engineering

Initiation-specific alpha-1,6-mannosyltransferase

Initiation-specific alpha-1,6-mannosyltransferase 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 Initiation-specific alpha-1,6-mannosyltransferase rather than just read about it. In short: In enzymology, an initiation-specific alpha-1,6-mannosyltransferase (EC 2.4.1.232) is an enzyme that catalyzes the chemical reaction in which an alpha-D-mannosyl residue is transferred from GDP-mannose to a lipid-linked oligosaccharide, being linked by an alpha-1,6-D-mannosyl-D-mannose bond. This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases.

Key takeaways

Initiation-specific alpha-1,6-mannosyltransferase belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Initiation-specific alpha-1,6-mannosyltransferase to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Initiation-specific alpha-1,6-mannosyltransferase from memory before moving on to harder problems.

Reference excerpt

In enzymology, an initiation-specific alpha-1,6-mannosyltransferase (EC 2.4.1.232) is an enzyme that catalyzes the chemical reaction in which an alpha-D-mannosyl residue is transferred from GDP-mannose to a lipid-linked oligosaccharide, being linked by an alpha-1,6-D-mannosyl-D-mannose bond. This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is GDP-mannose:oligosaccharide 1,6-alpha-D-mannosyltransferase. Other names in common use include alpha-1,6-mannosyltransferase, GDP-mannose:oligosaccharide 1,6-alpha-D-mannosyltransferase, GDP-mannose:glycolipid 1,6-alpha-D-mannosyltransferase, and glycolipid 6-alpha-mannosyltransferase. This enzyme participates in high-mannose type n-glycan biosynthesis.

References

Romero PA, Herscovics A (1989). "Glycoprotein biosynthesis in Saccharomyces cerevisiae Characterization of alpha-1,6-mannosyltransferase which initiates outer chain formation". J. Biol. Chem. 264 (4): 1946–50. doi:10.1016/S0021-9258(18)94125-6. PMID 2644248. Reason AJ, Dell A, Romero PA, Herscovics A (1991). "Specificity of the mannosyltransferase which initiates outer chain formation in Saccharomyces cerevisiae". Glycobiology. 1 (4): 387–91. doi:10.1093/glycob/1.4.387. PMID 1820199. Nakanishi-Shindo Y, Nakayama K, Tanaka A, Toda Y, Jigami Y (1993). "Structure of the N-linked oligosaccharides that show the complete loss of alpha-1,6-polymannose outer chain from och1, och1 mnn1, and och1 mnn1 alg3 mutants of Saccharomyces cerevisiae". J. Biol. Chem. 268 (35): 26338–45. doi:10.1016/S0021-9258(19)74320-8. PMID 8253757. Yamamoto K, Okamoto M, Yoko-o T, Jigami Y (2003). "Salt stress induces the expression of Schizosaccharomyces pombe och1+, which encodes an initiation-specific alpha-1,6-mannosyltransferase for N-linked outer chain synthesis of cell wall mannoproteins". Biosci. Biotechnol. Biochem. 67 (4): 927–9. doi:10.1271/bbb.67.927. PMID 12784644. Cui Z, Horecka J, Jigami Y (2002). "Cdc4 is involved in the transcriptional control of OCH1, a gene encoding alpha-1,6-mannosyltransferase in Saccharomyces cerevisiae". Yeast. 19 (1): 69–77. doi:10.1002/yea.801. PMID 11754484. S2CID 36308897. Tsukahara K, Watanabe T, Yoko-o T, Chigami Y (2001). "Schizosaccharomyces pombe och1+ gene encoding alpha-1,6-mannosyltransferase and use of och1+ gene knockout fission yeast for production of glycoproteins with reduced glycosylation". Jpn. Kokai Tokkyo Koho. Koho: 11. Nakayama K, Nakanishi-Shindo Y, Tanaka A, Haga-Toda Y, Jigami Y (1997). "Substrate specificity of alpha-1,6-mannosyltransferase that initiates N-linked mannose outer chain elongation in Saccharomyces cerevisiae". FEBS Lett. 412 (3): 547–50. Bibcode:1997FEBSL.412..547N. doi:10.1016/S0014-5793(97)00634-0. PMID 9276464. H, Kobayashi H, Suzuki S, Okawa Y (1996). "Characterization of alpha-1,6-mannosyltransferase responsible for the synthesis of branched side chains in Candida albicans mannan". Eur. J. Biochem. 240 (1): 37–44. doi:10.1111/j.1432-1033.1996.0037h.x. PMID 8797833.{{cite journal}}: CS1 maint: multiple names: authors list (link) MacKay VL; Welch, SK; Klebl, F; Gilbert, T; Seidel, P; Grant, FJ; O'Hara, PJ; MacKay, VL (1994). "Cloning and analysis of the Saccharomyces cerevisiae MNN9 and MNN1 genes required for complex glycosylation of secreted proteins". Proc. Natl. Acad. Sci. U.S.A. 91 (7): 2723–7. Bibcode:1994PNAS...91.2723Y. doi:10.1073/pnas.91.7.2723. PMC 43442. PMID 8146181.

Worked examples

Example 1 — a first encounter with Initiation-specific alpha-1,6-mannosyltransferase

Start with the simplest possible case. Write down what Initiation-specific alpha-1,6-mannosyltransferase 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 Initiation-specific alpha-1,6-mannosyltransferase 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 Initiation-specific alpha-1,6-mannosyltransferase 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 Initiation-specific alpha-1,6-mannosyltransferase

In research: Initiation-specific alpha-1,6-mannosyltransferase 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 Initiation-specific alpha-1,6-mannosyltransferase 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: Initiation-specific alpha-1,6-mannosyltransferase 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 unknown structure, so understanding it makes those chapters shorter.
In everyday life: Look for Initiation-specific alpha-1,6-mannosyltransferase 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 Initiation-specific alpha-1,6-mannosyltransferase in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Initiation-specific alpha-1,6-mannosyltransferase 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 Initiation-specific alpha-1,6-mannosyltransferase out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Initiation-specific alpha-1,6-mannosyltransferase in simple terms?

Why does Initiation-specific alpha-1,6-mannosyltransferase 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 Initiation-specific alpha-1,6-mannosyltransferase?

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 Initiation-specific alpha-1,6-mannosyltransferase.