engineering

Perchlorate reductase

Perchlorate reductase 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 Perchlorate reductase rather than just read about it. In short: Perchlorate reductase is an enzyme that catalyzes the chemical reactions: ClO4− + 2 AH2 ⇌ {\displaystyle \rightleftharpoons } ClO2− + 2 A + 2 H2O and ClO3− + AH2 ⇌ {\displaystyle \rightleftharpoons } ClO2− + A + H2O Thus, the substrates of this enzyme are a reduced electron acceptor (denoted AH2) and either chlorate or perchlorate, sometimes collectively denoted as (per)chlorate. The products are chlorite, an oxidiz…

Key takeaways

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

Reference excerpt

Perchlorate reductase is an enzyme that catalyzes the chemical reactions:

ClO4− + 2 AH2 ⇌ {\displaystyle \rightleftharpoons } ClO2− + 2 A + 2 H2O and

ClO3− + AH2 ⇌ {\displaystyle \rightleftharpoons } ClO2− + A + H2O Thus, the substrates of this enzyme are a reduced electron acceptor (denoted AH2) and either chlorate or perchlorate, sometimes collectively denoted as (per)chlorate. The products are chlorite, an oxidized electron acceptor (denoted A), and water. It is closely related to the enzyme chlorate reductase, but is distinguished by its ability to reduce both perchlorate and chlorate, whereas chlorate reductase only acts on chlorate. Perchlorate reductase and chlorate reductase are closely related but form genetically distinct clades. As of February 2023, perchlorate reductase has not been assigned a specific Enzyme Commission number, but along with chlorate reductase (EC 1.97.1.1), it would presumably be a member of the EC 1.97.1.- oxidoreductase subclass. Some databases, including BRENDA, currently combine perchlorate reductase and chlorate reductase listings.

Structure Perchlorate reductase is usually encoded as a combination of four genes, denoted pcrABCD. The active subunits are pcrA and pcrB which form a periplasmic dimer similar to the active complex in nitrate reductase. pcrC is a believed to be a c-type cytochrome that connects the AB complex to the membrane and allows for electron shuttling. The function of pcrD is uncertain, but may encode a molybdenum-containing chaperone protein specific to assembling the pcrABC system. All known functional perchlorate reductase enzymes include genetically similar versions of pcrABCD except for the Campylobacterota Arcobacter strain CAB, which lacks a traditional pcrC and appears to have replaced it with an unrelated Campylobacterota cytochrome. All characterized organisms that encode perchlorate reductase also have the enzyme chlorite dismutase, which reduces the chlorite produced by perchlorate reductase, and prevents this reactive compound from accumulating to toxic levels. The pcrABCD and chlorite dismutase genes are typically located together in the bacterial genome.

References

Literature Benedict C. Okekea; William T. Frankenberger Jr (2003). "Molecular analysis of a perchlorate reductase from a perchlorate-respiring bacterium Perc1ace". Microbiological Research. 158 (4): 337–344. doi:10.1078/0944-5013-00213. PMID 14717455. Servé W. M. Kengen; Geoffrey B. Rikken; Wilfred R. Hagen; Cees G. van Ginkel; Alfons J. M. Stams (November 1999). "Purification and Characterization of (Per)Chlorate Reductase from the Chlorate-Respiring Strain GR-1". J. Bacteriol. 181 (21): 6706–6711. doi:10.1128/JB.181.21.6706-6711.1999. PMC 94135. PMID 10542172.

Worked examples

Example 1 — a first encounter with Perchlorate reductase

Start with the simplest possible case. Write down what Perchlorate reductase 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 Perchlorate reductase 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 Perchlorate reductase 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 Perchlorate reductase

In research: Perchlorate reductase 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 Perchlorate reductase 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: Perchlorate reductase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 1.97.1, Enzymes of known structure, so understanding it makes those chapters shorter.
In everyday life: Look for Perchlorate reductase 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 Perchlorate reductase in 20 minutes

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

Frequently asked questions

What is Perchlorate reductase in simple terms?

Perchlorate reductase is an enzyme that catalyzes the chemical reactions: ClO4− + 2 AH2 ⇌ {\displaystyle \rightleftharpoons } ClO2− + 2 A + 2 H2O and ClO3− + AH2 ⇌ {\displaystyle \rightleftharpoons } ClO2− + A + H2O Thus, the substrates of this enzyme are a reduced electron acceptor (denoted AH2) a…

Why does Perchlorate reductase 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 Perchlorate reductase?

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 Perchlorate reductase.