engineering

Ornithine cyclodeaminase

Ornithine cyclodeaminase 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 Ornithine cyclodeaminase rather than just read about it. In short: The enzyme ornithine cyclodeaminase (EC 4.3.1.12) catalyzes the chemical reaction This enzyme belongs to the family of lyases, specifically ammonia lyases, which cleave carbon-nitrogen bonds. The systematic name of this enzyme class is Lornithine ammonia-lyase (cyclizing; L-proline-forming).

Key takeaways

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

Reference excerpt

The enzyme ornithine cyclodeaminase (EC 4.3.1.12) catalyzes the chemical reaction

This enzyme belongs to the family of lyases, specifically ammonia lyases, which cleave carbon-nitrogen bonds. The systematic name of this enzyme class is Lornithine ammonia-lyase (cyclizing; L-proline-forming). Other names in common use include ornithine cyclase, ornithine cyclase (deaminating), and L-ornithine ammonia-lyase (cyclizing). This enzyme participates in arginine and proline biosynthesis. It employs one cofactor, NAD+.

Structural studies As of late 2007, two structures have been solved for this class of enzymes, with PDB accession codes PDB: 1U7H and PDB: 1X7D.

References

Costilow RN, Laycock L (1971). "Ornithine cyclase (deaminating). Purification of a protein that converts ornithine to proline and definition of the optimal assay conditions". Journal of Biological Chemistry. 246 (21): 6655–60. doi:10.1016/S0021-9258(19)34165-1. PMID 4399881. Muth WL, Costilow RN (1974). "Ornithine cyclase (deaminating). II. Properties of the homogeneous enzyme". Journal of Biological Chemistry. 249 (23): 7457–62. doi:10.1016/S0021-9258(19)81260-7. PMID 4373469. Espineda CE, Linford AS, Devine D, Brusslan JA (1999). "The AtCAO gene, encoding chlorophyll a oxygenase, is required for chlorophyll b synthesis in Arabidopsis thaliana". Proceedings of the National Academy of Sciences of the United States of America. 96 (18): 10507–11. Bibcode:1999PNAS...9610507E. doi:10.1073/pnas.96.18.10507. PMC 17919. PMID 10468639. Goodman JL, Wang S, Alam S, Ruzicka FJ, Frey PA, Wedekind JE (2004). "Ornithine cyclodeaminase: structure, mechanism of action, and implications for the mu-crystallin family". Biochemistry. 43 (44): 13883–91. doi:10.1021/bi048207i. PMID 15518536. Alam S, Wang SC, Ruzicka FJ, Frey PA, Wedekind JE (2004). "Crystallization and X-ray diffraction analysis of ornithine cyclodeaminase from Pseudomonas putida". Acta Crystallographica Section D. 60 (Pt 5): 941–4. doi:10.1107/S0907444904005256. PMID 15103146.

Illustrations

Worked examples

Example 1 — a first encounter with Ornithine cyclodeaminase

Start with the simplest possible case. Write down what Ornithine cyclodeaminase 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 Ornithine cyclodeaminase 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 Ornithine cyclodeaminase 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 Ornithine cyclodeaminase

In research: Ornithine cyclodeaminase 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 Ornithine cyclodeaminase 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: Ornithine cyclodeaminase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 4.3.1, Enzyme stubs, Enzymes of known structure, so understanding it makes those chapters shorter.
In everyday life: Look for Ornithine cyclodeaminase 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 Ornithine cyclodeaminase in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Ornithine cyclodeaminase 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 Ornithine cyclodeaminase out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Ornithine cyclodeaminase in simple terms?

The enzyme ornithine cyclodeaminase (EC 4.3.1.12) catalyzes the chemical reaction This enzyme belongs to the family of lyases, specifically ammonia lyases, which cleave carbon-nitrogen bonds. The systematic name of this enzyme class is Lornithine ammonia-lyase (cyclizing; L-proline-forming).

Why does Ornithine cyclodeaminase 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 Ornithine cyclodeaminase?

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 Ornithine cyclodeaminase.