engineering

Polo kinase

Polo kinase 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 Polo kinase rather than just read about it. In short: In enzymology, a polo kinase (EC 2.7.11.21) is a kinase enzyme i.e. one that catalyzes the chemical reaction ATP + a protein ⇌ {\displaystyle \rightleftharpoons } ADP + a phosphoprotein Thus, the two substrates of these enzymes are ATP and protein, whereas their two products are ADP and phosphoprotein. These enzymes belong to the family of transferases, specifically those transferring a phosphate group to the sidech…

Key takeaways

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

Reference excerpt

In enzymology, a polo kinase (EC 2.7.11.21) is a kinase enzyme i.e. one that catalyzes the chemical reaction

ATP + a protein ⇌ {\displaystyle \rightleftharpoons } ADP + a phosphoprotein Thus, the two substrates of these enzymes are ATP and protein, whereas their two products are ADP and phosphoprotein. These enzymes belong to the family of transferases, specifically those transferring a phosphate group to the sidechain oxygen atom of serine or threonine residues in proteins (protein-serine/threonine kinases). The systematic name of this [polo[-like] kinase] enzyme class is ATP:protein phosphotransferase (spindle-pole-dependent). Examples and other names in common use include Cdc5, Cdc5p, Plk, PLK, Plk1, Plo1, POLO kinase, polo serine-threonine kinase, polo-like kinase, polo-like kinase 1, serine/threonine-specific Drosophila kinase polo, and STK21. These enzymes participate in 3 metabolic pathways: cell cycle, cell cycle - yeast, and progesterone-mediated oocyte maturation.

Structural studies As of late 2007, 5 structures have been solved for this class of enzymes, with PDB accession codes PDB: 2OGQ, PDB: 2OJS, PDB: 2OJX, PDB: 2OU7, and PDB: 2OWB.

References

Llamazares, Moreira, Tavares, et al. (1991). "polo encodes a protein kinase homolog required for mitosis in Drosophila". Genes Dev. 5 (12A): 2153–65. doi:10.1101/gad.5.12a.2153. PMID 1660828. "Identification and cloning of a protein kinase-encoding mouse gene, Plk, related to the polo gene of Drosophila" 1993 Golsteyn RM, Mundt KE, Fry AM, Nigg EA (1995). "Cell cycle regulation of the activity and subcellular localization of Plk1, a human protein kinase implicated in mitotic spindle function". J. Cell Biol. 129 (6): 1617–28. doi:10.1083/jcb.129.6.1617. PMC 2291169. PMID 7790358. Mulvihill DP, Hyams JS (2002). "Cytokinetic actomyosin ring formation and septation in fission yeast are dependent on the full recruitment of the polo-like kinase Plo1 to the spindle pole body and a functional spindle assembly checkpoint". J. Cell Sci. 115 (Pt 18): 3575–86. doi:10.1242/jcs.00031. PMID 12186944. Ohkura H (2003). "Phosphorylation: polo kinase joins an elite club". Curr. Biol. 13 (23): R912–4. Bibcode:2003CBio...13.R912O. doi:10.1016/j.cub.2003.11.012. PMID 14654016. S2CID 12000886.

Worked examples

Example 1 — a first encounter with Polo kinase

Start with the simplest possible case. Write down what Polo kinase 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 Polo kinase 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 Polo kinase 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 Polo kinase

In research: Polo kinase 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 Polo kinase 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: Polo kinase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 2.7.11, EC 2.7 stubs, Enzymes of known structure, so understanding it makes those chapters shorter.
In everyday life: Look for Polo kinase 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 Polo kinase in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Polo kinase means in your own words.
Compare your version with the excerpt and mark what you missed.
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Frequently asked questions

What is Polo kinase in simple terms?

In enzymology, a polo kinase (EC 2.7.11.21) is a kinase enzyme i.e. one that catalyzes the chemical reaction ATP + a protein ⇌ {\displaystyle \rightleftharpoons } ADP + a phosphoprotein Thus, the two substrates of these enzymes are ATP and protein, whereas their two products are ADP and phosphoprot…

Why does Polo kinase 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 Polo kinase?

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 Polo kinase.