engineering

Xylulokinase

Xylulokinase 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 Xylulokinase rather than just read about it. In short: Xylulokinase (EC 2.7.1.17) is an enzyme that catalyzes the chemical reaction It was first characterised from Pasteurella pestis and Lactobacillus pentosus and converts the pentose sugar, D-xylulose, to D-xylulose 5-phosphate by transferring a phosphate group from the cofactor, adenosine triphosphate (ATP), which is converted to adenosine diphosphate (ADP). The enzyme is also found in mammalian liver, where it is an…

Key takeaways

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

Reference excerpt

Xylulokinase (EC 2.7.1.17) is an enzyme that catalyzes the chemical reaction

It was first characterised from Pasteurella pestis and Lactobacillus pentosus and converts the pentose sugar, D-xylulose, to D-xylulose 5-phosphate by transferring a phosphate group from the cofactor, adenosine triphosphate (ATP), which is converted to adenosine diphosphate (ADP). The enzyme is also found in mammalian liver, where it is an important component of carbohydrate metabolism. This enzyme is a transferase, specifically one transferring phosphorus-containing groups (phosphotransferases) with an alcohol group as acceptor. The systematic name of this enzyme class is ATP:D-xylulose 5-phosphotransferase. Other names in common use include xylulokinase (phosphorylating), and D-xylulokinase.

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

Applications

Hydrogen production In 2014 a low-temperature 50 °C (122 °F), atmospheric-pressure enzyme-driven process to convert xylose into hydrogen with nearly 100% of the theoretical yield was announced. The process employs 13 enzymes, including xylulokinase.

References

Illustrations

Worked examples

Example 1 — a first encounter with Xylulokinase

Start with the simplest possible case. Write down what Xylulokinase 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 Xylulokinase 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 Xylulokinase 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 Xylulokinase

In research: Xylulokinase 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 Xylulokinase 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: Xylulokinase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 2.7.1, Enzymes of known structure, so understanding it makes those chapters shorter.
In everyday life: Look for Xylulokinase 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 Xylulokinase in 20 minutes

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

Frequently asked questions

What is Xylulokinase in simple terms?

Xylulokinase (EC 2.7.1.17) is an enzyme that catalyzes the chemical reaction It was first characterised from Pasteurella pestis and Lactobacillus pentosus and converts the pentose sugar, D-xylulose, to D-xylulose 5-phosphate by transferring a phosphate group from the cofactor, adenosine triphosphat…

Why does Xylulokinase 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 Xylulokinase?

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 Xylulokinase.