engineering

Phosphatidylinositol diacylglycerol-lyase

Phosphatidylinositol diacylglycerol-lyase 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 Phosphatidylinositol diacylglycerol-lyase rather than just read about it. In short: The enzyme phosphatidylinositol diacylglycerol-lyase (EC 4.6.1.13) catalyzes the following reaction: 1-phosphatidyl-1D-myo-inositol = 1D-myo-inositol 1,2-cyclic phosphate + 1,2-diacyl-sn-glycerol This enzyme belongs to the family of lyases, specifically the class of phosphorus-oxygen lyases. The systematic name of this enzyme class is 1-phosphatidyl-1D-myo-inositol 1,2-diacyl-sn-glycerol-lyase (1D-myo-inositol-1,2-c…

Key takeaways

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

Reference excerpt

The enzyme phosphatidylinositol diacylglycerol-lyase (EC 4.6.1.13) catalyzes the following reaction:

1-phosphatidyl-1D-myo-inositol = 1D-myo-inositol 1,2-cyclic phosphate + 1,2-diacyl-sn-glycerol This enzyme belongs to the family of lyases, specifically the class of phosphorus-oxygen lyases. The systematic name of this enzyme class is 1-phosphatidyl-1D-myo-inositol 1,2-diacyl-sn-glycerol-lyase (1D-myo-inositol-1,2-cyclic-phosphate-forming). Other names in common use include monophosphatidylinositol phosphodiesterase, phosphatidylinositol phospholipase C, 1-phosphatidylinositol phosphodiesterase, 1-phosphatidyl-D-myo-inositol inositolphosphohydrolase, (cyclic-phosphate-forming), 1-phosphatidyl-1D-myo-inositol diacylglycerol-lyase, and (1,2-cyclic-phosphate-forming). It participates in inositol phosphate metabolism.

Structural studies As of late 2007, two structures have been solved for this class of enzymes, with PDB accession codes PDB: 1T6M and PDB: 2OR2.

References

Allan D, Michell RH (1974). "Phosphatidylinositol cleavage catalysed by the soluble fraction from lymphocytes. Activity at pH5.5 and pH7.0". Biochem. J. 142 (3): 591–7. doi:10.1042/bj1420591. PMC 1168323. PMID 4377210. Friedel RO, Brown JD, Durell (1967). "Monophosphatidyl inositol inositolphosphohydrolase in guinea-pig brain". Biochim. Biophys. Acta. 144 (3): 684–6. doi:10.1016/0005-2760(67)90059-8. PMID 4294905. Irvine RF (1982). "The enzymology of stimulated inositol lipid turnover". Cell Calcium. 3 (4–5): 295–309. doi:10.1016/0143-4160(82)90018-5. PMID 6297738. Michell RH, Allan D (1975). "Inositol cyclis phosphate as a product of phosphatidylinositol breakdown by phospholipase C (Bacillus cereus)". FEBS Lett. 53 (3): 302–4. Bibcode:1975FEBSL..53..302M. doi:10.1016/0014-5793(75)80041-X. PMID 236918. S2CID 5813981. Low MG, Finean JB (1977). "Release of alkaline phosphatase from membranes by a phosphatidylinositol-specific phospholipase C". Biochem. J. 167 (1): 281–4. doi:10.1042/bj1670281. PMC 1183647. PMID 588258. Henner DJ, Yang M, Chen E, Hellmiss R, Rodriguez H, Low MG (1988). "Sequence of the Bacillus thuringiensis phosphatidylinositol specific phospholipase C". Nucleic Acids Res. 16 (21) 10383. doi:10.1093/nar/16.21.10383. PMC 338883. PMID 3194218.

Illustrations

Worked examples

Example 1 — a first encounter with Phosphatidylinositol diacylglycerol-lyase

Start with the simplest possible case. Write down what Phosphatidylinositol diacylglycerol-lyase 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 Phosphatidylinositol diacylglycerol-lyase 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 Phosphatidylinositol diacylglycerol-lyase 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 Phosphatidylinositol diacylglycerol-lyase

In research: Phosphatidylinositol diacylglycerol-lyase 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 Phosphatidylinositol diacylglycerol-lyase 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: Phosphatidylinositol diacylglycerol-lyase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 4.6.1, Enzyme stubs, Enzymes of known structure, so understanding it makes those chapters shorter.
In everyday life: Look for Phosphatidylinositol diacylglycerol-lyase 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 Phosphatidylinositol diacylglycerol-lyase in 20 minutes

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

Frequently asked questions

What is Phosphatidylinositol diacylglycerol-lyase in simple terms?

The enzyme phosphatidylinositol diacylglycerol-lyase (EC 4.6.1.13) catalyzes the following reaction: 1-phosphatidyl-1D-myo-inositol = 1D-myo-inositol 1,2-cyclic phosphate + 1,2-diacyl-sn-glycerol This enzyme belongs to the family of lyases, specifically the class of phosphorus-oxygen lyases. The sy…

Why does Phosphatidylinositol diacylglycerol-lyase 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 Phosphatidylinositol diacylglycerol-lyase?

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 Phosphatidylinositol diacylglycerol-lyase.