl-(1->4)-beta-N-]], and acetylglucosaminyl-R. This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is UDP-galactose:N-acetyllactosaminide 3-alpha-D-galactosyltransferase. Other names in common use include alpha-galactosyltransferase, UDP-Gal:beta-D-Gal(1,4)-D-GlcNAc alpha(1,3)-galactosyltransferase, UDP-Gal:N-acetyllactosaminide alpha(1,3)-galactosyltransferase, UDP-Gal:N-acetyllactosaminide alpha-1,3-D-galactosyltransferase, UDP-Gal:Galbeta1->4GlcNAc-R alpha1->3-galactosyltransferase, UDP-galactose-acetyllactosamine alpha-D-galactosyltransferase, UDPgalactose:beta-D-galactosyl-beta-1,4-N-acetyl-D-glucosaminyl-, glycopeptide alpha-1,3-D-galactosyltransferase, glucosaminylglycopeptide alpha-1,3-galactosyltransferase, uridine diphosphogalactose-acetyllactosamine, alpha1->3-galactosyltransferase, uridine diphosphogalactose-acetyllactosamine galactosyltransferase, uridine, diphosphogalactose-, galactosylacetylglucosaminylgalactosylglucosylceramide, galactosyltransferase, beta-D-galactosyl-N-acetylglucosaminylglycopeptide, and alpha-1,3-galactosyltransferase. This enzyme participates in 3 metabolic pathways: glycosphingolipid biosynthesis - lactoseries, glycosphingolipid biosynthesis - neo-lactoseries, and glycan structures - biosynthesis 2.

Structural studies As of late 2007, 3 structures have been solved for this class of enzymes, with PDB accession codes PDB: 2JCF, PDB: 2JCK, and PDB: 2JCL.

References

Basu M, Basu S (1973). "Enzymatic synthesis of a blood group B-related pentaglycosylceramide by an alpha-galactosyltransferase from rabbit bone marrow". J. Biol. Chem. 248 (5): 1700–6. doi:10.1016/S0021-9258(19)44247-6. PMID 4632915. Blanken WM, Van den Eijnden DH (1985). "Biosynthesis of terminal Gal alpha 1--3Gal beta 1--4GlcNAc-R oligosaccharide sequences on glycoconjugates. Purification and acceptor specificity of a UDP-Gal:N-acetyllactosaminide alpha 1--3-galactosyltransferase from calf thymus". J. Biol. Chem. 260 (24): 12927–34. doi:10.1016/S0021-9258(17)38814-2. PMID 3932335. Blake DA, Goldstein IJ (1981). "An alpha-D-galactosyltransferase activity in Ehrlich ascites tumor cells. Biosynthesis and characterization of a trisaccharide (alpha-D-galactose-(1 goes to 3)-N-acetyllactosamine)". J. Biol. Chem. 256 (11): 5387–93. doi:10.1016/S0021-9258(19)69212-4. PMID 6787040.

Worked examples

Example 1 — a first encounter with N-acetyllactosaminide 3-alpha-galactosyltransferase

Start with the simplest possible case. Write down what N-acetyllactosaminide 3-alpha-galactosyltransferase 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 3-alpha-galactosyltransferase 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 3-alpha-galactosyltransferase 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 3-alpha-galactosyltransferase

In research: N-acetyllactosaminide 3-alpha-galactosyltransferase 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 3-alpha-galactosyltransferase 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 3-alpha-galactosyltransferase 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 N-acetyllactosaminide 3-alpha-galactosyltransferase 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 3-alpha-galactosyltransferase in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what N-acetyllactosaminide 3-alpha-galactosyltransferase 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 N-acetyllactosaminide 3-alpha-galactosyltransferase out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is N-acetyllactosaminide 3-alpha-galactosyltransferase in simple terms?

In enzymology, a N-acetyllactosaminide 3-alpha-galactosyltransferase (EC 2.4.1.87) is an enzyme that catalyzes the chemical reaction UDP-galactose + beta-D-galactosyl-(1->4)-beta-N-acetyl-D-glucosaminyl-R ⇌ {\displaystyle \rightleftharpoons } UDP + alpha-D-galactosyl-(1->3)-beta-D-galactosyl-(1->4)…

Why does N-acetyllactosaminide 3-alpha-galactosyltransferase 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 3-alpha-galactosyltransferase?

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 3-alpha-galactosyltransferase.