engineering

Precorrin-8X methylmutase

Precorrin-8X methylmutase 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 Precorrin-8X methylmutase rather than just read about it. In short: In enzymology, a precorrin-8X methylmutase (EC 5.4.99.61) is an enzyme that catalyzes the chemical reaction precorrin-8X ⇌ {\displaystyle \rightleftharpoons } hydrogenobyrinate Hence, this enzyme has one substrate, precorrin 8X, and one product, hydrogenobyrinate. This enzyme belongs to the family of isomerases, specifically those intramolecular transferases transferring other groups.

Key takeaways

Precorrin-8X methylmutase belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Precorrin-8X methylmutase to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Precorrin-8X methylmutase from memory before moving on to harder problems.

Reference excerpt

In enzymology, a precorrin-8X methylmutase (EC 5.4.99.61) is an enzyme that catalyzes the chemical reaction

precorrin-8X ⇌ {\displaystyle \rightleftharpoons } hydrogenobyrinate Hence, this enzyme has one substrate, precorrin 8X, and one product, hydrogenobyrinate. This enzyme belongs to the family of isomerases, specifically those intramolecular transferases transferring other groups. The systematic name of this enzyme class is precorrin-8X 11,12-methylmutase. Other names in common use include precorrin isomerase, hydrogenobyrinic acid-binding protein and CobH. This enzyme is part of the biosynthetic pathway to cobalamin (vitamin B12) in aerobic bacteria.

See also Cobalamin biosynthesis

Structural studies As of late 2007, 6 structures have been solved for this class of enzymes, with PDB accession codes PDB: 1F2V, PDB: 1I1H, PDB: 1OU0, PDB: 1V9C, PDB: 2AFR, and PDB: 2AFV.

References

Blanche F; Couder, M; Famechon, A; Debussche, L; Cameron, B; Crouzet, J; Blanche, F (1992). "The final step in the biosynthesis of hydrogenobyrinic acid is catalyzed by the cobH gene product with precorrin-8x as the substrate". J. Bacteriol. 174 (3): 1043–9. doi:10.1128/JB.174.3.1043-1049.1992. PMC 206186. PMID 1732194. Roth JR, Lawrence JG, Rubenfield M, Kieffer-Higgins S, Church GM (1993). "Characterization of the cobalamin (vitamin B12) biosynthetic genes of Salmonella typhimurium". J. Bacteriol. 175 (11): 3303–16. doi:10.1128/jb.175.11.3303-3316.1993. PMC 204727. PMID 8501034. Stolowich NJ, Iida K, Scott AI (1992). "Expression of 9 Salmonella typhimurium enzymes for cobinamide synthesis. Identification of the 11-methyl and 20-methyl transferases of corrin biosynthesis". FEBS Lett. 301 (1): 73–8. Bibcode:1992FEBSL.301...73R. doi:10.1016/0014-5793(92)80213-Z. PMID 1451790. S2CID 20198692. Thibaut D, Debussche L (1990). "Genetic and sequence analysis of an 8.7-kilobase Pseudomonas denitrificans fragment carrying eight genes involved in transformation of precorrin-2 to cobyrinic acid". J. Bacteriol. 172 (10): 5980–90. doi:10.1128/JB.172.10.5980-5990.1990. PMC 526920. PMID 2211521.

Illustrations

Worked examples

Example 1 — a first encounter with Precorrin-8X methylmutase

Start with the simplest possible case. Write down what Precorrin-8X methylmutase 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 Precorrin-8X methylmutase 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 Precorrin-8X methylmutase 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 Precorrin-8X methylmutase

In research: Precorrin-8X methylmutase 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 Precorrin-8X methylmutase 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: Precorrin-8X methylmutase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 5.4.99, Enzymes of known structure, Isomerase stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Precorrin-8X methylmutase 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 Precorrin-8X methylmutase in simple terms?

In enzymology, a precorrin-8X methylmutase (EC 5.4.99.61) is an enzyme that catalyzes the chemical reaction precorrin-8X ⇌ {\displaystyle \rightleftharpoons } hydrogenobyrinate Hence, this enzyme has one substrate, precorrin 8X, and one product, hydrogenobyrinate. This enzyme belongs to the family…

Why does Precorrin-8X methylmutase 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 Precorrin-8X methylmutase?

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 Precorrin-8X methylmutase.