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Oxalyl-CoA decarboxylase

Oxalyl-CoA decarboxylase 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 Oxalyl-CoA decarboxylase rather than just read about it. In short: The enzyme oxalyl-CoA decarboxylase (OXC) (EC 4.1.1.8), primarily produced by the gastrointestinal bacterium Oxalobacter formigenes, catalyzes the chemical reaction oxalyl-CoA ⇌ {\displaystyle \rightleftharpoons } formyl-CoA + CO2 OXC belongs to the family of lyases, specifically the carboxy-lyases (decarboxylases), which cleave carbon-carbon bonds. The systematic name of this enzyme class is oxalyl-CoA carboxy-lyas…

Oxalyl-CoA decarboxylase — main illustration
Oxalyl-CoA decarboxylase — illustration

Key takeaways

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

Reference excerpt

The enzyme oxalyl-CoA decarboxylase (OXC) (EC 4.1.1.8), primarily produced by the gastrointestinal bacterium Oxalobacter formigenes, catalyzes the chemical reaction

oxalyl-CoA ⇌ {\displaystyle \rightleftharpoons } formyl-CoA + CO2 OXC belongs to the family of lyases, specifically the carboxy-lyases (decarboxylases), which cleave carbon-carbon bonds. The systematic name of this enzyme class is oxalyl-CoA carboxy-lyase (formyl-CoA-forming). Other names in common use include oxalyl coenzyme A decarboxylase, and oxalyl-CoA carboxy-lyase. This enzyme participates in glyoxylate and dicarboxylate metabolism. It employs one cofactor, thiamin diphosphate (TPP), and plays a key role in catabolism of oxalate, a highly toxic compound that is a product of the oxidation of carbohydrates in many bacteria and plants. Oxalyl-CoA decarboxylase is extremely important for the elimination of ingested oxalates found in human foodstuffs like coffee, tea, and chocolate, and the ingestion of such foods in the absence of Oxalobacter formigenes in the gut can result in kidney disease or even death as a result of oxalate poisoning.

Evolution Oxalyl-CoA decarboxylase is hypothesized to be evolutionarily related to acetolactate synthase, a TPP-dependent enzyme responsible for the biosynthesis of branched chain amino acids in certain organisms. Sequence alignments between the two enzymes support this claim, as do the presence of vestigial FAD-binding pockets that play no role in either enzyme's catalytic activity. The binding of FAD at this site in acetolactate synthase and the binding of ADP at a cognate site in OXC are thought to play roles in the stabilization of the tertiary structures of the proteins. No FAD binding is observed in oxalyl-CoA decarboxylase, but an excess of coenzyme A in the crystal structure has led to the hypothesis that the binding site was co-opted during OXC evolution to bind the CoA moiety of its substrate. Despite their similarities, only oxalyl-CoA decarboxylase is necessary for the formation of ATP in Oxalobacter formigenes, and exogenous ADP has been demonstrated to increase the decarboxylase activity of OXC, but not acetolactate synthase.

Reaction mechanism

A key feature of the cofactor TPP is the relatively acidic proton bound to the carbon atom between the nitrogen and sulfur in the thiazole ring, which has a pKa near 10. This carbon center ionizes to form a carbanion, which adds to the carbonyl group of oxalyl-CoA. This addition is followed by the decarboxylation of oxalyl-CoA, and then the oxidation and removal of formyl-CoA to regenerate the carbanion form of TPP. While the reaction mechanism is shared with other TPP-dependent enzymes, the residues found in the active site of OXC are unique, which has raised questions about whether TDP must be deprotonated by a basic amino acid at a second site away from the carbanion-forming site to activate the cofactor.

Structure

Oxalyl-CoA decarboxylase is tetrameric, and each monomer consists of three α/β-type domains. The thiamine diphosphate-binding site rests on the subunit-subunit interface between two of the domains, which is commonly seen in its class of enzymes. Oxalyl-CoA decarboxylase is structurally homologous to acetolactate synthase found in plants and other microorganisms, but OXC binds ADP in a region that is similar to the FAD-binding site in acetolactate synthase.

See also Oxalate—CoA ligase Formyl-CoA transferase Oxalate CoA-transferase

References

Illustrations

Oxalyl-CoA decarboxylase illustration
Oxalyl-CoA decarboxylase illustration
Oxalyl-CoA decarboxylase: Simplified reaction mechanism of oxalyl-CoA decarboxylase. The unlabeled base is believed to be the 4'-imino group of TPP.
Simplified reaction mechanism of oxalyl-CoA decarboxylase. The unlabeled base is believed to be the 4'-imino group of TPP.
Oxalyl-CoA decarboxylase: Two colorizations of the dimeric substructure of the enzyme. Left side distinguishes the enzyme's secondary structures and right side distinguishes the two monomers. Derived from PDB: 2JI6​
Two colorizations of the dimeric substructure of the enzyme. Left side distinguishes the enzyme's secondary structures and right side distinguishes the two monomers. Derived from PDB: 2JI6​

Worked examples

Example 1 — a first encounter with Oxalyl-CoA decarboxylase

Start with the simplest possible case. Write down what Oxalyl-CoA decarboxylase 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 Oxalyl-CoA decarboxylase 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 Oxalyl-CoA decarboxylase 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 Oxalyl-CoA decarboxylase

In research
Oxalyl-CoA decarboxylase 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 Oxalyl-CoA decarboxylase 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
Oxalyl-CoA decarboxylase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 4.1.1, Enzymes of known structure, Thiamine enzymes, so understanding it makes those chapters shorter.
In everyday life
Look for Oxalyl-CoA decarboxylase 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 Oxalyl-CoA decarboxylase in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Oxalyl-CoA decarboxylase means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Oxalyl-CoA decarboxylase out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Oxalyl-CoA decarboxylase in simple terms?

The enzyme oxalyl-CoA decarboxylase (OXC) (EC 4.1.1.8), primarily produced by the gastrointestinal bacterium Oxalobacter formigenes, catalyzes the chemical reaction oxalyl-CoA ⇌ {\displaystyle \rightleftharpoons } formyl-CoA + CO2 OXC belongs to the family of lyases, specifically the carboxy-lyases…

Why does Oxalyl-CoA decarboxylase 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 Oxalyl-CoA decarboxylase?

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 Oxalyl-CoA decarboxylase.

Tags

  • EC 4.1.1
  • Enzymes of known structure
  • Thiamine enzymes

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