chemistry

Prenylated flavin mononucleotide

Prenylated flavin mononucleotide is a chemistry 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 Prenylated flavin mononucleotide rather than just read about it. In short: Prenylated flavin mononucleotide (prFMN) is a cofactor biosynthesized by the flavin prenyltransferase UbiX and used by UbiD enzymes for reversible decarboxylation reactions. Hence, prFMN is pivotal for catalysis in the ubiquitous microbial UbiD/X system. prFMN is flavin prenylated at the N5 and C6 positions resulting in the formation of a fourth non-aromatic ring. prFMN was discovered in 2015 at the University of Ma…

Key takeaways

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

Reference excerpt

Prenylated flavin mononucleotide (prFMN) is a cofactor biosynthesized by the flavin prenyltransferase UbiX and used by UbiD enzymes for reversible decarboxylation reactions. Hence, prFMN is pivotal for catalysis in the ubiquitous microbial UbiD/X system. prFMN is flavin prenylated at the N5 and C6 positions resulting in the formation of a fourth non-aromatic ring. prFMN was discovered in 2015 at the University of Manchester by David Leys' group.

Two studies in 2015 characterized UbiX as a flavin prenyltransferase, supplying prFMN to UbiD/Fdc1 which utilises the cofactor to catalyse a reversible decarboxylation reaction. Ferulic acid decarboxylase (Fdc1) from A. niger co-expressed in E. coli with UbiX from E. coli (AnFdc1UbiX) once purified had clear spectral differences to singly expressed AnFdc1, and was capable of in vitro decarboxylation of a range of aromatic carboxylic acids. The atomic resolution of the crystal structure of AnFdc1UbiX, allowed elucidation of the structure of the modified FMN cofactor classified as prFMN. The crystal structure revealed an isopentenyl-adduct to the N5-C6 of FMN, with the modifications branched nature and the position of the covalent linkages with flavin suggesting prenylation.

PrFMNOx UbiD activation by UbiX/prFMN was found to be dependent on oxygen suggesting that the reduced prFMN product of UbiX is oxidised to the catalytically relevant form. Several variations of the oxidised prFMN (prFMNox) cofactor were observed: prFMNiminium, hydroxylated prFMNiminium and prFMNketimine. Determination of the prFMN isomer that was catalytically relevant involved incubation of AnFdc1UbiX with phenylpyruvate (of which a small proportion is α-hydroxycinnamic acid which closely resembles cinnamic acid - a model substrate). Incubation with phenylpyruvate lead to an altered UV-Vis spectrum and reversible enzyme inhibition. The crystal structure of AnFdc1UbiX with phenylpyruvate revealed a bond between C1’ of prFMNiminium and a phenylacetaldehyde adduct – a species that can be formed by decarboxylation of α-hydroxycinnamic acid and tautomerization of the α-hydroxystyrene prFMNiminium adduct. This observation confirmed that it is the prFMNiminium that is the catalytically relevant cofactor.

References

Illustrations

Worked examples

Example 1 — a first encounter with Prenylated flavin mononucleotide

Start with the simplest possible case. Write down what Prenylated flavin mononucleotide claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, 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 Prenylated flavin mononucleotide 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 Prenylated flavin mononucleotide 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 Prenylated flavin mononucleotide

In research: Prenylated flavin mononucleotide appears in chemistry 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 Prenylated flavin mononucleotide 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: Prenylated flavin mononucleotide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cofactors, Flavins, Heterocyclic compounds with 4 rings, so understanding it makes those chapters shorter.
In everyday life: Look for Prenylated flavin mononucleotide 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 Prenylated flavin mononucleotide in 20 minutes

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Frequently asked questions

What is Prenylated flavin mononucleotide in simple terms?

Why does Prenylated flavin mononucleotide matter?

Because it connects several chemistry 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 Prenylated flavin mononucleotide?

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 Prenylated flavin mononucleotide.