engineering

Xenobiotic-transporting ATPase

Xenobiotic-transporting ATPase 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 Xenobiotic-transporting ATPase rather than just read about it. In short: In enzymology, a xenobiotic-transporting ATPase (EC 3.6.3.44) is an enzyme that catalyzes the chemical reaction ATP + H2O + xenobioticin ⇌ {\displaystyle \rightleftharpoons } ADP + phosphate + xenobioticout The 3 substrates of this enzyme are ATP, H2O, and xenobiotic, whereas its 3 products are ADP, phosphate, and xenobiotic. This enzyme belongs to the family of hydrolases, specifically those acting on acid anhydrid…

Key takeaways

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

Reference excerpt

In enzymology, a xenobiotic-transporting ATPase (EC 3.6.3.44) is an enzyme that catalyzes the chemical reaction

ATP + H2O + xenobioticin ⇌ {\displaystyle \rightleftharpoons } ADP + phosphate + xenobioticout The 3 substrates of this enzyme are ATP, H2O, and xenobiotic, whereas its 3 products are ADP, phosphate, and xenobiotic. This enzyme belongs to the family of hydrolases, specifically those acting on acid anhydrides to catalyse transmembrane movement of substances. The systematic name of this enzyme class is ATP phosphohydrolase (xenobiotic-exporting). Other names in common use include multidrug-resistance protein, MDR protein, P-glycoprotein, pleiotropic-drug-resistance protein, PDR protein, steroid-transporting ATPase, and ATP phosphohydrolase (steroid-exporting).

References

Bellamy WT (1996). "P-glycoproteins and multidrug resistance". Annu. Rev. Pharmacol. Toxicol. 36: 161–83. doi:10.1146/annurev.pa.36.040196.001113. PMID 8725386. Oude Elferink RP; Ottenhoff, R; Van Wijland, MJ; Van Nieuwkerk, C; Groen, AK; Oude Elferink, RP (1996). "Influence of bile salts on hepatic mdr2 P-glycoprotein expression". Adv. Enzyme. Regul. 36: 351–63. doi:10.1016/0065-2571(95)00019-4. PMID 8869755. Keppler D, Konig J, Buchler M (1997). "The canalicular multidrug resistance protein, cMRP/MRP2, a novel conjugate export pump expressed in the apical membrane of hepatocytes". Adv. Enzyme. Regul. 37: 321–33. doi:10.1016/S0065-2571(96)00013-1. PMID 9381978. Loe DW, Deeley RG, Cole SP (1998). "Characterization of vincristine transport by the M(r) 190,000 multidrug resistance protein (MRP): evidence for cotransport with reduced glutathione". Cancer Res. 58 (22): 5130–6. PMID 9823323. van Veen HW, Konings WN (1998). "The ABC family of multidrug transporters in microorganisms". Biochim. Biophys. Acta. 1365 (1–2): 31–6. doi:10.1016/S0005-2728(98)00039-5. PMID 9693718. Griffiths JK; Sansom CE. "The Transporter Factsbook, Academic Press, San Diego, 1998". {{cite journal}}: Cite journal requires |journal= (help) Prasad R, De Wergifosse P, Goffeau A, Balzi E (1995). "Molecular cloning and characterization of a novel gene of Candida albicans, CDR1, conferring multiple resistance to drugs and antifungals". Curr. Genet. 27 (4): 320–9. doi:10.1007/BF00352101. PMID 7614555. S2CID 29807003. Yamasaki M; Taguchi, Y; Arioka, M; Kadokura, H; Takatsuki, A; Yoda, K; Yamasaki, M (1995). "bfr1+, a novel gene of Schizosaccharomyces pombe which confers brefeldin A resistance, is structurally related to the ATP-binding cassette superfamily". J. Bacteriol. 177 (6): 1536–43. doi:10.1128/jb.177.6.1536-1543.1995. PMC 176770. PMID 7883711. Mahe Y, Lemoine Y, Kuchler K (1996). "The ATP binding cassette transporters Pdr5 and Snq2 of Saccharomyces cerevisiae can mediate transport of steroids in vivo". J. Biol. Chem. 271 (41): 25167–72. doi:10.1074/jbc.271.41.25167. PMID 8810273.

Worked examples

Example 1 — a first encounter with Xenobiotic-transporting ATPase

Start with the simplest possible case. Write down what Xenobiotic-transporting ATPase 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 Xenobiotic-transporting ATPase 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 Xenobiotic-transporting ATPase 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 Xenobiotic-transporting ATPase

In research: Xenobiotic-transporting ATPase 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 Xenobiotic-transporting ATPase 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: Xenobiotic-transporting ATPase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 3.6.3, EC 3.6 stubs, Enzymes of unknown structure, so understanding it makes those chapters shorter.
In everyday life: Look for Xenobiotic-transporting ATPase 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 Xenobiotic-transporting ATPase in 20 minutes

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

Frequently asked questions

What is Xenobiotic-transporting ATPase in simple terms?

In enzymology, a xenobiotic-transporting ATPase (EC 3.6.3.44) is an enzyme that catalyzes the chemical reaction ATP + H2O + xenobioticin ⇌ {\displaystyle \rightleftharpoons } ADP + phosphate + xenobioticout The 3 substrates of this enzyme are ATP, H2O, and xenobiotic, whereas its 3 products are ADP…

Why does Xenobiotic-transporting ATPase 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 Xenobiotic-transporting ATPase?

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 Xenobiotic-transporting ATPase.