engineering

Riboflavin kinase

Riboflavin 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 Riboflavin kinase rather than just read about it. In short: Riboflavin kinase (EC 2.7.1.26) is an enzyme that catalyzes the chemical reaction The enzyme originally characterised from plants and yeast converts the B vitamin, riboflavin, to flavin mononucleotide (FMN) by transferring a phosphate group from the cofactor, adenosine triphosphate (ATP), which is converted to adenosine diphosphate (ADP). Riboflavin is converted into catalytically active cofactors (FAD and FMN) by t…

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Reference excerpt

Riboflavin kinase (EC 2.7.1.26) is an enzyme that catalyzes the chemical reaction

The enzyme originally characterised from plants and yeast converts the B vitamin, riboflavin, to flavin mononucleotide (FMN) by transferring a phosphate group from the cofactor, adenosine triphosphate (ATP), which is converted to adenosine diphosphate (ADP). Riboflavin is converted into catalytically active cofactors (FAD and FMN) by the actions of riboflavin kinase, which converts it into FMN, and FAD synthetase (EC 2.7.7.2), which adenylates FMN to FAD. Eukaryotes usually have two separate enzymes, while most prokaryotes have a single bifunctional protein that can carry out both catalyses, although exceptions occur in both cases. While eukaryotic monofunctional riboflavin kinase is orthologous to the bifunctional prokaryotic enzyme, the monofunctional FAD synthetase differs from its prokaryotic counterpart, and is instead related to the PAPS-reductase family. The bacterial FAD synthetase that is part of the bifunctional enzyme has remote similarity to nucleotidyl transferases and, hence, it may be involved in the adenylylation reaction of FAD synthetases. 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:riboflavin 5'-phosphotransferase. This enzyme is also called flavokinase. However, archaeal riboflavin kinases (EC 2.7.1.161) in general utilize CTP rather than ATP as the donor nucleotide, catalyzing the reaction

CTP + riboflavin ⇌ {\displaystyle \rightleftharpoons } CDP + FMN Riboflavin kinase can also be isolated from other types of bacteria, all with similar function but a different number of amino acids.

Structure

The complete enzyme arrangement can be observed with X-ray crystallography and with NMR. The riboflavin kinase enzyme isolated from Thermoplasma acidophilum contains 220 amino acids. The structure of this enzyme has been determined X-ray crystallography at a resolution of 2.20 Å. Its secondary structure contains 69 residues (30%) in alpha helix form, and 60 residues (26%) a beta sheet conformation. The enzyme contains a magnesium binding site at amino acids 131 and 133, and a Flavin mononucleotide binding site at amino acids 188 and 195. As of late 2007, 14 structures have been solved for this class of enzymes, with PDB accession codes PDB: 1N05, PDB: 1N06, PDB: 1N07, PDB: 1N08, PDB: 1NB0, PDB: 1NB9, PDB: 1P4M, PDB: 1Q9S, PDB: 2P3M, PDB: 2VBS, PDB: 2VBT, PDB: 3CTA, PDB: 2VBU, and PDB: 2VBV.

References

Illustrations

Worked examples

Example 1 — a first encounter with Riboflavin kinase

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

In research: Riboflavin 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 Riboflavin 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: Riboflavin kinase 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 Riboflavin 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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Frequently asked questions

What is Riboflavin kinase in simple terms?

Riboflavin kinase (EC 2.7.1.26) is an enzyme that catalyzes the chemical reaction The enzyme originally characterised from plants and yeast converts the B vitamin, riboflavin, to flavin mononucleotide (FMN) by transferring a phosphate group from the cofactor, adenosine triphosphate (ATP), which is…

Why does Riboflavin 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 Riboflavin 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 Riboflavin kinase.