biology

Methanopyrus

Methanopyrus is a biology 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 Methanopyrus rather than just read about it. In short: Methanopyrus is a genus of methanogen, with a single described species, Methanopyrus kandleri (type strain AV19). It is a rod-shaped hyperthermophile, discovered on the wall of a black smoker from the Gulf of California at a depth of 2,000 m, at temperatures of 84–110 °C.

Key takeaways

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

Reference excerpt

Methanopyrus is a genus of methanogen, with a single described species, Methanopyrus kandleri (type strain AV19). It is a rod-shaped hyperthermophile, discovered on the wall of a black smoker from the Gulf of California at a depth of 2,000 m, at temperatures of 84–110 °C. Strain 116 was discovered in black smoker fluid of the Kairei hydrothermal field; it can survive and reproduce at 122 °C. M. kandleri also requires a high ionic concentration (>1 M) in order for growth and cellular activity. Due to the species' high resilience and extreme environment, M. kandleri is also classified as an extremophile. It lives in a hydrogen–carbon dioxide rich environment, and like other methanogens reduces the latter to methane. It is placed among the phylum Methanobacteriota forming its own class.

Microbiological characteristics

Morphology Methanopyrus kandleri is a rod-shaped methanogen with an approximate length of 2–14 μm and diameter of 0.5 μm. The cellular membrane of M. kandleri is unique as it consists of terpenoid lipids, believed to be one of the most primitive lipids and a predecessor to phytanyl di-ethers found in later archaea. Terpenoid lipids are a group of lipids containing cholesterol, hopanoids, carotenoid, phytane, and bisphytane. Although terpenoids are the main component of the membrane in M. kandleri, they are more of a supporting structure in eukaryote and bacteria. M. kandleri is motile via polar flagella tufts. Methanopyrus kandleri has a high concentration of cyclic 2,3-diphosphoglycerate. This compound is often found in hyperthermophiles, helping to prevent protein denaturation in high temperatures. The increased concentration of cyclic 2,3-diphosphoglycerate protects the methanogen, helping it survive in an environment that many other organisms could not. Beyond this compound to help protect the proteins, M. kandleri also has a high salt concentration inside its membrane. This increased concentration of salt helps with enzyme stability and promotes activity of the enzymes at higher temperatures.

Metabolism As a methanogen, M. kandleri utilizes hydrogen as an electron source and reduces carbon dioxide from the environment into methane, a process known as methanogenesis. M. kandleri is a chemolithoautotrophic, obligate anaerobe, i.e. never uses oxygen as a final electron acceptor and cannot tolerate its presence.

Habitat Cultures of M. kandleri have been isolated from various submarine hydrothermal vents from locations in the Gulf of California, Central Indian Ridge, Mid-Atlantic Ridge, and Iceland. The species was first discovered on the wall of a black smoker from the Gulf of California at a depth of 2,000 m, at temperatures of 84–110 °C. M. kandleri can survive up to temperatures of 122 °C, although optimal growth has been determined to be at 98 °C. High internal ionic cell concentrations (>1 M) are required for cell growth and activity. Due to the extremity of environment that M. kandleri resides in, it is hypothesized that further phylogenetic isolation has occurred due to the exclusivity of the species niche.

Genomic properties The complete genome of Methanopyrus kandleri was sequenced by researchers at Fidelity Systems. It was determined to be a GC-rich genome containing 1,694,969 nucleotides of which about 62.1% is guanine or cytosine. The single circular chromosome possesses 1,691 protein-coding genes and 39 RNA genes. The species also possesses a large number of orphan genes, possibly through viral gene transfer.

Future research Methanopyrus kandleri is also the only species known to have topoisomerase V. Topoisomerase V allows for M. kandleri to survive in such high temperatures and helps to relax both positively and negatively supercoiled DNA . Topoisomerase V is a unique enzyme because it possesses both topoisomerase and DNA repair activities, specifically multiple DNA repair sites that can act independently of each other even if there is damage to one of the sites on the DNA. Although topoisomerase V is useful in this case, finding other hyperthermophiles that have topoisomerase V has proven difficult. This lack of topoisomerase V in other archaeon has led researchers to believe that the origin of the enzyme in M. kandleri is a result of viral gene transfer and the unusual amount of orphan genes in the species provides evidence for this theory. Additionally, the evolved cellular responses in M. kandleri due to its extreme environment has been another subject of research, as scientists look to apply the resilient enzymatic processes for industrial purposes.

Illustrations

Worked examples

Example 1 — a first encounter with Methanopyrus

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

In research: Methanopyrus appears in biology 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 Methanopyrus 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: Methanopyrus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Archaea genera, Marine fauna of the Gulf of California, Methanobacteriati, so understanding it makes those chapters shorter.
In everyday life: Look for Methanopyrus 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 Methanopyrus in 20 minutes

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

Frequently asked questions

What is Methanopyrus in simple terms?

Why does Methanopyrus matter?

Because it connects several biology 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 Methanopyrus?

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 Methanopyrus.